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>> David: All right.

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We are back.

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This is week 12.

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So this is the end.

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So nice to see so
many of you again.

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We will adjourn ultimately to
cake in the pub downstairs,

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but what I thought I'd
do is begin us today

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with a little something some
of your teaching fellows made.

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First, a little reminder

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as to what inspired
this particular clip.

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So, you'll recall this
painful experience

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from a few weeks prior.

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So we'll just do a
minute or so of this.

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I'm sorry.

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[Laughter]

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>> Hey. Welcome to the party.

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The four of us along
with [inaudible]

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and you are launching
Windows 7 Ultimate Software.

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So, you know what?

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Let's take a minute or so to
tell you about how great it is

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to host a launch party.

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You can use House Party Tools
to build your guest list.

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Upload your pictures, which
is [inaudible], right?

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Right? [Laughter] And you
can even get a fun pack.

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Though you're in your own home,
you'll be able to participate

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with others in this exciting
event around the world.

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>> In a lot of ways,
just throwing a party

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with Windows 7 as
an honored guest.

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>> David: That sort
of says it all.

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So, as you know, the
CS50 Fair is coming up,

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and so to get folks
excited about this,

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a few of our staff decided

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to put the following
together for you.

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It's about 6 minutes long.

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Here we go.

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[ Pause ]

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>> [Laughter] [Background noise]

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Oh hi. Welcome to the party.

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[Inaudible] launching
[inaudible] 2009 edition.

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Let's take a minute or so
to tell you how big it is

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to be part of the fair.

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You can use the [inaudible]
website to check the guest list

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and [inaudible] to host your
website which is his favorite.

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>> It's my favorite.

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[Laughter]

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>> And you can even
get a stress ball.

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[ Inaudible ]

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>> You know, in a lot of ways,

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it's just like throwing
a [inaudible] party

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with CS50 as our honored guest.

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Sounds easy.

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[Background conversation]
And it is.

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We thought you'd probably
need to know to get ready,

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and how some students will want

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[ inaudible] to flow.

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>> Now the four of us
did our presentations

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in past years [background
conversation].

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You know, tried everything out.

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So we thought we'd give
you some pointers of how

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to make your fun project
presentation really, really fun.

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>> Now the first thing
you're going to want

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to do is finish your project.

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>> [Laughter] Duh!

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>> Make sure you do this at
least a day before coming

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to the fair, preferably
by [inaudible] 11 am.

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Talk to your TF's, us or
consult the bulletin board

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if you have any questions.

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You've got a play with your
final project before actually

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coming to the fair.

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>> Second, look at the
list of projects that you

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and your friends can try at your
CS50 fair and visit the ones

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that seem most interesting
to you.

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>> On [inaudible] a list of
all final projects at the fair

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and then the [inaudible] set
of specs [inaudible] that sort

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of tells you at the time
what you'll be needing

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for your presentation.

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>> Hey, again, you don't need

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to do all the things
specified in the project specs.

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You can just choose your
favorites and try them out.

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>> [Inaudible]

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>> Yeah, for the first part of
the fair, we let the guests come

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in and they just came in
and kind of drink and snack,

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just mingled around
for a little bit just

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like they would at any party.

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[Background conversation]
Then they gathered around,

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and I was able to show my
project to whover came by.

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>> Exactly.

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I just gave an overview
of how my project worked,

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and it only took
me a minute or two,

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and you know what was great?

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It was totally informal, and
everyone was just crowded

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around the table, and
after my overview,

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I went straight to an activity.

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>> Oh. You went to an activity?

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>> Well I just let everyone fool

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around with my project
for a while.

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>> Whoa.

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>> [Laughter] I did the same.

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>> And then we started an
activity a minute or two later.

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>> Well, either case
works, right?

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You just have to figure
out what your guests want

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and play it by ear.

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>> We each did a demo or two.

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>> I did three.

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[Background noise] The
demos go for a brief time.

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Every once in awhile when
other people come by.

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As for the rest of the party,
you just let your guests play

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around for a while, and your
guests may have some questions,

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or you may want to
show them some things,

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but it's completely informal.

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>> Informal, yeah.

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Again, there are several
ways to [inaudible] your time

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at the CS50 fair, but in the
end, it's all up to you..

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>> You know, the four of
us learned a lot of things

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to make our part of
the fair a lot of fun.

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>> Yeah, here's mine.

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Make the thing you're
demonstrating personal

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to the person you're showing,

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like the way I helped someone
register for a user name

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to make an order on my online
dining hall ordering site

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webpage program application.

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>> Or how I let students
arrange their own custom made

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[inaudible] on my project and
gave them [inaudible] user ids.

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>> Ok, on a more serious note.

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[Laughter] [Inaudible]
your demos

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and prepare a little information
you want to talk about

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and make sure you have all
the equipment you need.

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>> Sure. You have to
have your computer

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to show off your project.

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[Laughter]

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>> Of course.

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>> In any case, none
of this is too hard.

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You just need to make sure
that you're ready to go

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when you're guests arrive.

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>> And, hey, help
me to remember,

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I'm not at a salesman
at this party.

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I'm not supposed to be
a total expert either.

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I mean, this is a brand
new implementation,

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and part of the fun of the CS50
fair is seeing what you already

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know and what you
can figure out.

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It's so simple, anyone
can do it.

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>> And that is one of the
great things about being a part

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of the fair that's
amongst your peers.

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>> I think the greatest thing is
to be totally creative and open

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to your project and how
you present it at the fair.

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After all, it is your fair.

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>> Can you guys believe

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that David [inaudible] launched
the CS50 fair in our hands?

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[Laughter] Is that crazy?

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>> Man, you be involved.

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>> Oh.

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>> I mean, it does make
total sense, right?

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CS50's all about the students
and the community, and it's all

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about thinking about every
day problems in new ways

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and making new things possible.

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>> This really is our fair.

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>> Hmm. You're right.

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>> So it ought to be a party.

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Have fun out there.

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>> Cheers.

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>> Oh, I'm hungry.

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Let's eat.

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[Background noise]

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>> This was CS50.

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>> No TF's were harmed
during the production

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of this movie except me, who
was just starved to death.

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[ Inaudible ]

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[Applause]

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>> David: So actually
just notice that Matt did

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like three wardrobe
changes during that film.

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But so the CS50 Fair
is indeed coming up.

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A little, even more,
just as funny

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as that was the photo shoot
that went on afterward.

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So we have a lot of
clips of like this year,

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and perhaps something
will end up floating

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around on You-tube
at some point.

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Before long.

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But as for this thing,
what to expect.

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So the week of the fair, you
guys will all get an email

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with some additional
instruction,

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so if you're wondering
what do I do on that day,

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just check your email
on Monday, December 7.

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The fair, again, is on
Tuesday, December 8,

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and essentially it
will go as follows.

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You will enter Northwest
Science,

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which is the relatively
new science building

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down the street.

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Roughly 900 people attended the
fair last year including last

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year's students.

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You will be plummeted
with CS50 stress balls

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as the TF's greet
you as you come in.

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Little things like
this, and [inaudible],

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and you'll be handed a program,

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and with the things
you are handed,

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you will be have
instructions, and essentially

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out of the 300+ students
in the class,

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about half of you will
be directed to show

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up at the beginning of the
fair, which is going to be 1:00,

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and then half of you will
be instructed to show

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up roughly half way
during the fair,

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so there'll be intentionally
a bit of overlap,

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and there will be essentially
a scene change where all

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of you guys show up with your
laptop and projects on it

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for exhibition, and then
roughly half way through,

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the other people
will take your place,

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and it was actually really
quite fun as you may have seen

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from the Facebook videos online,

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and hopefully this little teaser
today will get you all the

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more excited.

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Coming at the end of lecture
are two cakes this time,

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both chocolate and vanilla,
so do stick around underneath.

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We have decorated Happy Cat
in the CS50 garb of this year.

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That's at store.CS50.net,
and let me go ahead

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and do the sentimental
part rather

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than leaving that for the end.

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So, a huge thanks to
the staff of this course

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00:09:18,836 --> 00:09:23,206
over the past several months
who have really made this all

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of the magic in this
course happen, right?

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So I may be the talking face at
the front of lecture a couple

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of times per week, but it's the
60+ undergraduates and graduates

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and alumni who have
really made this course run

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so smoothly behind the scenes.

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So even though just a few
of them don't have conflicts

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with class and the rest of them
are cutting the cake downstairs

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at the moment, could
we please at least

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on camera give them a
huge round of applause.

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[ Applause ]

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If interested in joining
precisely that team,

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go to CS50.net/apply, and the
roles we're looking for, again,

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are teaching fellows who'd
lead sections, who grade,

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who hold office hours, and
really get to know a group

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of students over the course
of the semester, CA's,

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who are alumni who hold 2
hours of office hours per week,

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pretty much self scheduled
by a Google calendar,

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and that's a way of
sort of keeping one foot

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in CS50 while still
focusing, if you so choose,

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on other extracurriculars,
and then graders, as well.

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I wanted to read a
little excerpt of a couple

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of emails I got, one in February
of 2008 and one in November

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of 2007, and this student wrote
me-I'll read just a couple

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of excerpts here.

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"Hello, David, thank you
very much for your email.

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It really made my long
computer science less boring,

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my long CS-less boring day.

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I was in Model United
Nations conference at McGill

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when I found out about my grade.

247
00:10:48,236 --> 00:10:51,136
I couldn't help but shriek right
in the middle of my committee.

248
00:10:51,346 --> 00:10:52,716
It was a very embarrassing
moment,

249
00:10:52,716 --> 00:10:54,946
and all the other 99
delegates looked at me,

250
00:10:55,086 --> 00:10:56,856
and I simply pretended
that nothing had happened.

251
00:10:57,146 --> 00:11:00,076
Everything about CS50 in my life
involves some kind of drama."

252
00:11:00,416 --> 00:11:01,416
Now a few months prior,

253
00:11:01,416 --> 00:11:04,206
that same student had written
me this note here, and,

254
00:11:04,206 --> 00:11:07,586
incidentally, they approved my
reading excerpts from these,

255
00:11:07,646 --> 00:11:10,416
so don't worry about ever
sending me an email again.

256
00:11:10,656 --> 00:11:11,936
[Laughter] "Hello, David."

257
00:11:12,026 --> 00:11:18,036
Let's see..."After our dinner
yesterday," faculty dinner,

258
00:11:18,106 --> 00:11:20,106
faculty/student dinner,
"I asked myself why I was

259
00:11:20,106 --> 00:11:21,366
about to drop the course."

260
00:11:21,366 --> 00:11:23,116
So this was in the fall of 2007,

261
00:11:23,116 --> 00:11:24,746
"considering how much
I adore the course.

262
00:11:24,796 --> 00:11:25,836
The main reason why I was

263
00:11:25,836 --> 00:11:28,166
about to drop the course
was rather personal,

264
00:11:28,316 --> 00:11:29,746
but here is the entire story."

265
00:11:30,656 --> 00:11:31,316
It's pretty long.

266
00:11:31,576 --> 00:11:33,426
So, excerpts thereof.

267
00:11:33,426 --> 00:11:35,526
"Even though I was always
interested in the material,

268
00:11:35,526 --> 00:11:37,316
around the third week,
right before the midterm,

269
00:11:37,316 --> 00:11:40,286
I felt overwhelmed and exhausted
by the load of work I had to do.

270
00:11:40,496 --> 00:11:43,346
I tried finishing my PS2 on
Wednesday because I was leaving

271
00:11:43,346 --> 00:11:46,036
on Thursday for Columbia for a
Model United Nations conference.

272
00:11:46,036 --> 00:11:47,196
I spent an entire day

273
00:11:47,196 --> 00:11:48,696
in the terminal room
trying to get help.

274
00:11:48,956 --> 00:11:51,686
I hadn't developed the office
hours technique yet back then.

275
00:11:51,926 --> 00:11:55,006
Maybe I was just unlucky,
but I only got helped once,

276
00:11:55,006 --> 00:11:57,076
and the poor TF, overwhelmed
by the number of students

277
00:11:57,076 --> 00:11:59,616
in office hours, could only
talk to me for a few minutes.

278
00:11:59,616 --> 00:12:01,316
I tried the virtual
terminal room that night,

279
00:12:01,316 --> 00:12:04,806
and for some reason, 20 people
were online and around 1:00 am

280
00:12:04,806 --> 00:12:07,316
in the morning I realized
that it was a lost cause,

281
00:12:07,316 --> 00:12:10,356
so I tried doing it on my own,
but somehow I couldn't figure

282
00:12:10,356 --> 00:12:12,236
out a way to make visionaire
[assumed spelling] work!!!

283
00:12:12,236 --> 00:12:17,026
In Columbia, I literally locked
myself in the hotel room to come

284
00:12:17,026 --> 00:12:20,006
up with a logical
solution to my problems,

285
00:12:20,286 --> 00:12:22,936
but it seemed the more I tried,
the more I failed miserably.

