WEBVTT
X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000

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>> [MUSIC PLAYING]

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RAMON: Hello, world.

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This is CS50 Live.

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I'm Ramon Galvan, filling
in today for David--

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>> DAVID: Who's lost his voice.

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>> RAMON: Today, he'll be the Andy
Richter to my Conan O'Brien.

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As we tour Harvard campus
today, blow glass today.

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But first--

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>> DAVID: And so, so much
more in today's episode.

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But first, a look at
a recent field trip.

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>> RAMON: Recently, this past weekend,
we took a trip to St. Louis

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to be visit LaunchCode for
the first ever CS50 Hackathon

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outside of Cambridge.

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And our own Shelley Westover has
put together a little scissor reel

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to show you what happened.

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>> DAVID: Let's take a look.

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>> SPEAKER 1: So I'm here to announce
today that David Mayo and a team of 12

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educators from Harvard
University are coming

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to St. Louis, Missouri on March 28.

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>> DAVID: We are so pleased to announce
the first ever CS50 Hackathon, that

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will be going on the road to St. Louis.

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>> [MUSIC - AMERICAN AUTHORS, "BEST DAY OF
 MY LIFE"]

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>> SPEAKER 2: Woah, that was a
lot faster than I expected.

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SPEAKER 3: Shelley's driving the bus.

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Oh, super wet.

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Wait.

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Second thoughts.

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I'm going.

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I'm not looking back.

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Oh no!

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Damn it!

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It's all over.

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DAVID: And what you all have
been waiting for here tonight

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is our first ever
on-the-road CS50 Hackathon.

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>> [CHEERS]

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[INAUDIBLE] put faces to
the YouTube views, I guess.

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[LAUGHTER]

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SPEAKER 4: And this is CS50,
and this is LaunchCode STL.

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DAVID: The ultimate goal is
to get to at least midnight,

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at which some excellent
donuts will be served.

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And we'll be here a
bit longer after that,

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but you should be proud if you can make
it all the way we to midnight tonight.

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>> SPEAKER 5: 200 or so
people are here tonight,

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and we're all really excited
to be a part of Harvard's CS50

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and have you part of our city.

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Glad to have you.

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SPEAKER 2: End on a joke.

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SPEAKER 6: What's the first
sign of a nosy pepper?

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It's jalapeno business.

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SPEAKER 2: Hey, Chad.

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They don't love you.

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Sorry, bud.

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>> RAMON: You may also recall
from last time, code.org.

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A non-profit that has
been getting everyone

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excited about computer science.

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And it turns out that founder Hadi
Partovi was actually a former CS50 TF,

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and he wants to say hello.

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>> HADI: Hello, world.

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My name is Hadi Partovi.

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I run an organization called code.org.

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We're best known for our
Hour of Code Campaign.

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That's something we launched for
the first time last year in 2013,

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and the last three
months the Hour of Code

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has already reached 30 million students,
showing that computer science is

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something that is applicable and
something that anybody can learn.

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It's useful whether you want to become a
doctor, a lawyer, an astronaut, or even

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the president.

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>> And those of you who are
learning it in CS50 today,

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you're learning things like how
to write a for loop or repeat

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loop, an if-then statement, or
how to program your own functions.

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These are concepts that
anybody can learn, and are

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fundamental to how all of
computing around us works.

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>> I myself was a CS50 TF when
I first went to Harvard.

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So it's exciting for me to
record this video for you all.

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So enjoy yourselves.

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This is CS50.

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>> RAMON: You may also know that Mark
Zuckerberg, created the Facebook

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back in his college dorm room.

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This is how it originally looked like.

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Also, you may not know that
the original URL was not

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the Facebook or Facebook.com.

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>> DAVID: No, rather, it was this one here.

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>> RAMON: Roam.175-29.student.harvard.edu.

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DAVID: Which was the host name of
Mark's computer in his dorm room.

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And in fact, pictured here is Mark
with Chris Hughes and Dustin Moskovitz,

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two of the students with whom he
went on to found Facebook itself.

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Now, Mark comes back to campus from
time to time, and in fact, in 2005,

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he visited CS50 with Professor Micheal
D. Smith and gave a guest lecture.

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In fact, if you look really closely,
you can see Mark down up front.

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But let's take a look at a clip.

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>> MARK: Wanting to look people up, I
think, is kind of a core human desire.

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Right?

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I think that people just want to
know stuff about other people.

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So I think that providing an
interface where people could just

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type in someone's name and get
some information about them

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is generally a pretty useful thing.

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So growth has been pretty good.