286
00:12:23,006 --> 00:12:24,506
I tried virtual office
hours again,

287
00:12:24,506 --> 00:12:26,816
and well the poor TF's again
trying to help two students

288
00:12:26,816 --> 00:12:28,996
at a time, weren't
really able to help me.

289
00:12:28,996 --> 00:12:31,076
Honestly, I was really
frustrated that I needed

290
00:12:31,076 --> 00:12:34,596
so much time to get a
relatively easy pset done,

291
00:12:34,596 --> 00:12:37,116
so I said to myself, if I
can't do the problem sets

292
00:12:37,116 --> 00:12:38,976
in the beginning of the
year, I won't be able

293
00:12:38,976 --> 00:12:40,226
to handle the course."

294
00:12:40,686 --> 00:12:44,246
So, dot, dot, dots, and this,
recall, same student wrote us

295
00:12:44,246 --> 00:12:48,006
at semester's end with a
much more gratified note,

296
00:12:48,316 --> 00:12:50,646
but I wanted to excerpt
one last quote here.

297
00:12:50,646 --> 00:12:51,816
Since I had asked this student

298
00:12:51,816 --> 00:12:52,996
if she could give
me her perspectives

299
00:12:52,996 --> 00:12:54,006
on the course two years ago,

300
00:12:54,006 --> 00:12:57,286
which was the first year
I taught the course...what

301
00:12:57,476 --> 00:12:59,186
suggestions she might
have, and she wrote,

302
00:12:59,416 --> 00:13:01,326
"If the sections could
be designed in such a way

303
00:13:01,326 --> 00:13:03,346
to put all of the less
comfortable students together

304
00:13:03,346 --> 00:13:05,456
in a small section,
it might work better.

305
00:13:05,526 --> 00:13:07,016
I feel that sections
are important

306
00:13:07,016 --> 00:13:08,466
because there you can
ask more questions

307
00:13:08,466 --> 00:13:09,536
without feeling intimidated

308
00:13:09,536 --> 00:13:13,916
by 200 other comp sci experts
looking at you, and once you,

309
00:13:14,036 --> 00:13:16,376
and also once you feel like
you are not the only one,

310
00:13:16,616 --> 00:13:18,256
you feel better about yourself.

311
00:13:18,496 --> 00:13:19,256
Smiley face."

312
00:13:19,526 --> 00:13:22,296
So it was largely the result
of this student having written

313
00:13:22,296 --> 00:13:24,496
and other students having
echoed the same sentiments

314
00:13:24,496 --> 00:13:26,176
that we did introduce last
year these three tracks

315
00:13:26,336 --> 00:13:28,386
for those less and
those more comfortable

316
00:13:28,386 --> 00:13:29,686
and for those somewhere
in between,

317
00:13:29,686 --> 00:13:32,816
and I want to take a moment to
read these excerpts really just

318
00:13:32,816 --> 00:13:35,586
to show you the before and after
because in the course syllabus,

319
00:13:35,586 --> 00:13:37,686
we do make that promise
that what matters

320
00:13:38,156 --> 00:13:40,416
in the course is not so much
where you end up relative

321
00:13:40,416 --> 00:13:43,836
to that CS expert to your right
and the CS expert to your left,

322
00:13:44,056 --> 00:13:45,906
but rather where you end
up relative to yourself,

323
00:13:45,906 --> 00:13:49,196
and week 12, today,
vis-a-vis week zero.

324
00:13:49,446 --> 00:13:52,246
So the students who wrote
me this note is named Jensu

325
00:13:52,246 --> 00:13:54,386
[inaudible] who has been the
course's head teaching fellow

326
00:13:54,386 --> 00:13:56,416
for the past couple of
years, and so I just wanted

327
00:13:56,416 --> 00:13:59,776
to thank her very wholeheartedly
and very sentimentally

328
00:13:59,776 --> 00:14:01,526
for having written this
note and for having done

329
00:14:01,526 --> 00:14:02,726
such a wonderfully

330
00:14:02,946 --> 00:14:05,366
and apparently awkward job
the past couple of years.

331
00:14:05,366 --> 00:14:05,976
So, Jansu.

332
00:14:06,516 --> 00:14:14,136
[ Applause ]

333
00:14:14,636 --> 00:14:18,876
And finally though I do,
finally, though I do love all

334
00:14:18,876 --> 00:14:21,626
of the TF's and CA's equally,
I did want to a moment

335
00:14:21,626 --> 00:14:25,026
to just recognize the boy
who has wardrobed Happy Cat

336
00:14:25,226 --> 00:14:26,256
and of all us this year.

337
00:14:26,316 --> 00:14:29,686
CS50 honestly would not be
as beautiful or as branded

338
00:14:30,356 --> 00:14:32,406
as it has become over
the past two years,

339
00:14:32,406 --> 00:14:34,956
and you've seen perhaps the
limited extent of my web skills,

340
00:14:35,126 --> 00:14:36,556
and it's really thanks to
this fellow, [inaudible],

341
00:14:36,556 --> 00:14:39,526
that the course looks
the way it does.

342
00:14:39,566 --> 00:14:40,976
So a huge round of applause
would be good for him as well.

343
00:14:41,516 --> 00:14:47,816
[ Applause ]

344
00:14:48,316 --> 00:14:50,736
And, lastly, there are many,
many people on this sheet

345
00:14:50,736 --> 00:14:53,576
of paper who are never in front
of the camera but behind it,

346
00:14:53,616 --> 00:14:57,436
but Chris and John and Barry,
the team downstairs, many,

347
00:14:57,436 --> 00:15:00,496
many thanks for having made
this semester so flawless,

348
00:15:00,676 --> 00:15:03,266
and I apologize myself for
any technical [inaudible].

349
00:15:03,336 --> 00:15:05,886
They have been have been
mine and never the crew

350
00:15:05,886 --> 00:15:06,976
that supports us, so thank you.

351
00:15:07,516 --> 00:15:11,826
[ Applause ]

352
00:15:12,326 --> 00:15:15,316
So, now, it's all
about you guys.

353
00:15:15,776 --> 00:15:18,486
So we look back at
several problem sets,

354
00:15:18,486 --> 00:15:20,676
and there were various
fun competitive aspects

355
00:15:20,676 --> 00:15:23,036
and various interesting
submissions over time,

356
00:15:23,036 --> 00:15:25,266
and we wanted to take a
moment to recognize a few

357
00:15:25,266 --> 00:15:26,466
of the submissions that had come

358
00:15:26,466 --> 00:15:27,876
in over the course
of the semester.

359
00:15:28,456 --> 00:15:31,346
This is not to say that these
were necessarily the best.

360
00:15:31,346 --> 00:15:32,916
This is not to say
these were the worst,

361
00:15:32,916 --> 00:15:35,776
but they certainly stood out
in the staff's mind for better

362
00:15:35,776 --> 00:15:37,916
or for worse, and
today for the better.

363
00:15:37,916 --> 00:15:39,216
So we wanted to take a moment

364
00:15:39,536 --> 00:15:42,616
to recognize this scratch
project from many weeks ago.

365
00:15:42,616 --> 00:15:45,206
None of these students were
among those more comfortable,

366
00:15:45,206 --> 00:15:47,836
but what we went ahead
and did was dig up a few.

367
00:15:48,336 --> 00:15:50,906
This one here was
one of our favorites,

368
00:15:51,496 --> 00:15:52,886
and actually let me
go ahead and pull

369
00:15:52,886 --> 00:15:54,046
up the client's side version.

370
00:15:54,046 --> 00:15:57,136
As some of you may recall,
things seem to run better

371
00:15:57,306 --> 00:16:00,506
on the local client,
and is Tom Rice here?

372
00:16:00,606 --> 00:16:03,806
Tom? So this is Tom
Rice's Space Invaders,

373
00:16:03,806 --> 00:16:06,096
and if we can invite him up for
a second, and then would someone

374
00:16:06,186 --> 00:16:08,386
like to play Space
Invaders up here,

375
00:16:08,606 --> 00:16:10,206
albeit on camera,
for just a moment.

376
00:16:10,986 --> 00:16:13,146
It's your last chance
to volunteer.

377
00:16:14,156 --> 00:16:16,096
Tom, pick someone who
you think would love

378
00:16:16,096 --> 00:16:17,286
to come up on stage with you.

379
00:16:17,286 --> 00:16:24,206
[Background conversation]
All right, come on down here.

380
00:16:25,056 --> 00:16:30,966
Tom? If you would like to come
up here and explain, if need be,

381
00:16:30,966 --> 00:16:32,376
exactly how this is played.

382
00:16:32,376 --> 00:16:33,986
We thought we would feature

383
00:16:33,986 --> 00:16:37,046
for just a moment your
version of Space Invaders.

384
00:16:41,516 --> 00:16:44,006
>> Tom: [Pause] Hi,
what's your name?

385
00:16:44,006 --> 00:16:44,176
>> Art: Art.

386
00:16:44,706 --> 00:16:45,926
>> Tom: Hi, I'm Tom.

387
00:16:45,926 --> 00:16:48,436
Uh, ok. There's a microphone.

388
00:16:48,436 --> 00:16:50,586
So the controls are right here.

389
00:16:50,586 --> 00:16:51,236
[Laughter] You move.

390
00:16:54,156 --> 00:16:55,566
Shoot to start.

391
00:16:55,566 --> 00:16:55,656
>> Art: Ok.

392
00:16:55,656 --> 00:16:59,466
>> Tom: We'll have to
click the green flag first.

393
00:17:00,136 --> 00:17:03,046
[Pause] The sound on.

394
00:17:04,156 --> 00:17:05,976
You have sound on?

395
00:17:06,356 --> 00:17:06,686
>> [Background noise] Yes.

396
00:17:06,686 --> 00:17:12,126
>> Tom: You should
shoot at the aliens.

397
00:17:12,366 --> 00:17:14,186
[Laughter] And don't
let them hit you.

398
00:17:14,186 --> 00:17:16,956
You're going to hold
down the space bar

399
00:17:17,516 --> 00:17:23,516
[ Music ]

400
00:17:24,016 --> 00:17:30,000
[ Laughter ]

401
00:17:30,156 --> 00:17:30,756
All right.

402
00:17:31,516 --> 00:17:45,516
[ Music ]

403
00:17:46,016 --> 00:17:48,000
[Inaudible]

404
00:17:48,516 --> 00:18:01,586
[ Music ]

405
00:18:02,086 --> 00:18:02,726
>> Now you can shoot
twice as fast.

406
00:18:03,516 --> 00:18:14,546
[ Music ]

407
00:18:15,046 --> 00:18:15,846
You're doing fantastic.

408
00:18:17,516 --> 00:18:25,546
[ Music ]

409
00:18:26,046 --> 00:18:26,576
>> You're doing great.

410
00:18:26,576 --> 00:18:27,936
Everything that's
happening is excellent.

411
00:18:28,516 --> 00:18:37,766
[ Music ]

412
00:18:38,266 --> 00:18:38,976
Two shields left.

413
00:18:39,516 --> 00:18:48,396
[ Applause ]

414
00:18:48,896 --> 00:18:50,606
>> So thank you to
Tom and to Art.

415
00:18:50,606 --> 00:18:52,466
We have a little parting
gift for them today,

416
00:18:52,596 --> 00:18:56,346
so congrats on such
a job well done.

417
00:18:56,346 --> 00:18:57,546
[Background conversation]
Oh, thank you, Art.

418
00:18:57,546 --> 00:19:00,996
All right, so we have two other
scratch projects we wanted

419
00:19:00,996 --> 00:19:02,216
to recognize, and, again,

420
00:19:02,216 --> 00:19:05,256
even though it might not be your
project up here, do think back

421
00:19:05,436 --> 00:19:07,626
to what week zero of
this course was like.

422
00:19:07,826 --> 00:19:09,486
You may recall especially
poignantly

423
00:19:09,486 --> 00:19:12,896
in week one just how damn hard
it was to get a simple, little,

424
00:19:12,996 --> 00:19:17,086
relatively, simply little
pyramid of stars just to appear

425
00:19:17,086 --> 00:19:19,956
on the screen and if you now
think back to pset 7, pset 8,

426
00:19:20,236 --> 00:19:21,746
do appreciate those of you

427
00:19:21,746 --> 00:19:23,966
who feel this way just
how far you've come

428
00:19:23,966 --> 00:19:25,246
in these 12 or so weeks.

429
00:19:25,246 --> 00:19:29,256
So this next one is
actually a bit musical.

430
00:19:29,836 --> 00:19:34,376
In fact, both of these are
musical along these lines.

431
00:19:34,416 --> 00:19:37,716
So this here is Anastasia
Rhoda's [assumed spelling].

432
00:19:37,716 --> 00:19:39,316
Is Anastasia here?

433
00:19:39,786 --> 00:19:41,426
Do you mind coming
up for a second?

434
00:19:41,426 --> 00:19:41,976
Come on up, Anastasia.

435
00:19:42,516 --> 00:19:48,786
[ Applause ]

436
00:19:49,286 --> 00:19:53,156
So this is called
Music Composer.

437
00:19:54,606 --> 00:19:56,626
I'm having some technical
difficulties.

438
00:19:56,626 --> 00:19:58,646
Hello. Let me fix.

439
00:19:58,736 --> 00:19:59,206
There we go.

440
00:19:59,286 --> 00:20:01,246
Ok. Little heavy on
my computer here.

441
00:20:01,746 --> 00:20:04,746
So this I was particularly
struck by.

442
00:20:04,856 --> 00:20:08,596
I don't play piano very
well, but it allows you

443
00:20:08,596 --> 00:20:11,166
to program essentially a
piano by way of some music,

444
00:20:11,166 --> 00:20:12,966
and I'm guessing you
do know some piano?

445
00:20:13,606 --> 00:20:16,256
So this might be a little bit
of pressure here, but would you

446
00:20:16,256 --> 00:20:19,246
like to program us a
little, few chords?

447
00:20:19,766 --> 00:20:21,616
Anastasia, music composer.

448
00:20:22,516 --> 00:20:28,836
[ Background noise ]

449
00:20:29,336 --> 00:20:31,796
[Music] Various letters
represent the musical notes per

450
00:20:31,796 --> 00:20:32,976
the legend on the side.

451
00:20:33,516 --> 00:20:39,516
[ Music ]

452
00:20:40,016 --> 00:20:41,000
[ Background laughter ]

453
00:20:41,516 --> 00:20:55,026
[ Music ]

454
00:20:55,526 --> 00:20:57,776
That's got to be hard under
pressure, so a big round

455
00:20:57,776 --> 00:20:58,916
of applause for Anastasia.

456
00:21:00,536 --> 00:21:00,866
[Applause] Thank you.

457
00:21:04,916 --> 00:21:07,786
In retrospect, I probably
should have told Anastasia

458
00:21:07,786 --> 00:21:09,706
that I would need her to
write a song on stage.

459
00:21:09,706 --> 00:21:12,516
[Laughter] So I hope that
wasn't too much pressure.

460
00:21:12,516 --> 00:21:15,076
And then finally, this one I
actually played with myself.

461
00:21:15,076 --> 00:21:17,686
Another one that's musical in
nature that caught our eye, but,

462
00:21:17,686 --> 00:21:19,416
again, we love them all equally.

463
00:21:20,186 --> 00:21:24,756
This one is by Ivan
Buckov [assumed spelling].

464
00:21:25,366 --> 00:21:26,966
Apologies if I've mispronounced.

465
00:21:26,966 --> 00:21:29,446
Let's let this one
load, too, and this one,

466
00:21:29,446 --> 00:21:30,596
too, can be programmed.

467
00:21:30,596 --> 00:21:31,426
I thought I would go ahead

468
00:21:31,426 --> 00:21:34,096
and do what I did last
night while tinkering.

469
00:21:34,096 --> 00:21:36,006
Go ahead and hit
the green flag here.

470
00:21:36,346 --> 00:21:38,956
I wanted to...so
this is a program

471
00:21:39,206 --> 00:21:41,726
that one run moves this
little bar from left to right,

472
00:21:41,726 --> 00:21:46,146
and anytime it encounters
a note, it plays that note.

473
00:21:46,236 --> 00:21:46,506
[Background music] So each

474
00:21:46,506 --> 00:21:50,476
of these boxes represents
a different note.

475
00:21:50,476 --> 00:21:51,186
It is pretty.

476
00:21:51,266 --> 00:21:54,496
So what I thought I
would see is what CS50,

477
00:21:54,496 --> 00:21:56,406
the musical, sounds like.

478
00:21:56,476 --> 00:22:04,586
[Laughter] So I got to playing
like this, and then I did this.

479
00:22:04,736 --> 00:22:06,156
All right...that's...oops.

480
00:22:06,296 --> 00:22:08,466
I left some space last night,
so let's do this again.

481
00:22:08,786 --> 00:22:09,236
All right.

482
00:22:09,806 --> 00:22:13,356
So that looks like an s kind of.

483
00:22:13,476 --> 00:22:14,246
All right.

484
00:22:14,246 --> 00:22:15,246
Now I did this.

485
00:22:15,706 --> 00:22:16,236
Let's see.

486
00:22:17,126 --> 00:22:23,276
That's a decent 5 and 0 and 0.

487
00:22:23,446 --> 00:22:27,156
And now is Ivan here?

488
00:22:27,156 --> 00:22:29,496
Do you mind joining
us up on stage?

489
00:22:29,646 --> 00:22:30,786
And I'll let you hit play.

490
00:22:30,956 --> 00:22:37,436
[Laughter] So this, too,
is actually very addictive,

491
00:22:37,436 --> 00:22:40,576
and I'm frankly very amazed
when I look at the source code,

492
00:22:40,576 --> 00:22:41,576
the puzzle pieces,
the [inaudible]

493
00:22:41,656 --> 00:22:42,696
that you guys implemented.

494
00:22:42,696 --> 00:22:45,626
There are many that are far
more sophisticated certainly

495
00:22:45,626 --> 00:22:47,226
than what I once did.

496
00:22:47,256 --> 00:22:48,946
So, Ivan, do you want to
explain in just a couple

497
00:22:48,946 --> 00:22:50,326
of words what motivated this

498
00:22:50,326 --> 00:22:51,706
or how it works and
then go to town?

499
00:22:51,976 --> 00:22:55,126
>> Ivan: Well, I'd love to
take full credit for this, but,

500
00:22:55,126 --> 00:22:57,716
unfortunately, I found
it on the Internet.

501
00:22:57,716 --> 00:23:00,466
[Laughter] And it's something
that's called the tone matrix

502
00:23:00,816 --> 00:23:04,286
and tone scratchix, and it's
essentially what you see here,

503
00:23:04,286 --> 00:23:05,366
except it's even bigger.

504
00:23:05,366 --> 00:23:09,316
It's a grid of 16 by 16 of
these little dots It's based

505
00:23:09,316 --> 00:23:13,376
on a pentatonic scale,
so essentially anything,

506
00:23:13,376 --> 00:23:17,026
any combination of squares
that you press are kind

507
00:23:17,026 --> 00:23:19,816
of almost guaranteed
to make a good sound.

508
00:23:19,816 --> 00:23:20,516
I'm not sure if [inaudible].

509
00:23:20,516 --> 00:23:20,583
[Laughter]

510
00:23:20,583 --> 00:23:23,946
>> David: And to be
clear, you found the tool

511
00:23:23,946 --> 00:23:26,246
or the game online, not
this particular scratch

512
00:23:26,246 --> 00:23:26,676
project [inaudible].

513
00:23:26,676 --> 00:23:30,046
[Laughter] All right.

514
00:23:30,046 --> 00:23:35,796
>> Ivan: I thought I'd implement
like a few other functions to it

515
00:23:35,986 --> 00:23:38,886
to make it not just like a
clone of the actual thing,

516
00:23:38,966 --> 00:23:41,946
so I have these other buttons
which [inaudible], reset,

517
00:23:41,946 --> 00:23:45,546
you can change the tempo which
is just changing the speed

518
00:23:45,546 --> 00:23:48,846
of the bars that moves along,
and if you click on sound,

519
00:23:48,846 --> 00:23:51,066
it gives you a different
instrument to play.

520
00:23:51,206 --> 00:23:51,516
>> David: Ooh.

521
00:23:51,516 --> 00:23:51,796
How about that?

522
00:23:51,796 --> 00:23:51,976
Show us.

523
00:23:52,516 --> 00:24:00,546
[ Music ]

524
00:24:01,046 --> 00:24:02,576
David: So that is [laughter]
what 50 sounds like.

525
00:24:02,696 --> 00:24:03,976
Do you want to play with
tempo and sound perhaps?

526
00:24:04,516 --> 00:24:12,516
[ Music ]

527
00:24:13,016 --> 00:24:31,006
[ Background conversation ]

528
00:24:31,506 --> 00:24:49,196
[ Music ]

529
00:24:49,696 --> 00:24:51,756
>> David: Let's end
on a good note.

530
00:24:52,516 --> 00:25:01,386
[ Applause ]

531
00:25:01,886 --> 00:25:02,346
Thank you.

532
00:25:02,486 --> 00:25:03,386
Congrats to Ivan.

533
00:25:03,386 --> 00:25:05,396
It was really quite
fun to play with.

534
00:25:05,396 --> 00:25:07,946
So these are all linked on
today's lecture [inaudible].

535
00:25:07,946 --> 00:25:11,036
Congrats. So that was pset zero.

536
00:25:11,036 --> 00:25:15,946
That then brought us to
problem set 5, which, recall,

537
00:25:15,946 --> 00:25:18,866
involved this guy in many
different places on campus.

538
00:25:18,866 --> 00:25:21,636
So frankly the fact
that, well never mind,

539
00:25:21,636 --> 00:25:23,196
the fact that we own
our own Happy Cat

540
00:25:23,196 --> 00:25:24,756
from icanhascheezburger.com
[assumed spelling],

541
00:25:25,056 --> 00:25:27,006
but in years past, we
simply took photographs

542
00:25:27,006 --> 00:25:30,496
of fairly inanimate things, not
people, but places and things.

543
00:25:30,776 --> 00:25:32,016
This year we decided
to just spice it

544
00:25:32,016 --> 00:25:34,686
up by putting Happy
Cats all around campus

545
00:25:34,686 --> 00:25:36,186
and at the very last minute.

546
00:25:36,186 --> 00:25:38,546
So we gave everyone like 4
weeks to find these photos,

547
00:25:38,816 --> 00:25:43,566
and literally, at like 11:23 pm,
11:49 pm, all of the submissions

548
00:25:43,566 --> 00:25:47,076
from sections started coming
in and so the four sections

549
00:25:47,076 --> 00:25:50,586
who really took this to heart
were these four here, Lee's,

550
00:25:50,586 --> 00:25:54,036
John's, Drew, and Rose's section
which I thought I'd do is pull

551
00:25:54,036 --> 00:25:54,936
up each of these links.

552
00:25:54,936 --> 00:25:57,706
Lee's section was, in
fact, the first to submit,

553
00:25:57,986 --> 00:25:59,896
and almost everyone
got most all of them.

554
00:25:59,896 --> 00:26:01,546
I thought I'd bring
up their album here.

555
00:26:01,936 --> 00:26:03,266
Yea, Lee's section.

556
00:26:04,286 --> 00:26:04,676
[Laughter] Just us.

557
00:26:04,716 --> 00:26:05,166
All right.

558
00:26:06,496 --> 00:26:07,966
[Background noise] There you go.

559
00:26:08,976 --> 00:26:11,916
[Laughter] So you may
recognize...this was actually

560
00:26:11,916 --> 00:26:12,626
fairly common.

561
00:26:12,626 --> 00:26:14,266
Almost all of the
groups submitted a photo

562
00:26:14,266 --> 00:26:15,266
that looked like this.

563
00:26:16,946 --> 00:26:18,726
So this, of course,
was the statue outside

564
00:26:18,726 --> 00:26:20,276
of Boylston Science Center.

565
00:26:20,276 --> 00:26:22,186
It actually looks kind
of cool when looked

566
00:26:22,186 --> 00:26:23,526
at from this angle here.

567
00:26:24,876 --> 00:26:26,046
What else do we have?

568
00:26:26,046 --> 00:26:27,826
This, of course, is a favorite.

569
00:26:27,936 --> 00:26:29,826
All right.

570
00:26:29,896 --> 00:26:32,226
What else do we have here?

571
00:26:34,006 --> 00:26:36,396
You did find the bike racks.

572
00:26:36,486 --> 00:26:37,846
What else did we have here?

573
00:26:38,266 --> 00:26:39,496
Oh, and of course, those of you

574
00:26:39,496 --> 00:26:41,076
who have never seen
Winnie the Pooh.

575
00:26:41,076 --> 00:26:43,206
Pooh seems to disappear
every couple of years,

576
00:26:43,206 --> 00:26:45,736
but his door has been
there for many, many years.

577
00:26:45,736 --> 00:26:48,746
This is a little gem outside

578
00:26:48,746 --> 00:26:50,506
of the science center
by the law school.

579
00:26:50,506 --> 00:26:51,776
So it's a little
dark on this screen,

580
00:26:51,776 --> 00:26:53,496
but that's Pooh's corner there.

581
00:26:53,496 --> 00:26:56,466
So, congrats to Lee's
section, but also congrats

582
00:26:56,606 --> 00:26:57,956
to the other couple of sections.

583
00:26:57,956 --> 00:27:00,156
Let me pull up just a
few of their photos.