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>> It was tough to figure out
exactly how to gauge it,

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because when we did college,
we opened it up at Harvard.

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Then we opened it up at a couple
of colleges around Harvard.

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And the idea was always, we are
really short on money and equipment,

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so while getting as little as possible,
we want to maximize our growth.

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So we want to launch
at the schools that we

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think are going to grow the
quickest based on the fact

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that the people at those schools
are going to have the most

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number of friends at the
schools that we're already at.

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We took a different
approach for high school,

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because we could just launch
it everywhere at the same time.

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So we didn't really know
how it was going to grow.

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I think it's growing at more than 5,000
people a day, which is pretty good.

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>> RAMON: For the full
lecture, click on this link.

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>> DAVID: But not yet.

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You can get the full hour of
Mark's talk there on the internet.

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>> RAMON: And now, let me introduce a
current Harvard undergraduate, Sean,

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who wants to give you at
tour of Harvard's campus.

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>> SEAN: Hi there.

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My name's Sean and I'll
be your tour guide today.

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Originally hailing from New York
City, I'm actually now a sophomore

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living Cabot house-- best house--
concentrating in neurobiology

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on the mind-brain behavior
track, with a secondary

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in visual environmental studies
on the film production track.

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Welcome to Harvard.

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>> Hi there.

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Welcome to the Science Center Plaza.

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It's said that over 10,000 people
will come through these doors

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every single day, because
there's a large number of things

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you can do in it.

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So one of the things I love
about the Science Center Plaza

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is that during the summer, it
becomes even more of a hub.

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Because we have all of
these food trucks that

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line up from all different
places in Boston.

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And in addition, we
have crafts fairs, we

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have a weekly petting zoo, we have
chessboards and bean bag chairs.

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So everyone loves to come out,
whether to do homework or just chat,

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or just grab a bite to eat.

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>> So looking over here now, we
have Memorial Hall Complex,

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which is exactly where
CS50 lectures are held.

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So if you want to follow me to our next
stop, we'll talk more about it there.

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>> So welcome to the inside
of Memorial Hall Complex.

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Now, there's some really cool
things about this building

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that you can see right here.

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First thing you notice is
all of that stained glass.

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This building actually contains
the second largest amount

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of secular stained
glass in North America.

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Now why?

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This place was actually founded
in 1870 as a war memorial,

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commemorating the lives lost of Harvard
undergraduates who fought for the Union

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during the Civil War.

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>> Now, this building is
filled with history.

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But it's also filled with
a lot of cool other things.

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Some of you may recognize this building.

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It's actually the place where
CS50 lectures take place.

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So this is actually just outside
of Sanders Theatre, where

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David Malan actually gives his lectures.

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This space is really cool because
it's actually three functions.

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>> First, there's Sanders Theater.

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But also, below us, there's a bunch
of classrooms and rehearsal rooms.

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And just over that wall is the freshman
dining hall, which looks like Hogwarts.

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If you don't believe me, Google it.

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>> But in any case, back to Sanders.

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So by day, we all know it
as where CS50 takes place.

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By night, this place is also
an incredible auditorium

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for a large amount of concerts, run not
only by students but famous performers.

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For instance, Wynton Marsalis.

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Last year, we actually had
Matt Damon as the recipient

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of the Arts First Medal of Honor.

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And then this year, we
actually have Margaret Atwood.

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>> So there's a lot of awesome things
about having a space that's not only

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driven for academics, but also for
your extracurricular activities.

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>> RAMON: Now this week in tech news.

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DropBox has made quite a fuss lately,
but I know nothing about this.

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>> DAVID: Well, at least
this tweet went out

00:10:04.880 --> 00:10:06.670
of late, which you
wouldn't mind reading--

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>> RAMON: Wow, @DropBox.

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DMCA's take down in personal folders.

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This is new to me.

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>> DAVID: So DMCA, for those unfamiliar,
is the Digital Millennium Copyright Act.

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And this is a US law that essentially
governs the use and sharing,

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or prohibition of sharing,
of copyrighted materials.

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Now it turns out, this
is actually nothing new.

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Even though the internet was a
bit abuzz with this story of late.

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DropBox does indeed
analyze the files that you

00:10:29.670 --> 00:10:33.670
have in your DropBox if you attempt
to share a file, like a movie that's

00:10:33.670 --> 00:10:36.210
copyrighted, or song that's
copyrighted, or the like.

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>> Because if a company or movie
studio determines, wait a minute.

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That is our movie, or
that is our song, they

00:10:41.430 --> 00:10:44.260
can let DropBox know by
sending this take down notice.