584
00:27:00,156 --> 00:27:02,636
This is John's section who
strolled around campus,

585
00:27:03,046 --> 00:27:05,106
similarly found most
of the locations.

586
00:27:05,106 --> 00:27:07,926
Most of these were
taken by, or featuring,

587
00:27:07,926 --> 00:27:08,126
Shea [assumed spelling]

588
00:27:08,126 --> 00:27:12,686
who actually did find the
apple tree in Radcliffe Yard.

589
00:27:12,686 --> 00:27:14,806
I had never know that
there was an apple tree

590
00:27:14,806 --> 00:27:18,386
on Harvard's campus, and that
there is is not necessarily all

591
00:27:18,386 --> 00:27:20,626
that interesting,
but she did find it,

592
00:27:20,626 --> 00:27:23,306
and this is over near the
Admission's office these days,

593
00:27:23,306 --> 00:27:26,156
taken at dark, apparently,
but there are,

594
00:27:26,156 --> 00:27:27,466
or were, apples there.

595
00:27:27,886 --> 00:27:29,416
This was not quite
the intention.

596
00:27:29,416 --> 00:27:30,746
When you go into
Cambridge Common

597
00:27:30,746 --> 00:27:33,636
when we decided we were getting
bored at this point in the day,

598
00:27:33,636 --> 00:27:36,426
ad so we just started throwing
Happy Cat and taking pictures,

599
00:27:36,766 --> 00:27:40,486
but she had decided to take
this to heart [laughter].

600
00:27:40,606 --> 00:27:44,476
So congrats to her
section there.

601
00:27:44,796 --> 00:27:46,466
Just a couple of others.

602
00:27:46,506 --> 00:27:52,796
The next submission came from
our Drew Rob section, by Mark,

603
00:27:52,966 --> 00:27:54,156
so pretty much Mark seems

604
00:27:54,156 --> 00:27:56,546
to have shouldered the
entire project himself.

605
00:27:56,936 --> 00:27:58,886
Here is Mark in Maxwell Dworkin.

606
00:27:59,546 --> 00:28:01,856
Here is Mark outside
Maxwell Dworkin.

607
00:28:03,156 --> 00:28:08,546
[Laughter] Here is Mark in
Northwest Science, alone there.

608
00:28:08,686 --> 00:28:13,736
Here is Mark in Northwest
Science sliding down the pole.

609
00:28:14,066 --> 00:28:20,376
Here is Mark hiding, and,
again, there's just a theme.

610
00:28:20,376 --> 00:28:25,566
Here is Mark checking his
voicemail, and, lastly,

611
00:28:25,566 --> 00:28:27,556
here is Mark with his
head in the statue.

612
00:28:28,086 --> 00:28:30,506
So congrats to Mark and
Drew's section, and,

613
00:28:30,506 --> 00:28:32,486
lastly, Rose's section.

614
00:28:32,486 --> 00:28:34,196
They used this neat
feature of Google maps

615
00:28:34,386 --> 00:28:36,686
where you can actually
pinpoint where you found things,

616
00:28:36,686 --> 00:28:37,656
so if you're curious as to

617
00:28:37,846 --> 00:28:41,326
where all the photos you didn't
go find were, do take a look

618
00:28:41,326 --> 00:28:43,436
at this particular link,
and what you'll see

619
00:28:43,436 --> 00:28:46,916
in just a moment, hopefully,
is a bunch of blue markers.

620
00:28:47,676 --> 00:28:48,436
Still loading.

621
00:28:48,766 --> 00:28:51,526
Yes, it's slow, and
what you'll see

622
00:28:51,526 --> 00:28:55,766
on the map...come
on...come on, Google maps.

623
00:28:56,176 --> 00:28:59,426
What this section may
have...at least one section did,

624
00:28:59,676 --> 00:29:02,016
or may have done because
I may have mentioned this

625
00:29:02,016 --> 00:29:04,176
at one point, is when
it was getting hard

626
00:29:04,176 --> 00:29:06,296
to fined the photos,
especially the ones at the tops

627
00:29:06,296 --> 00:29:08,246
of buildings, which frankly
I actually forgot, too,

628
00:29:08,246 --> 00:29:10,926
where they were, so we were
hoping you would find them.

629
00:29:10,926 --> 00:29:14,116
What you can do is actually look

630
00:29:14,116 --> 00:29:16,086
at what's called
the exit data inside

631
00:29:16,086 --> 00:29:16,966
of a jpegs [assumed
spelling], so in addition

632
00:29:16,966 --> 00:29:18,696
to recovering the
data of the jpegs,

633
00:29:18,696 --> 00:29:23,216
jpegs also have some metadata,
which is things like the name

634
00:29:23,216 --> 00:29:26,096
of the file, the type of camera
that took it, and the date

635
00:29:26,096 --> 00:29:28,356
and time at which
the photo was taken.

636
00:29:28,406 --> 00:29:31,066
So, in fact, if you
assumed, reasonably,

637
00:29:31,066 --> 00:29:34,116
that we followed a path through
campus and didn't randomly run

638
00:29:34,116 --> 00:29:36,626
around campus taking photos and
then revisiting those places,

639
00:29:36,886 --> 00:29:39,696
you can actually kind of
trace or infer our steps based

640
00:29:39,696 --> 00:29:41,336
on these time stamps
in the photos.

641
00:29:41,336 --> 00:29:43,786
Now 2 years ago, this
didn't even occur to us,

642
00:29:43,786 --> 00:29:45,346
and there's a little
emblem on the back

643
00:29:45,346 --> 00:29:48,056
of the John Harvard statue that
even no tourist had ever seen.

644
00:29:48,316 --> 00:29:48,956
We found this.

645
00:29:48,956 --> 00:29:50,766
We photographed it, and
we were amazed that one

646
00:29:50,766 --> 00:29:52,156
of the sections actually
found it,

647
00:29:52,326 --> 00:29:53,606
and it was because
of that trick.

648
00:29:53,606 --> 00:29:55,546
Well, last year we decided
to mess with students,

649
00:29:55,796 --> 00:29:57,906
so we altered all of the
time stamps just to kind

650
00:29:57,906 --> 00:29:59,076
of send them every which way.

651
00:30:00,436 --> 00:30:04,016
That kind of hurt participation,
so we didn't do that this year,

652
00:30:04,016 --> 00:30:05,766
and unfortunately
Google maps doesn't seem

653
00:30:05,766 --> 00:30:07,936
to be cooperating here,
but you will eventually see

654
00:30:07,936 --> 00:30:11,186
from Rose's section a
sprinkling of markers all

655
00:30:11,186 --> 00:30:12,296
over Harvard's campus,

656
00:30:12,296 --> 00:30:16,156
and inside of those little
cartoon bubbles are the

657
00:30:16,156 --> 00:30:17,176
directions to them.

658
00:30:18,056 --> 00:30:20,386
So, we'll defer to
that one online.

659
00:30:20,386 --> 00:30:23,796
So with...oh...so, there
were four sections.

660
00:30:24,036 --> 00:30:26,836
I used my computer to
make four certificates

661
00:30:26,836 --> 00:30:28,786
of distinction this morning.

662
00:30:29,056 --> 00:30:32,946
Could...if the TF's are here or
one student from each section

663
00:30:32,946 --> 00:30:35,916
from Lee, John's, Drew,
and Rose's section,

664
00:30:35,916 --> 00:30:36,786
would you like to come on up,

665
00:30:36,946 --> 00:30:39,476
and we'll be taking
these sections to a meal

666
00:30:39,476 --> 00:30:41,396
in the square right
after Thanksgiving break

667
00:30:41,396 --> 00:30:43,106
as their prize for their stroll.

668
00:30:43,666 --> 00:30:44,436
I see Drew.

669
00:30:44,436 --> 00:30:45,416
I see Rose.

670
00:30:46,646 --> 00:30:49,786
I don't see Lee or John, which
means someone from Lee...

671
00:30:49,786 --> 00:30:51,716
oh, Mark. Mark is here.

672
00:30:52,046 --> 00:30:53,606
[Laughter] Come on up.

673
00:30:54,236 --> 00:30:55,386
[Applause] Congrats
to these guys.

674
00:30:57,246 --> 00:30:58,296
Very nicely done.

675
00:30:59,026 --> 00:30:59,486
We'll be in touch.

676
00:31:02,366 --> 00:31:03,066
This is Mark.

677
00:31:03,406 --> 00:31:03,606
[Laughter] Ok.

678
00:31:03,686 --> 00:31:08,956
Congrats. Oh, and do you
mind...the TF's...do you...oh,

679
00:31:08,956 --> 00:31:09,466
there we go.

680
00:31:11,646 --> 00:31:12,786
Ok. Rose. [Background
conversation] Oh,

681
00:31:13,236 --> 00:31:14,606
you're together.

682
00:31:15,176 --> 00:31:16,426
Drew is right there though.

683
00:31:16,426 --> 00:31:18,226
What are you going
to make me come down?

684
00:31:18,226 --> 00:31:18,836
All right.

685
00:31:18,836 --> 00:31:19,666
There we go.

686
00:31:19,956 --> 00:31:20,376
There we go.

687
00:31:20,416 --> 00:31:21,616
Congrats to you guys.

688
00:31:21,616 --> 00:31:22,976
So, we'll have a nice
meal before long.

689
00:31:23,516 --> 00:31:27,486
[ Applause ]

690
00:31:27,986 --> 00:31:28,566
All right.

691
00:31:28,736 --> 00:31:31,866
So, if that weren't enough fun
problem sets, six challenged you

692
00:31:31,866 --> 00:31:35,826
to memorize RAM and CPU time,
and it's probably just as well

693
00:31:35,826 --> 00:31:37,166
because now it will
get a bit awkward

694
00:31:37,166 --> 00:31:39,756
because not only did Drew
Rob, now Teaching Fellow,

695
00:31:39,866 --> 00:31:42,286
win all of these contests
last year as a student,

696
00:31:42,586 --> 00:31:44,326
he seems to have done so again,

697
00:31:44,806 --> 00:31:47,516
but this is not a bad
thing because, frankly,

698
00:31:47,516 --> 00:31:49,146
we definitely noticed
that it seemed

699
00:31:49,146 --> 00:31:52,476
to have incentivized a number
of your classmates, namely Kevin

700
00:31:52,476 --> 00:31:56,056
and Allen up here at the top of
the list to really try to best

701
00:31:56,056 --> 00:31:58,566
that time, and even though they
didn't, this is damn remarkable,

702
00:31:58,566 --> 00:32:01,606
and so are Kevin and Allen
here who would like to come up

703
00:32:01,686 --> 00:32:03,386
and recognize for
this accomplishment?

704
00:32:03,386 --> 00:32:03,826
Come on down.

705
00:32:04,516 --> 00:32:12,176
[ Applause ]

706
00:32:12,676 --> 00:32:16,316
So the catch is, if you don't
mind, just giving us a couple

707
00:32:16,316 --> 00:32:20,336
of sentences on how you
minimized your CPU time

708
00:32:20,376 --> 00:32:20,956
if you're up for it.

709
00:32:21,536 --> 00:32:21,776
>> Kevin: Ok.

710
00:32:21,936 --> 00:32:22,776
>> David: Kevin?

711
00:32:22,966 --> 00:32:27,236
>> Kevin: So I actually
coded my program in Assembly.

712
00:32:27,236 --> 00:32:30,096
[Laughter] I used this X86
instruction that [inaudible].

713
00:32:30,096 --> 00:32:34,126
>> David: You didn't
think of that, did you?

714
00:32:34,416 --> 00:32:37,946
>> Yeah, I didn't
think of that either.

715
00:32:37,946 --> 00:32:38,716
Yeah, I don't know.

716
00:32:38,716 --> 00:32:40,646
I talked to my TF, who's
actually Drew, [laughter].

717
00:32:40,646 --> 00:32:43,486
He gave us good tips.

718
00:32:43,486 --> 00:32:43,553
[Applause]

719
00:32:43,553 --> 00:32:44,276
>> David: Congrats.

720
00:32:47,496 --> 00:32:48,726
All right.

721
00:32:49,486 --> 00:32:55,116
And here. This is perhaps
even more fitting than before.

722
00:32:55,116 --> 00:32:56,126
So, here you are.

723
00:32:57,466 --> 00:32:58,016
[Laughter] So congrats.

724
00:32:58,016 --> 00:33:01,096
So realize that winning
the big board was not what

725
00:33:01,096 --> 00:33:02,046
that was all about.

726
00:33:02,046 --> 00:33:03,996
It was fairly [inaudible]
and just making it

727
00:33:03,996 --> 00:33:05,896
to the big board even if
you were at the very bottom,

728
00:33:06,136 --> 00:33:07,286
props to you nonetheless.

729
00:33:07,286 --> 00:33:12,056
So congrats though nonetheless
to these guys who really went

730
00:33:12,056 --> 00:33:13,646
above and beyond in
putting in the time.

731
00:33:13,646 --> 00:33:16,756
So, Drew, again,
walks away this year

732
00:33:16,756 --> 00:33:21,926
with 113 quintillion dollars,
having grown that from 10,000.

733
00:33:21,926 --> 00:33:24,276
Allen, don't go too far
because I think we'll put you

734
00:33:24,276 --> 00:33:27,736
on the spot and answer the
question everyone might have

735
00:33:27,736 --> 00:33:32,156
wondered at the time which
was how did you earn only 11

736
00:33:32,156 --> 00:33:33,156
quintillion dollars?

737
00:33:33,156 --> 00:33:34,976
If you wouldn't mind returning
to the stage for a moment.

738
00:33:35,516 --> 00:33:41,596
[ Background noise ]

739
00:33:42,096 --> 00:33:47,036
>> Allen: So, yeah, what I
did is I stole Charles' idea

740
00:33:47,446 --> 00:33:52,256
of just trading volume indices,
but Drew did better than me

741
00:33:52,256 --> 00:33:54,026
because he figured out you
didn't even need to wait

742
00:33:54,026 --> 00:33:56,736
for them to improve because
if you put like a bunch

743
00:33:56,866 --> 00:33:58,926
of like random characters
in there,

744
00:33:58,926 --> 00:34:01,266
it like only remembered
it some of the time,

745
00:34:01,806 --> 00:34:03,976
so Drew basically
made a bunch of trades

746
00:34:04,656 --> 00:34:08,146
where he basically immediately
made like, I don't know,

747
00:34:08,146 --> 00:34:11,516
like a quintillion dollars every
time, and then just made a ton

748
00:34:11,516 --> 00:34:12,276
of them and crushed me.

749
00:34:12,276 --> 00:34:12,706
[Laughter]

750
00:34:12,706 --> 00:34:14,996
>> David: Well congrats
nonetheless.

751
00:34:15,996 --> 00:34:20,266
[Applause] All right.

752
00:34:20,436 --> 00:34:22,996
So, admittedly there's
some bugs in our big board.

753
00:34:23,096 --> 00:34:25,626
We'll perhaps take
care of that next year,

754
00:34:25,626 --> 00:34:28,186
but this is by far the
first time that someone

755
00:34:28,186 --> 00:34:31,456
so completely vanquished
all previous records.

756
00:34:31,696 --> 00:34:35,346
So we wanted to recognize
one other student.

757
00:34:35,346 --> 00:34:37,516
We...take a look at
the big statistics

758
00:34:37,516 --> 00:34:39,856
for the bulletin board, which
is, if you never tuned in,

759
00:34:39,856 --> 00:34:42,636
and now that we know that you
did or didn't because we looked

760
00:34:42,636 --> 00:34:44,836
at the statistics, is the
synonymous bulletin board

761
00:34:44,836 --> 00:34:47,346
by which you can ask
questions, answer questions,

762
00:34:47,346 --> 00:34:50,366
and there was three folks in
particular, and I'm happy now

763
00:34:50,366 --> 00:34:52,996
to pat myself on the back that
I blew you all away when it came

764
00:34:52,996 --> 00:34:54,276
to posting to the
bulletin board,

765
00:34:54,616 --> 00:34:57,706
followed by Glen
Holloway, who you never see,

766
00:34:57,706 --> 00:34:59,386
but who's also been
invaluable as sort

767
00:34:59,386 --> 00:35:01,476
of my behind the scenes
consularie in the course,

768
00:35:01,666 --> 00:35:06,546
but Jeremy Cushman, if he's
here, with 162 answers really.

769
00:35:06,546 --> 00:35:07,816
There was an occasional
question,

770
00:35:07,816 --> 00:35:10,456
but we're quite grateful that he
would often pluck off questions

771
00:35:10,456 --> 00:35:12,406
before we even had a chance.

772
00:35:12,406 --> 00:35:13,976
So Jeremy, we made you
a certificate, too.

773
00:35:14,516 --> 00:35:21,956
[ Applause ]

774
00:35:22,456 --> 00:35:23,456
Very nicely done.

775
00:35:24,526 --> 00:35:25,396
>> Jeremy: Thank you.

776
00:35:25,506 --> 00:35:29,466
>> David: Have another...we
always get them afterward.

777
00:35:29,756 --> 00:35:30,126
All right.

778
00:35:30,426 --> 00:35:34,066
So with that and hopefully at
this point, you have filled

779
00:35:34,066 --> 00:35:35,816
out a few questions
on this piece of paper

780
00:35:35,816 --> 00:35:37,736
because you only have a
couple more minutes to do so.

781
00:35:37,806 --> 00:35:39,416
So you have in your hands
from when you walked

782
00:35:39,416 --> 00:35:41,846
in probably a piece of
paper, and the bottom corner

783
00:35:41,846 --> 00:35:43,176
of which is either
the number one

784
00:35:43,446 --> 00:35:44,806
or the number two on the back.

785
00:35:45,026 --> 00:35:46,026
This was an accident.

786
00:35:46,026 --> 00:35:48,346
This is what happens
when I send an email

787
00:35:48,346 --> 00:35:49,946
to have something photocopied

788
00:35:49,946 --> 00:35:53,616
and don't think we only wanted
you to get side 2 or side 1,

789
00:35:53,856 --> 00:35:56,096
so we thought we'd leverage
some probability here,

790
00:35:56,096 --> 00:35:58,376
and we're just saying go ahead
and fill out with questions

791
00:35:58,376 --> 00:36:02,626
and answers either side 1 or
side 2, and we're hoping purely

792
00:36:02,626 --> 00:36:05,066
by chance that roughly
50% of you will choose 1

793
00:36:05,336 --> 00:36:06,996
and 50% of you will choose 2.

794
00:36:06,996 --> 00:36:08,736
So if you haven't done
that, take the last couple

795
00:36:08,736 --> 00:36:11,086
of minutes here to do so
and come up with a couple

796
00:36:11,086 --> 00:36:14,756
of quiz show like questions, and
what I thought I would do then

797
00:36:14,926 --> 00:36:17,866
as you finish that
up is this here.

798
00:36:18,266 --> 00:36:21,246
So we looked at the surveys from
problem set 5, and you'll be hit

799
00:36:21,246 --> 00:36:23,256
with one more toward
the end of the semester

800
00:36:23,256 --> 00:36:26,266
because it's invaluable data for
us as we improve this semester,

801
00:36:26,496 --> 00:36:28,376
and I wanted to give
this student his

802
00:36:28,376 --> 00:36:30,656
or her 15 seconds of fame, too.

803
00:36:30,656 --> 00:36:35,276
So this is respondent number
29 who wanted their survey put

804
00:36:35,276 --> 00:36:37,916
up just like the birthday boy
from a couple of weeks ago.

805
00:36:37,916 --> 00:36:41,496
This was interesting, and
whenever we see nonsense,

806
00:36:41,496 --> 00:36:45,156
we tend to assume that it's
something like route 13, so,

807
00:36:45,156 --> 00:36:48,036
yep, we pulled this up
here, route 13 converter.

808
00:36:48,216 --> 00:36:50,356
I'll just go with
the top link here.

809
00:36:50,436 --> 00:36:51,186
Nope, not working.

810
00:36:51,186 --> 00:36:53,006
We'll go for the
second link here.

811
00:36:53,266 --> 00:36:54,786
We could do this
by hand, of course.

812
00:36:54,786 --> 00:36:56,736
We know how, but I'm just
going to go ahead and fill

813
00:36:56,736 --> 00:37:01,886
in that blank like route 13, and
this student had this to say.

814
00:37:01,886 --> 00:37:04,496
[Laughter] So your 15 seconds
are now up, but thank you

815
00:37:04,496 --> 00:37:08,616
for your feedback, and
this was also a theme here,

816
00:37:08,616 --> 00:37:09,486
too, in the survey.

817
00:37:09,486 --> 00:37:10,816
So I only took one
of these quotes,

818
00:37:11,066 --> 00:37:12,676
but throughout the surveys

819
00:37:12,676 --> 00:37:15,906
for pset 5 were comments
along these lines.

820
00:37:15,906 --> 00:37:17,566
So you recall that
the course website

821
00:37:17,566 --> 00:37:20,876
for some time featured a whole
bunch of wall cats which, no,

822
00:37:21,516 --> 00:37:22,906
of course the website
featured for a whole bunch

823
00:37:22,906 --> 00:37:25,276
of time some staffs,
so teaching fellows,

824
00:37:25,276 --> 00:37:27,676
[inaudible] course
assistants, and occasionally me,

825
00:37:27,756 --> 00:37:30,266
we decided to swap
ourselves out recently

826
00:37:30,266 --> 00:37:34,956
with a wall cat of the day.

827
00:37:35,066 --> 00:37:36,846
[Laughter] So, this is
from a very popular,

828
00:37:36,846 --> 00:37:39,836
funny website called
icanhascheezburger.com,

829
00:37:40,066 --> 00:37:42,976
and they provide what's
called an RSS feed.

830
00:37:42,976 --> 00:37:46,046
RSS is an XML based language,
a tag based language,

831
00:37:46,046 --> 00:37:47,826
and you know, we had
a bit of free time

832
00:37:47,826 --> 00:37:49,066
so we went to their website.

833
00:37:49,266 --> 00:37:51,256
We found the link to RSS feed.

834
00:37:51,416 --> 00:37:53,216
We then wrote a little
PHP program

835
00:37:53,216 --> 00:37:55,566
that every few minutes
queries their website,

836
00:37:55,566 --> 00:37:59,536
grabs at that RSS feed, and
much like our proxy for pset 8,

837
00:37:59,796 --> 00:38:02,376
traverse the RSS that came
back from Google news,

838
00:38:02,596 --> 00:38:04,956
so do we traverse the
RSS that comes back

839
00:38:04,956 --> 00:38:06,116
from icanhascheezburger.

840
00:38:06,116 --> 00:38:08,976
We look for the most recent
jpeg that they've imbedded

841
00:38:08,976 --> 00:38:11,066
in their RSS feed,
and then we save

842
00:38:11,066 --> 00:38:14,216
in our local database a copy of
that URL, and then we proceed

843
00:38:14,216 --> 00:38:15,656
to imbed it in our own website,

844
00:38:15,656 --> 00:38:18,236
and so this thing doesn't
change every minute or so,

845
00:38:18,236 --> 00:38:20,826
but any time they update their
feed, within a few minutes,

846
00:38:21,016 --> 00:38:23,296
we've actually captured
these changes as well.

847
00:38:23,296 --> 00:38:26,006
And we also dove in and played
around with some other things

848
00:38:26,006 --> 00:38:28,346
which we thought we'd draw
your attention to because,

849
00:38:28,346 --> 00:38:30,646
as you exit this course,
there will come a point

850
00:38:30,646 --> 00:38:32,536
where you're certainly not
going to be handed a PDF

851
00:38:32,536 --> 00:38:36,546
that tells you exactly how to
proceed to tackle some problem,

852
00:38:36,796 --> 00:38:38,556
so we've been having great
fun this year building

853
00:38:38,556 --> 00:38:39,536
out these various API's,

854
00:38:39,826 --> 00:38:41,736
application programming
interfaces,

855
00:38:41,836 --> 00:38:43,356
and this is really
just to lower the bar

856
00:38:43,356 --> 00:38:45,566
to getting data that's
interesting on campus,

857
00:38:45,616 --> 00:38:47,316
but as this Wiki
page, which is linked

858
00:38:47,316 --> 00:38:51,296
on the course's website reveals,
there are so many fun data sets

859
00:38:51,536 --> 00:38:54,266
and tools that you can patch
into whether it's for the iPhone

860
00:38:54,266 --> 00:38:58,156
or Facebook or calendars or
finance or maps or any number

861
00:38:58,156 --> 00:39:00,556
of things, and so just
to inspire your, oh,

862
00:39:00,556 --> 00:39:03,476
forthcoming final projects, I
thought I'd draw your attention

863
00:39:03,476 --> 00:39:05,596
to the solving of two
problems, for instance.

864
00:39:05,596 --> 00:39:07,026
So we have a number
of students who want

865
00:39:07,026 --> 00:39:09,696
to implement some
food based projects

866
00:39:09,696 --> 00:39:12,216
for their final project, and by
that, we mean doing something

867
00:39:12,216 --> 00:39:15,446
with the dining hall, and you
may recall crimsondining.org was

868
00:39:15,446 --> 00:39:18,436
made by a former
CS50 student and TF

869
00:39:18,806 --> 00:39:21,426
that does something along these
lines, but we decided that,

870
00:39:21,426 --> 00:39:23,616
you know, it's not going
to be the best use of time

871
00:39:23,786 --> 00:39:25,856
if a whole bunch of
students go to wub, wub,

872
00:39:25,856 --> 00:39:27,986
wub dining.harvard.edu.

873
00:39:28,186 --> 00:39:30,186
They pull up the menu, and
then you have to figure

874
00:39:30,186 --> 00:39:33,936
out somehow how to get this
data into your website.