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DropBox then computes what's called a
hash, which is a unique identifier that

00:10:48.112 --> 00:10:50.070
looks like a sequence of
characters and numbers

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that, with very high
probability, uniquely

00:10:52.290 --> 00:10:54.170
identifies that particular file.

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They then add that hash to
a blacklist, and any time

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they notice you or me or
anyone on the internet trying

00:10:59.030 --> 00:11:03.160
to share that same file, whereby that
same file presumably has the same hash,

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they disallow it.

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>> So this is a very common approach.

00:11:06.110 --> 00:11:07.860
This has been done for some time.

00:11:07.860 --> 00:11:10.719
It doesn't mean that DropBox
is snooping around your files.

00:11:10.719 --> 00:11:12.760
It doesn't mean that
they're deleting your files.

00:11:12.760 --> 00:11:16.010
It simply means that if you're trying
to proactively share a file that someone

00:11:16.010 --> 00:11:20.182
has claimed ownership of, they
will clamp down in that case.

00:11:20.182 --> 00:11:21.390
RAMON: That was all above me.

00:11:21.390 --> 00:11:24.820
But what wasn't, recently,
we also had an opportunity

00:11:24.820 --> 00:11:28.960
to visit Third Degree Glass Factory,
founded by LaunchCode and Square

00:11:28.960 --> 00:11:31.400
co-founder, Jim McKelvey.

00:11:31.400 --> 00:11:35.580
>> DAVID: So, it turns out that the Third
Degree Glass Factory was actually

00:11:35.580 --> 00:11:38.150
inspiration for Jim's company, Square.

00:11:38.150 --> 00:11:41.000
So Jim is quite the artisian
when it comes to making glass.

00:11:41.000 --> 00:11:43.510
And he actually created
these beautiful faucets out

00:11:43.510 --> 00:11:46.120
of glass in the glass
factory's bathroom.

00:11:46.120 --> 00:11:49.360
Now as the story goes, a
couple came in some time ago

00:11:49.360 --> 00:11:52.807
and asked if they could purchase
such faucets for their own home.

00:11:52.807 --> 00:11:56.140
Jim, at the time, wasn't able to process
credit card companies from these folks,

00:11:56.140 --> 00:11:58.450
and thus was born the
inspiration for Square,

00:11:58.450 --> 00:12:01.850
a company that now allows you to
do exactly that by swiping a credit

00:12:01.850 --> 00:12:05.530
card on your, for instance, iPhone
with which to process payments.

00:12:05.530 --> 00:12:06.700
>> RAMON: I have a flip phone.

00:12:06.700 --> 00:12:11.475
And now, 60 seconds of
David blowing glass.

00:12:11.475 --> 00:12:14.954
>> [MUSIC - THE BLACK KEYS, "EVERLASING
 LIGHT"]

00:13:10.700 --> 00:13:12.700
>> RAMON: And now, some work
from your classmates.

00:13:12.700 --> 00:13:15.970
You may recall this,
from Pset 4's Breakdown.

00:13:15.970 --> 00:13:17.110
>> DAVID: Breakout, in fact.

00:13:17.110 --> 00:13:20.400
Which uses the Sanford Portable
Library, a graphical user interface

00:13:20.400 --> 00:13:22.180
with which you can make games like this.

00:13:22.180 --> 00:13:25.802
It turns out, you may remember
a game like this from 1989.

00:13:25.802 --> 00:13:27.417
Let's take a look.

00:13:27.417 --> 00:13:30.399
>> [VIDEO GAME SOUNDS]

00:13:43.960 --> 00:13:46.470
>> DAVID: Now upon completing
Pset 4, one of your classmates

00:13:46.470 --> 00:13:48.140
had this to say on Facebook.

00:13:48.140 --> 00:13:52.470
>> RAMON: More than 20 years ago, I bought
this similar game, "Alleyway", for $25.

00:13:52.470 --> 00:13:54.284
I can't believe I've created it.

00:13:54.284 --> 00:13:56.950
DAVID: Now you may also recall,
recently we headed down the road

00:13:56.950 --> 00:13:59.130
to MIT's Media Lab where
our friends John Maloney

00:13:59.130 --> 00:14:03.020
and Mitchell Resnick, creators of
Scratch, kindly sat down for a chat

00:14:03.020 --> 00:14:03.520
with us.