875
00:39:34,116 --> 00:39:37,036
So a number of you at this point
in the term are probably a,

876
00:39:37,036 --> 00:39:39,976
not thinking about final
projects at all or 2,

877
00:39:39,976 --> 00:39:42,466
are but really have no
idea how you're going

878
00:39:42,466 --> 00:39:45,396
to implement what you proposed
implementing in your proposal.

879
00:39:45,396 --> 00:39:46,896
So just to help you realize

880
00:39:46,896 --> 00:39:50,156
that you now have underneath
your belt a whole bunch of tools

881
00:39:50,416 --> 00:39:52,706
and building blocks with which
you can figure these things

882
00:39:52,706 --> 00:39:54,756
out on your own, I
thought I'd in just 60

883
00:39:54,756 --> 00:39:58,296
or so seconds explain how
we went about grabbing all

884
00:39:58,296 --> 00:40:00,016
of the data from
Harvard dining website,

885
00:40:00,016 --> 00:40:03,296
Harvard dining's website,
so that we now reexpose it

886
00:40:03,296 --> 00:40:05,656
to any student who
wants it in CSE format

887
00:40:05,656 --> 00:40:08,826
or in Jason format via
that Wiki page before.

888
00:40:08,826 --> 00:40:10,546
So I went to this
website, and I said, wow,

889
00:40:10,766 --> 00:40:12,986
I'd really like to
start screen scraping,

890
00:40:12,986 --> 00:40:14,966
as it's called-grabbing
data from this website

891
00:40:15,186 --> 00:40:17,596
so I can get it into my own
database, some turkey sausage,

892
00:40:17,596 --> 00:40:19,936
some egg beater, some egg
whites, so I took a look

893
00:40:19,936 --> 00:40:22,026
at the source code for this
page, and in the source code

894
00:40:22,026 --> 00:40:25,986
of this page is, all
right, some HTML, or XHTML,

895
00:40:26,176 --> 00:40:29,066
and then I noticed, all right,
let me search for sausage.

896
00:40:29,066 --> 00:40:31,236
So I knew that that's
in the webpage,

897
00:40:31,506 --> 00:40:34,536
so here's my turkey sausage,
and I realized that there seems

898
00:40:34,536 --> 00:40:35,906
to be a structure to this page.

899
00:40:35,906 --> 00:40:36,726
It's a bit messy.

900
00:40:36,916 --> 00:40:38,526
It's kind of indented
all over the place,

901
00:40:38,776 --> 00:40:40,796
but notice that turkey
sausage is inside

902
00:40:40,796 --> 00:40:42,346
of an anchor tag, a link.

903
00:40:42,566 --> 00:40:43,826
That's inside of a span.

904
00:40:44,006 --> 00:40:46,476
That's inside of a dib, but
even more interesting is

905
00:40:46,476 --> 00:40:48,856
that that dib has sort
of a special moniker.

906
00:40:48,856 --> 00:40:51,656
It's of class item
wrap, and, sure enough,

907
00:40:51,656 --> 00:40:53,866
if I continued scrolling
down through the file,

908
00:40:54,016 --> 00:40:54,976
pretty much any piece

909
00:40:54,976 --> 00:40:57,706
of food-here's egg
beaters-was similarly inside

910
00:40:57,706 --> 00:40:59,526
of a dib whose class
is item wrap.

911
00:40:59,726 --> 00:41:01,626
So I noticed this
pattern, and I figured, oh,

912
00:41:01,846 --> 00:41:05,696
if I can now somehow go
after this XHTML looking

913
00:41:05,696 --> 00:41:08,996
for this pattern, I can do
what's called screen scrape.

914
00:41:09,306 --> 00:41:13,686
So I went to my command line,
and I pulled up a little PHP.

915
00:41:13,686 --> 00:41:16,406
I pulled up my text editor, and
I ended up writing something

916
00:41:16,406 --> 00:41:17,936
that looks a little
something like this.

917
00:41:18,006 --> 00:41:20,896
And how all this code works
doesn't matter so much now.

918
00:41:20,896 --> 00:41:23,416
I'm happy to send this to
folks by email if you'd

919
00:41:23,416 --> 00:41:26,926
like to take a closer look,
but, in a nutshell, I went ahead

920
00:41:26,926 --> 00:41:31,106
and I grabbed the URL, I
pasted the URL from the browser

921
00:41:31,106 --> 00:41:35,026
into this script somewhere in
a constant, and then I proceed

922
00:41:35,026 --> 00:41:38,646
to fetch that using file get
contents or something similar

923
00:41:38,646 --> 00:41:40,546
which actually then
goes and grabs the data,

924
00:41:40,546 --> 00:41:43,016
and then I did this trick
and this is your little hint.

925
00:41:43,016 --> 00:41:46,196
If you ever have to do this in
life, when you have XML data,

926
00:41:46,286 --> 00:41:47,596
there are ways of querying

927
00:41:47,596 --> 00:41:49,726
that XML data using a
language called XPATH,

928
00:41:50,486 --> 00:41:53,286
and XPATH essentially lets
you say something like this.

929
00:41:53,636 --> 00:41:56,206
If you want to get out
all the dibs in the page,

930
00:41:56,436 --> 00:42:00,516
you use a query like
slash HTML, slash body,

931
00:42:01,026 --> 00:42:04,516
and then you can do something
like slash, slash, dib,

932
00:42:04,516 --> 00:42:07,746
and this expression, it's sort
of like a file system path-c,

933
00:42:07,746 --> 00:42:08,626
colon, backslash

934
00:42:08,626 --> 00:42:12,426
or whatever-that path there will
return to me an array of all

935
00:42:12,426 --> 00:42:14,416
of the dibs inside of the body,

936
00:42:14,416 --> 00:42:16,356
and so this slash
notation is very similar

937
00:42:16,356 --> 00:42:17,756
in spirits any file system.

938
00:42:17,756 --> 00:42:21,126
So long story short, I
wrote a script that searches

939
00:42:21,126 --> 00:42:22,576
through this source code,

940
00:42:22,576 --> 00:42:24,696
grabs all of the dibs,
and then I check.

941
00:42:24,696 --> 00:42:26,296
Are you a type class item wrap?

942
00:42:26,406 --> 00:42:27,386
Are you? Are you?

943
00:42:27,546 --> 00:42:29,646
And then using very
similar syntax then I pluck

944
00:42:29,646 --> 00:42:32,366
out turkey sausage and egg
beaters and egg whites,

945
00:42:32,366 --> 00:42:36,416
and then finally I did an
insert into my SQL tables.

946
00:42:36,416 --> 00:42:39,026
So the end result is that
if you ever want to find

947
00:42:39,026 --> 00:42:41,986
out what's coming
up for breakfast,

948
00:42:42,166 --> 00:42:46,016
you can execute a query of CS50
zone server, get back a CSB file

949
00:42:46,256 --> 00:42:50,556
that looks much more machine
friendly, a CSB file with rows

950
00:42:50,556 --> 00:42:53,136
and columns and dates and
food types and all of this.

951
00:42:53,366 --> 00:42:55,226
So, again, you now
have the ability

952
00:42:55,226 --> 00:42:57,816
to at least identify
potential problems,

953
00:42:57,816 --> 00:43:00,086
and hopefully now you have
heard enough details that even

954
00:43:00,086 --> 00:43:03,106
if you have no idea about
how to go about using XPATH,

955
00:43:03,566 --> 00:43:04,886
it's really just a Google search

956
00:43:04,886 --> 00:43:07,616
or Wikipedia article
away at this point.

957
00:43:07,616 --> 00:43:11,186
Finally, we also had some fun
this weekend given that so many

958
00:43:11,186 --> 00:43:13,196
of you have been diving into
your own final projects,

959
00:43:13,196 --> 00:43:14,926
we decided to take
our own map site,

960
00:43:15,176 --> 00:43:16,196
research from Mather House,

961
00:43:16,456 --> 00:43:19,176
and now we integrate Wikipedia
articles automatically

962
00:43:19,176 --> 00:43:19,786
into the thing.

963
00:43:19,786 --> 00:43:21,256
Why? Just because.

964
00:43:21,256 --> 00:43:23,536
And also for official
photographs of all

965
00:43:23,536 --> 00:43:25,576
of the buildings and so you
get little pop ups like this

966
00:43:25,576 --> 00:43:27,316
from Mather House,
and if you'd really

967
00:43:27,316 --> 00:43:30,746
like to engage dynamically in
something like this and don't

968
00:43:30,746 --> 00:43:32,856
like the fact that
Wikipedia's telling the world

969
00:43:32,856 --> 00:43:35,246
that Mather is the box
that dumpster came in,

970
00:43:35,246 --> 00:43:40,496
quote, unquote, well hey.

971
00:43:40,496 --> 00:43:41,666
[Laughter] We don't
sensor in 50.

972
00:43:41,666 --> 00:43:44,256
Well, hey if you don't like
it, Matherites, go change it.

973
00:43:44,256 --> 00:43:46,546
We'll notice the change
within an hour or so

974
00:43:46,546 --> 00:43:48,366
of it getting edited
on Wikipedia,

975
00:43:48,866 --> 00:43:51,626
so perhaps we'll induce some
changes to all the houses.

976
00:43:51,626 --> 00:43:54,486
We can, let's see what
Lowell House has to say

977
00:43:54,486 --> 00:43:58,726
in Wikipedia...one of the
twelve, dat, dat, dat.

978
00:43:58,866 --> 00:44:01,066
It's actually a very
nice flattering article.

979
00:44:01,766 --> 00:44:04,556
So [laughter] Lowell House
is a little nicer there.

980
00:44:04,556 --> 00:44:08,116
And then finally, did
we do anything else?

981
00:44:08,186 --> 00:44:09,196
No. That's enough for now.

982
00:44:09,516 --> 00:44:11,676
So, hopefully, at this point
in the story, you've filled

983
00:44:11,676 --> 00:44:13,496
out this form, yea or nay.

984
00:44:13,886 --> 00:44:16,406
So we had a few volunteers
from staff,

985
00:44:16,406 --> 00:44:19,426
so could our staff
contestants come on up?

986
00:44:19,876 --> 00:44:24,826
A few faces may look quite
familiar, and really any

987
00:44:24,826 --> 00:44:26,556
of the staff who are seated
here are welcome to come

988
00:44:26,556 --> 00:44:30,336
up on stage-the more the
merrier, and now we need

989
00:44:30,336 --> 00:44:33,166
at least two, maybe three,
of those less comfortable,

990
00:44:33,166 --> 00:44:36,186
more comfortable, or
somewhere in between

991
00:44:36,376 --> 00:44:40,366
to take the remaining chairs up
here for our finale quiz show

992
00:44:40,366 --> 00:44:42,646
of sorts, for which
you, hopefully,

993
00:44:42,646 --> 00:44:43,556
just wrote the questions.

994
00:44:44,816 --> 00:44:51,376
Any volunteers who would like
to match wits with the staff?

995
00:44:51,376 --> 00:44:51,906
>> Down here.

996
00:44:51,906 --> 00:44:52,146
>> David: Yep.

997
00:44:52,146 --> 00:44:52,776
Ok. Come on.

998
00:44:52,776 --> 00:44:55,946
Ok. You, too, and three, and
is there someone down here?

999
00:44:56,346 --> 00:44:57,376
Four. Come on down.

1000
00:44:57,666 --> 00:44:58,646
All right.

1001
00:44:58,646 --> 00:45:00,226
I think we have enough
chairs for everyone.

1002
00:45:00,386 --> 00:45:01,106
Oh we have five.

1003
00:45:01,166 --> 00:45:02,396
Fifth, fifth contestant?

1004
00:45:02,506 --> 00:45:04,016
Oh, ok. Five and six.

1005
00:45:04,046 --> 00:45:04,946
Come on up.

1006
00:45:04,946 --> 00:45:05,626
All right.

1007
00:45:05,626 --> 00:45:07,596
So it's now six versus four.

1008
00:45:08,066 --> 00:45:11,036
Let me go ahead and ask
Jansu and the remaining TF's

1009
00:45:11,036 --> 00:45:12,746
who are a little too shy
apparently to come on up.

1010
00:45:12,956 --> 00:45:15,216
Could you guys just collect the
forms that people have filled

1011
00:45:15,216 --> 00:45:17,826
out and bring them on up
front, ideally flipping them

1012
00:45:17,826 --> 00:45:19,716
for the right side based
on what's been filled out?

1013
00:45:20,306 --> 00:45:21,206
Come on up.

1014
00:45:21,286 --> 00:45:22,086
That's very nice.

1015
00:45:28,136 --> 00:45:28,606
Oscar. [Background
noise] All right.

1016
00:45:29,006 --> 00:45:30,676
So, can you grab a
couple, two chairs?

1017
00:45:33,306 --> 00:45:36,336
In just a moment, you'll see
another website we've been

1018
00:45:36,336 --> 00:45:39,636
working on which looks
a little like this.

1019
00:45:40,416 --> 00:45:42,736
Very high tech.

1020
00:45:43,606 --> 00:45:45,496
This is all HTML based,

1021
00:45:46,636 --> 00:45:49,946
and in just...this is the
biggest Jeopardy competition

1022
00:45:49,946 --> 00:45:50,456
we've ever had.

1023
00:45:50,456 --> 00:45:59,746
Ok. So in just a moment,
we will have the following.

1024
00:45:59,746 --> 00:46:05,746
>> And now here is
the host of Jeopardy.

1025
00:46:05,846 --> 00:46:06,266
And now here...

1026
00:46:06,266 --> 00:46:06,333
>> David: Oh.

1027
00:46:06,333 --> 00:46:07,206
My iPod is on loop.

1028
00:46:07,326 --> 00:46:08,826
Awkward. All right.

1029
00:46:10,026 --> 00:46:11,226
Normally that sounds better.

1030
00:46:11,266 --> 00:46:11,676
All right.

1031
00:46:11,856 --> 00:46:12,256
Here we go.

1032
00:46:12,256 --> 00:46:15,386
>> [Background noise]
This is Jeopardy.

1033
00:46:17,306 --> 00:46:18,736
>> David: Thank you.

1034
00:46:19,436 --> 00:46:19,816
[Background noise] Thank you.

1035
00:46:21,436 --> 00:46:21,656
Any [inaudible]?

1036
00:46:21,656 --> 00:46:22,326
All right.

1037
00:46:22,676 --> 00:46:25,576
So ok you don't have to
stand there awkwardly.

1038
00:46:25,576 --> 00:46:26,316
You may take your seats.

1039
00:46:27,556 --> 00:46:29,456
So we have just a few
minutes before we adjourn

1040
00:46:29,456 --> 00:46:30,946
to some cake downstairs.

1041
00:46:30,946 --> 00:46:37,506
What you have in front of you
are two huge teams...oh no.

1042
00:46:37,506 --> 00:46:41,136
We can get another...oh,
get a chair.

1043
00:46:41,266 --> 00:46:43,956
Yeah. Thank you.

1044
00:46:45,566 --> 00:46:47,236
Thank you.

1045
00:46:48,176 --> 00:46:52,796
Ok. So, why don't we very
quickly go down the row here

1046
00:46:52,866 --> 00:46:56,096
and say who you are and
say one interesting thing.

1047
00:46:56,096 --> 00:46:57,346
Interpret as you will.

1048
00:46:57,626 --> 00:47:01,226
You. Oh, and be sure to
speak very deliberately

1049
00:47:01,226 --> 00:47:01,856
into the speakers.

1050
00:47:02,776 --> 00:47:09,546
>> Matthew: My name's Matthew
[inaudible], and I'm a CS50 TF

1051
00:47:10,046 --> 00:47:14,906
>> Rose: Hi, I'm Rose Cowl,
and I'm also a CS50 TF.

1052
00:47:15,376 --> 00:47:16,056
>> David: Excellent.

1053
00:47:16,356 --> 00:47:18,016
[Laughter] Keep it going.

1054
00:47:18,416 --> 00:47:18,686
>> Mike: Hi.

1055
00:47:18,686 --> 00:47:20,116
Mike, and I'm also a CS50 TF.

1056
00:47:20,116 --> 00:47:23,656
>> David: Ok, this is
no longer interesting.

1057
00:47:23,656 --> 00:47:23,723
[Laughter]

1058
00:47:23,723 --> 00:47:28,446
>> Greg: Hey, I'm Greg,
and I enjoy making juice.

1059
00:47:28,736 --> 00:47:32,626
>> Kevin: Hi, I'm Kevin,
and I'm Greg's roommate.

1060
00:47:34,326 --> 00:47:35,406
>> Robert: Hi, I'm Robert,

1061
00:47:35,706 --> 00:47:38,116
and I thought it was
really interesting how today

1062
00:47:38,116 --> 00:47:42,646
in EC10 Professor Mankiw alluded
to a set with measure zero.

1063
00:47:42,646 --> 00:47:43,596
[Laughter]

1064
00:47:43,596 --> 00:47:45,976
>> John: Hi, I'm John.

1065
00:47:46,016 --> 00:47:48,146
I'm from Liver House.

1066
00:47:48,146 --> 00:47:49,486
>> Michael: Hi, I'm Michael.

1067
00:47:50,066 --> 00:47:53,216
I'm an econ concentrator
who hates econ.

1068
00:47:53,216 --> 00:47:53,496
[Laughter]

1069
00:47:53,496 --> 00:47:55,856
>> Josh: Hi, I'm Josh.

1070
00:47:56,046 --> 00:47:58,326
I have conducted an orchestra
while wearing a gorilla suit.

1071
00:47:58,326 --> 00:47:58,946
[Laughter]

1072
00:47:58,946 --> 00:48:00,516
>> I'm [inaudible.]
I'm from New Mexico,

1073
00:48:00,736 --> 00:48:04,596
and some people don't realize
it's part of the United States.

1074
00:48:04,596 --> 00:48:05,086
[Laughter]

1075
00:48:05,086 --> 00:48:05,276
>> Anna: I'm Anna.

1076
00:48:05,366 --> 00:48:08,476
I'm from Utah, which used

1077
00:48:08,476 --> 00:48:09,936
to not want any part
of the United States.

1078
00:48:09,936 --> 00:48:10,516
[Laughter]

1079
00:48:10,516 --> 00:48:11,646
>> David: Very nice.

1080
00:48:11,646 --> 00:48:13,496
And we have Jensu
[inaudible] who's going

1081
00:48:13,496 --> 00:48:15,556
to run our scoreboard here.

1082
00:48:15,556 --> 00:48:17,616
We'll have the staff
score on the left,

1083
00:48:17,616 --> 00:48:19,196
the students' score
on the right.

1084
00:48:19,456 --> 00:48:21,846
We did a little coin
toss before class,

1085
00:48:22,116 --> 00:48:23,536
and the students won the toss,

1086
00:48:23,756 --> 00:48:25,856
which means you students
have control of the board.

1087
00:48:25,856 --> 00:48:29,236
We're kind of going to butcher
the logistics of Jeopardy here

1088
00:48:29,236 --> 00:48:31,116
and kind of just
go with what works.

1089
00:48:31,116 --> 00:48:33,726
So, with that said, go
ahead and pick a category.

1090
00:48:33,986 --> 00:48:35,566
If you need a little
cheat sheet,

1091
00:48:35,596 --> 00:48:38,886
you probably...we'll get you
some blank sheets of paper,

1092
00:48:38,886 --> 00:48:39,886
so you know what week was what.

1093
00:48:40,116 --> 00:48:43,446
Go ahead and pick a week
and a dollar amount.

1094
00:48:43,926 --> 00:48:45,106
Anyone on the students' team.

1095
00:48:45,626 --> 00:48:48,236
>> Week 2, 1000.

1096
00:48:48,646 --> 00:48:51,676
>> Week 2 for 1000,
going in strong.

1097
00:48:52,066 --> 00:48:58,956
So your question for week
2-should've said write legibly.

1098
00:48:58,956 --> 00:49:04,496
Your question for week 2...ok
we'll start off with this.

1099
00:49:05,036 --> 00:49:07,876
Rock[assumed spelling] 13 plus
rock 13 equals...first hand

1100
00:49:07,876 --> 00:49:08,316
up gets it.

1101
00:49:09,196 --> 00:49:09,906
Ok, students?

1102
00:49:10,436 --> 00:49:11,026
>> Rock zero.

1103
00:49:12,346 --> 00:49:13,916
>> David: Actually the
answer is awesomeness.

1104
00:49:17,696 --> 00:49:18,786
[Laughter] We'll
give it to them.

1105
00:49:18,786 --> 00:49:19,936
So Jansen will be our judge.

1106
00:49:19,936 --> 00:49:21,426
A thousand dollars
to the students.

1107
00:49:21,426 --> 00:49:24,046
Ok, and you're still in
control of the board.

1108
00:49:27,476 --> 00:49:29,696
We came prepared with this.

1109
00:49:30,916 --> 00:49:31,496
[Applause] Very nice.

1110
00:49:32,776 --> 00:49:33,836
Ok, you're in control.

1111
00:49:33,836 --> 00:49:35,776
What would you like next?

1112
00:49:35,876 --> 00:49:37,666
[Background noise] IQuality
[assumed spelling] is

1113
00:49:37,666 --> 00:49:40,056
on automatic play now.

1114
00:49:40,106 --> 00:49:44,996
What the? [Background noise]
Not very good with technology.

1115
00:49:44,996 --> 00:49:49,366
Ok, students, what
would you like?

1116
00:49:49,986 --> 00:49:50,836
>> Week 3, 800

1117
00:49:50,996 --> 00:49:52,396
>> David: Oh wait, I'm not
doing this right, am I?

1118
00:49:52,836 --> 00:49:55,046
Ok. Week 2, what?

1119
00:49:55,166 --> 00:49:55,546
Sorry?

1120
00:49:55,856 --> 00:49:56,876
>> Week 3, 1000.

1121
00:49:57,216 --> 00:49:58,456
>> David: Week 3 for 1000?

1122
00:49:58,946 --> 00:50:00,036
Ok. Week 3.

1123
00:50:00,036 --> 00:50:06,136
Your question is what
is the lower bound

1124
00:50:06,136 --> 00:50:08,426
on the running time
of bubble sort?

1125
00:50:09,236 --> 00:50:09,356
Matt.

1126
00:50:09,956 --> 00:50:11,266
>> Matt: Omega of N.

1127
00:50:11,436 --> 00:50:15,656
>> David: Omega of N.
Audience, what do you think?

1128
00:50:17,196 --> 00:50:18,836
[Background noise]
Who's going to answer?

1129
00:50:20,006 --> 00:50:22,386
Yes? No? Ok, yes.

1130
00:50:23,156 --> 00:50:25,686
Do we want this to evolve into
one of these things where we...

1131
00:50:26,036 --> 00:50:30,366
[Background noise]
Uh, all right.

1132
00:50:31,306 --> 00:50:32,856
Sanders has never been so proud.

1133
00:50:32,906 --> 00:50:34,216
All right.

1134
00:50:34,386 --> 00:50:35,486
TF's, you are in control.

1135
00:50:35,486 --> 00:50:36,836
What category would you like?

1136
00:50:39,496 --> 00:50:42,676
>> Week 4 for 1000.

1137
00:50:42,676 --> 00:50:45,096
>> David: Week 4 for 1000.

1138
00:50:45,486 --> 00:50:47,716
What happens if you
don't allocate memory

1139
00:50:47,716 --> 00:50:49,396
before signing...Robert?

1140
00:50:49,831 --> 00:50:51,831
>> [inaudible]

1141
00:50:52,266 --> 00:50:53,066
>> David: Bad things.

1142
00:50:55,596 --> 00:50:58,896
[Laughter] Very good for 1000.

1143
00:50:58,956 --> 00:51:00,106
Students are in control.

1144
00:51:02,346 --> 00:51:05,916
Oh, sorry...I'm not...there
we go.

1145
00:51:06,186 --> 00:51:06,686
What's left?

1146
00:51:06,686 --> 00:51:09,736
Everything except those 2.

1147
00:51:10,056 --> 00:51:12,286
Higher? Oh, was it week 4?

1148
00:51:12,416 --> 00:51:13,066
All right.

1149
00:51:13,066 --> 00:51:14,866
Well, there's no week
3 for 1000 any more.

1150
00:51:16,066 --> 00:51:16,626
User error.

1151
00:51:19,036 --> 00:51:21,576
>> Week 0 for 1000.

1152
00:51:21,576 --> 00:51:23,966
>> David: Well 0 for 1000.

1153
00:51:24,026 --> 00:51:24,476
All right.

1154
00:51:24,856 --> 00:51:27,446
So, oh my goodness.

1155
00:51:27,906 --> 00:51:31,506
What is...this is really
not week 0 material, but ok.

1156
00:51:31,506 --> 00:51:34,476
What is the ASCII value
of the open curly brace?

1157
00:51:34,816 --> 00:51:41,606
[Laughter] No, funnier
is, who knows this?

1158
00:51:41,726 --> 00:51:42,176
Yes, students.

1159
00:51:42,406 --> 00:51:46,566
>> Cast, open curly brace.

1160
00:51:46,566 --> 00:51:46,633
>> David: Ooh.

1161
00:51:47,636 --> 00:51:49,256
>> No.

1162
00:51:50,216 --> 00:51:50,646
>> David: No?

1163
00:51:51,136 --> 00:51:54,306
Rejected, so that's
minus 1000 for students.

1164
00:51:54,306 --> 00:51:55,266
It's been rejected.

1165
00:51:56,756 --> 00:52:01,586
Audience? [Background
noise] 198?