00:14:03.520 --> 00:14:05.228
At the time, they gave
us a sneak preview

00:14:05.228 --> 00:14:07.630
of Scratch Jr., a new
version of Scratch,

00:14:07.630 --> 00:14:10.490
in development, that's targeted at
students even younger than those

00:14:10.490 --> 00:14:12.545
for whom the original
Scratch version was born.

00:14:12.545 --> 00:14:15.170
Now, the media lab is in the
process of doing a bit of campaign

00:14:15.170 --> 00:14:17.820
to raise support for the
continued development of Scratch

00:14:17.820 --> 00:14:20.260
Jr. In fact, among the things
they are hoping to do--

00:14:20.260 --> 00:14:22.820
>> RAMON: Is release an
iPad version this year,

00:14:22.820 --> 00:14:25.470
hoping to release an Android
version later this year,

00:14:25.470 --> 00:14:28.685
and develop resources in curricula
for teachers and students alike.

00:14:28.685 --> 00:14:30.560
If you'd like to contribute
to this campaign,

00:14:30.560 --> 00:14:33.610
do just head to this
Kickstarter URL here.

00:14:33.610 --> 00:14:36.170
Or, for more information,
take a look at this clip.

00:14:36.170 --> 00:14:46.730
>> [MUSIC PLAYING]

00:14:46.730 --> 00:14:48.650
>> MARINA: We're working
on Scratch Jr., which

00:14:48.650 --> 00:14:51.340
is a programming language for
young kids, specifically designed

00:14:51.340 --> 00:14:53.005
for five to seven-year-olds.

00:14:53.005 --> 00:14:56.810
And it's designed with them in mind,
so it's developmentally appropriate.

00:14:56.810 --> 00:15:01.750
And children can create animated
stories, interactive games, collages,

00:15:01.750 --> 00:15:05.410
or anything they imagine.

00:15:05.410 --> 00:15:08.325
>> SPEAKER 7: I like Scratch
Jr. because there's

00:15:08.325 --> 00:15:12.430
so many programs that you could make.

00:15:12.430 --> 00:15:14.864
>> SPEAKER 8: It's like you
can make your own movie.

00:15:14.864 --> 00:15:19.480
>> SPEAKER 9: You basically get to make
your own game and do it yourself.

00:15:19.480 --> 00:15:21.120
>> SPEAKER 10: Do you know what that does?

00:15:21.120 --> 00:15:22.120
SPEAKER 11: No, tell me.

00:15:24.720 --> 00:15:26.864
>> SPEAKER 10: It makes it wait 50 seconds.

00:15:26.864 --> 00:15:27.530
SPEAKER 11: Wow.

00:15:27.530 --> 00:15:29.742
How did you know?

00:15:29.742 --> 00:15:32.157
>> SPEAKER 10: Because the clock.

00:15:32.157 --> 00:15:34.100
And it's set to 50.

00:15:34.100 --> 00:15:36.450
>> MARINA: We design Scratch
Jr. to match the development

00:15:36.450 --> 00:15:37.840
abilities of young children.

00:15:37.840 --> 00:15:41.530
We look at cumulative social
personal capabilities,

00:15:41.530 --> 00:15:44.290
and we design the
features of Scratch Jr.

00:15:44.290 --> 00:15:46.230
To match what young children can do.

00:15:46.230 --> 00:15:49.370
We work with teachers, we work with
children, we work with parents.

00:15:49.370 --> 00:15:52.400
And we observe what they were able
to do, what they were not able to do,

00:15:52.400 --> 00:15:56.070
and we went back and redesigned
Scratch Jr. many, many, many times

00:15:56.070 --> 00:16:00.430
so we can really be a
tool for young children.

00:16:00.430 --> 00:16:01.960
>> RAMON: That's it for CS50 Live.

00:16:01.960 --> 00:16:04.780
Thanks to all the contributors
and the staff behind the camera.

00:16:04.780 --> 00:16:07.800
>> DAVID: Thanks so much to Ramon
for filling in for my voice today.

00:16:07.800 --> 00:16:13.245
>> RAMON: This was CS50, and this
is 12 programmers blowing glass.

00:16:13.245 --> 00:16:16.165
>> [MUSIC - AMERICAN AUTHORS, "BEST DAY OF
 MY LIFE"]

00:17:10.058 --> 00:17:11.849
SPEAKER 12: And that's
how you make a bowl.

00:17:11.849 --> 00:17:14.470
This CS vickvee-- Ah!

00:17:14.470 --> 00:17:15.839
And now I made the blooper reel.

00:17:15.839 --> 00:17:18.584
Fantastic.

00:17:18.584 --> 00:17:44.427
>> [MUSIC PLAYING]