1166
00:52:01,906 --> 00:52:03,816
Is that...90?

1167
00:52:03,816 --> 00:52:05,056
No? I don't think so.

1168
00:52:05,336 --> 00:52:06,266
Minus 1000.

1169
00:52:07,096 --> 00:52:08,556
[Laughter] Anyone?

1170
00:52:09,046 --> 00:52:09,856
Who wrote the question?

1171
00:52:09,856 --> 00:52:10,626
Come on, fess up.

1172
00:52:10,626 --> 00:52:12,616
>> One, two, three.

1173
00:52:12,896 --> 00:52:14,676
>> David: Oh, wait.

1174
00:52:15,416 --> 00:52:18,236
Huh? What's the answer?

1175
00:52:18,436 --> 00:52:21,616
123 is in fact...I'm not going

1176
00:52:21,616 --> 00:52:23,306
to throw correctly,
but here you go.

1177
00:52:24,326 --> 00:52:30,776
Wow. [Applause] Nice.

1178
00:52:32,016 --> 00:52:34,186
Um, yeah I think we
should take off the points.

1179
00:52:34,476 --> 00:52:36,136
Yeah, yeah, they were wrong.

1180
00:52:36,986 --> 00:52:38,656
So it's tied at 1000.

1181
00:52:38,656 --> 00:52:40,976
We have time for a couple more
questions in Single Jeopardy.

1182
00:52:40,976 --> 00:52:44,666
What would you like your
next category to be?

1183
00:52:45,336 --> 00:52:47,556
>> 1000.

1184
00:52:48,366 --> 00:52:50,486
>> David: Week 1 for 1000.

1185
00:52:50,486 --> 00:52:56,486
Your question here is,
oh...what does GCC stand for?

1186
00:52:57,306 --> 00:52:59,336
Greg's hand went up first
and then went down quickly.

1187
00:52:59,336 --> 00:52:59,536
[Laughter]

1188
00:52:59,536 --> 00:53:03,806
>> GNU Compilation
Compiler...GNU C Compiler.

1189
00:53:04,306 --> 00:53:04,606
>> David: Audience?

1190
00:53:05,676 --> 00:53:11,246
[Background noise] Did
you know that though?

1191
00:53:11,666 --> 00:53:13,936
Yes it's true, so,
1000, that is correct.

1192
00:53:13,936 --> 00:53:17,866
The GNU C Compiler, so extra
credit if you go figure

1193
00:53:17,866 --> 00:53:19,666
out what the GNU
stands for some day.

1194
00:53:20,286 --> 00:53:21,086
>> GNU's not UNIX.

1195
00:53:21,766 --> 00:53:23,616
>> David: Ok, you're
all very smart now.

1196
00:53:23,616 --> 00:53:24,486
All right.

1197
00:53:25,216 --> 00:53:27,186
Ok, staff is in the
lead by 2000.

1198
00:53:27,186 --> 00:53:28,996
We have time for one more
single Jeopardy question.

1199
00:53:28,996 --> 00:53:30,256
What's it going to be, staff?

1200
00:53:30,966 --> 00:53:31,736
>> Something 800.

1201
00:53:31,836 --> 00:53:33,236
Week 4, 800.

1202
00:53:33,236 --> 00:53:33,736
>> David: Oh sorry.

1203
00:53:34,366 --> 00:53:37,526
>> Week 4, 800.

1204
00:53:37,526 --> 00:53:37,726
>> David: What?

1205
00:53:37,726 --> 00:53:38,936
Week 4 for 800.

1206
00:53:38,936 --> 00:53:43,486
So week 4 for 800, and
your question's going

1207
00:53:43,556 --> 00:53:48,156
to be...week 4 for 800.

1208
00:53:49,156 --> 00:53:50,926
Blank. Week.

1209
00:53:51,056 --> 00:53:53,896
What? I do need help.

1210
00:53:53,896 --> 00:53:59,456
What, oh, what is the
name...we're going

1211
00:53:59,456 --> 00:54:00,436
to take today very seriously...

1212
00:54:00,536 --> 00:54:04,256
what is the name of the pointer
video we watched from Stanford?

1213
00:54:04,996 --> 00:54:07,116
[Laughter] I saw Rose's hand.

1214
00:54:07,966 --> 00:54:08,726
Yep?

1215
00:54:09,946 --> 00:54:11,726
>> Blinky's Pointer Fun?

1216
00:54:11,726 --> 00:54:13,226
>> David: Judges?

1217
00:54:13,226 --> 00:54:15,076
[Background noise]
Rejected for minus 800.

1218
00:54:15,616 --> 00:54:16,306
Students?

1219
00:54:17,926 --> 00:54:20,976
>> Fun with pointers?

1220
00:54:20,976 --> 00:54:21,616
>> David: No.

1221
00:54:22,676 --> 00:54:27,826
[Laughter] And the answer
was Pointer Fun with Blinky.

1222
00:54:28,076 --> 00:54:30,756
Who knows that?

1223
00:54:30,756 --> 00:54:31,836
All right.

1224
00:54:31,906 --> 00:54:35,226
So now we transition
to Double Jeopardy

1225
00:54:35,226 --> 00:54:37,516
where the scores on
the board double.

1226
00:54:37,776 --> 00:54:39,136
Why don't we take a moment

1227
00:54:39,136 --> 00:54:43,176
to ask students how's the
game going for you thus far?

1228
00:54:43,176 --> 00:54:45,636
If you'd like to step up and
field this kind of question.

1229
00:54:46,676 --> 00:54:48,056
What's your strategy
moving forward?

1230
00:54:48,486 --> 00:54:48,716
>> Sudoku?

1231
00:54:49,186 --> 00:54:51,216
>> David: What was that?

1232
00:54:52,666 --> 00:54:54,726
>> We'll just write some sudoku?

1233
00:54:56,356 --> 00:54:58,026
>> David: And, staff,
what's your strategy

1234
00:54:58,026 --> 00:54:59,296
for taking these guys down?

1235
00:54:59,326 --> 00:55:02,416
>> We're just going to
continue dominating, David.

1236
00:55:02,416 --> 00:55:04,566
I think this is working for
us pretty well thus far and,

1237
00:55:04,566 --> 00:55:05,846
you know, we're just
going to stick to it.

1238
00:55:05,906 --> 00:55:08,566
>> David: Yes, your $200
lead is massive here.

1239
00:55:09,206 --> 00:55:09,676
All right.

1240
00:55:09,676 --> 00:55:11,346
So, let's see.

1241
00:55:11,346 --> 00:55:13,906
I think the staffers
still in control?

1242
00:55:13,966 --> 00:55:16,726
So, staff, what's your
choice of weeks here?

1243
00:55:17,116 --> 00:55:17,976
New weeks on the board.

1244
00:55:18,516 --> 00:55:27,696
[ Background conversation ]

1245
00:55:28,196 --> 00:55:30,356
Yes, Matt, 2000 it is.

1246
00:55:31,926 --> 00:55:34,276
[Laughter] So, week 10 for 2000.

1247
00:55:34,396 --> 00:55:35,446
Oh, softball.

1248
00:55:35,446 --> 00:55:37,246
What does CPU stand for?

1249
00:55:39,176 --> 00:55:41,396
Jensu picked the students.

1250
00:55:42,176 --> 00:55:43,026
Ok, students?

1251
00:55:43,096 --> 00:55:44,666
>> Central processing unit?

1252
00:55:44,666 --> 00:55:45,036
>> David: Audience?

1253
00:55:45,036 --> 00:55:45,566
>> Yes.

1254
00:55:45,766 --> 00:55:46,216
>> David: Yes.

1255
00:55:46,216 --> 00:55:47,166
Very nicely done.

1256
00:55:47,166 --> 00:55:51,106
So now it's 3000 to 1200, Matt.

1257
00:55:51,426 --> 00:55:52,806
Students, what's it going to be?

1258
00:55:52,806 --> 00:55:55,366
Time for a couple
more questions.

1259
00:55:56,546 --> 00:55:58,416
Students? Oh, sorry.

1260
00:55:58,416 --> 00:56:02,736
What's it going to be?

1261
00:56:04,126 --> 00:56:07,106
The one with the...

1262
00:56:07,106 --> 00:56:08,356
[background noise].

1263
00:56:08,356 --> 00:56:09,806
Oh, you want to know
what this is.

1264
00:56:10,256 --> 00:56:11,516
Well, wait, I came prepared.

1265
00:56:11,516 --> 00:56:14,536
That's going to be an
audio daily double,

1266
00:56:14,536 --> 00:56:25,856
and that period is my clue
to myself to remember that.

1267
00:56:25,856 --> 00:56:26,556
[Laughter] Ok.

1268
00:56:27,106 --> 00:56:28,566
One moment.

1269
00:56:29,276 --> 00:56:32,226
Got to find...ummm.

1270
00:56:32,226 --> 00:56:36,216
Ok. For $1200, who
is...let's see.

1271
00:56:36,216 --> 00:56:37,206
This is the students.

1272
00:56:37,806 --> 00:56:38,676
Name this tune.

1273
00:56:38,776 --> 00:56:44,716
[Background noise] I think
the students get the chance

1274
00:56:44,716 --> 00:56:45,546
to answer this.

1275
00:56:46,206 --> 00:56:50,506
This is the Hamster
Dance for $1200.

1276
00:56:53,446 --> 00:56:55,416
All right we have time
for one more question

1277
00:56:55,416 --> 00:56:58,446
before...that's 1200.

1278
00:56:58,826 --> 00:56:59,296
All right.

1279
00:56:59,376 --> 00:57:01,056
Matt, it's time to dominate.

1280
00:57:01,436 --> 00:57:02,526
Students, you are in control.

1281
00:57:04,186 --> 00:57:06,306
>> Week 9, 2000

1282
00:57:06,306 --> 00:57:08,586
>> David: Week 9 for $2000.

1283
00:57:08,586 --> 00:57:13,166
In week 9, your question
is going to be...let's see

1284
00:57:13,166 --> 00:57:14,456
if we can pick a winner here.

1285
00:57:14,526 --> 00:57:17,196
Your question is going

1286
00:57:17,376 --> 00:57:22,096
to [laughter]...this is just
a question...this is just

1287
00:57:22,216 --> 00:57:23,136
an opinion.

1288
00:57:23,136 --> 00:57:25,796
Is the music played during
lecture breaks pseudo random?

1289
00:57:25,856 --> 00:57:27,116
Justify. [Laughter] Ok.

1290
00:57:27,116 --> 00:57:29,266
All right.

1291
00:57:31,066 --> 00:57:35,526
No, that's not the question.

1292
00:57:36,326 --> 00:57:42,506
The question will be...all
right...this person drew

1293
00:57:42,506 --> 00:57:47,396
pictures-very well, including
a toilet, a hammer, a tree,

1294
00:57:47,396 --> 00:57:49,806
a star, a rainbow, a lollipop.

1295
00:57:51,406 --> 00:57:52,096
That was a [laughter].

1296
00:57:52,646 --> 00:57:56,776
Ok. Glad you enjoyed the
first part of lecture.

1297
00:57:57,136 --> 00:57:57,606
All right.

1298
00:57:57,606 --> 00:57:59,316
Finally, week , what
are we in, 9?

1299
00:57:59,766 --> 00:58:01,416
So your question is going

1300
00:58:01,416 --> 00:58:05,456
to be...your question
for week 9...ok.

1301
00:58:05,456 --> 00:58:06,776
Perfect. This is quality.

1302
00:58:06,816 --> 00:58:09,896
Week 9. First hand
up gets it Ready?

1303
00:58:10,266 --> 00:58:11,876
How awesome is Ajax?

1304
00:58:12,336 --> 00:58:12,886
Max.

1305
00:58:13,116 --> 00:58:14,606
>> Max: Really, really
awesome, David.

1306
00:58:14,816 --> 00:58:15,266
>> David: Very.

1307
00:58:15,926 --> 00:58:16,396
[Laughter] That's ok.

1308
00:58:16,646 --> 00:58:26,416
Why don't we go ahead
and...why don't we go ahead

1309
00:58:26,416 --> 00:58:29,676
and officially adjourn
here after Double Jeopardy

1310
00:58:29,676 --> 00:58:32,486
because yeah...that just...yeah.

1311
00:58:32,606 --> 00:58:34,276
I think it's time for cake.

1312
00:58:34,276 --> 00:58:36,346
Congratulations on a
wonderful semester.

1313
00:58:37,866 --> 00:58:40,116
We will see you downstairs
in the pub

1314
00:58:40,116 --> 00:58:43,966
if you would like a snack.

1315
00:58:43,966 --> 00:58:44,033
[Applause]

1316
00:58:44,033 --> 00:58:53,000
[ Music ]

1317
00:58:53,516 --> 00:58:55,516
[ Background conversation]

1318
00:58:56,016 --> 00:59:03,006
[ Music ]