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DAVID MALAN: CS50 was recently visited
by Presley Alexander, an 11-year-old

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who's actually been taking CS50 online.

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In fact, here is the video that Presley
submitted as part of her problem

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set zero wherein she says, hello world.

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PRESLEY ALEXANDER: Hello world,
I'm Presley, a 10-year-old girl

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from Denver, Colorado, and I have been
using scratch for a couple of years

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now for both programming
and doing animations,

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as well I've been taking a
couple other courses on languages

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like JavaScript and Python.

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But they are really focused
on language, and not

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generally thinking like a programmer.

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And that's why I'm loving CS50 so much,
and we're just starting week zero,

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but I'm already loving it
so much, and I'm really

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glad to continue to
take the entire course.

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I'm really thankful that courses like
this are available to kids like me

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all around the world and I can
take the next step to being

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the next generation of women in STEM.

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I'm Presley, and this is CS50.

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DAVID MALAN: Now, it turns out
Presley is homeschooled whereby

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she takes classes at home with her
parents, and as part of her lessons

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she has been filming a short video
and putting it online every day

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for the past four years.

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In fact, one of the video she
shot was about CS50 itself.

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PRESLEY ALEXANDER: Hey everyone, it's
Presley at actoutgames.com, here.

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And today I'm going to be
talking a little bit about CS50,

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or more specifically, CS50x,
which is edX's online CS50 course.

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So you might have seen
yesterday we just posted

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this random video which was
just me saying, hi to you

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all the people in CS50.

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And I'm going to talk a little bit about
why that just got posted yesterday,

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like completely out of context.

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Just, hey, am welcome to CS50.

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And you guys were
really pretty confused.

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To start off CS50 is a really, really
great intro to computer science course.

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And edX, which is basically just
this place where you can take courses

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online-- like Coursera
and places like that--

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has been running the CS50 for a while.

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And CS50 used to just be like Harvard's
intro to computer science class,

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and that was on edX for free so
we got it, so people like us,

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we guys-- so people like us
could go and take that course

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and learn about computer science.

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But what really cool this
year is it's actually

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Harvard and Yale's intro to a computer
science course, which is really, really

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cool because now there's two of these
really cool schools collaborating

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on this intro to computer science
course, which I'm really excited about.

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And this is one of the
reasons why we homeschool,

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because we have access to
all these amazing resources

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with these amazing teachers
like David who's teaching CS50,

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and we're not stuck
with the local teacher

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at the local school, which I'm
sure most of the local teachers

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are pretty amazing, but we can still go
and get these really amazing teachers

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and take Harvard and
Yale's CS50 course at home,

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which would be really difficult
to do if I wasn't homeschooled.

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So it's definitely really great to
have access to such amazing teachers

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online, and not just being
stuck with the local people.

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A lot of times when people are
going to make an online course they

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just take what they're doing in
classroom and they record it,

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and then they put it online.

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And sometimes it works really well,
but most of the time it doesn't.

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So in CS50x they're doing it really
well, they're doing it right.

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So they do have the
lectures entirely recorded,

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and lectures are great, and really
interactive, and entertaining,

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and they're really, really fun to watch.

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So you can watch the lectures and
feel like you're in a lecture hall--

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and you're watching those
lectures-- but they also

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have these online videos, so you
can both attend the lectures,

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but the lectures mentioned
things you can do in person

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and that you can do
online, but they come

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with these little extra
online videos and all sorts

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of little tidbits of things that
you can put on that is online.

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And they're doing it right, to
really bring the course online

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instead of just having some of the
things in the course that they're

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doing in the classroom, and
then just putting them online.

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They're making it really
interactive and great

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for the people that are watching
it through their computers.

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So I actually just finished
week zero, most of that

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was because the problem set for week
zero was to make scratch program,

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and some of you know
I've been on scratch--

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I've been scratching
for about two years now.

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So I could not just make something
simple, like you click on the cat

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and it bounces around a little
bit and asks you some questions.

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I couldn't do that.

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So I actually worked really
hard, I put about-- if you

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took all the I was sitting on
the computer it would be five,

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six hours over the course
of a couple of weeks.

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I worked really, really
hard on it so I'd really

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appreciate it if you guys
went and checked it out

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because I worked really hard on it.

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There'll be link in doobly-doo.

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I hope you like it
because I worked so hard.

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So we're actually just starting
week one like I said, and we're

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learning a little bit of C, and
what I really love is about the way

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they're teaching C. They're not just
teaching the syntax of C and like,

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OK, this command does this, and
then moving on to the next command.

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They're teaching the
concepts and what everything

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means, and why of doing this.

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So they're teaching the syntax,
they're teaching what the syntax means.

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And your teaching the
concepts, like the loops,

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and the Booleans, and all
sorts of stuff they're

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teaching, that I'm familiar with, but
in colored block puzzle piece form.

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And I just want to say,
scratch is actually--

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if you're moving from
scratch to C, you're

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going to be really surprised at how
much C actually looks like scratch.

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Scratch basically just
it more like a shape

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and put some text
instead of the language.

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They look pretty similar actually.

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But it's just so amazing,
and it's such a great way

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to teach programming, because
once you are in the basic concepts

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you just have to learn some syntax
and you can program in any language,

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really.

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So you can start programming
in pretty much any language

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once you learn the concepts behind
these, which is just such a great way.

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So like I've said many times, we
actually just finished week zero,

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so we are going to try and go
through it as quickly as possible.

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We're still going to take our
time and put lots of effort

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into the problem sets as
well, so we're not just

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going to do something really quick
that can be done in like 10 minutes.

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We're going to work and put
time into the problem set.

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And I just want to say, if you
want to get started with CS50,

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don't just wait until next year when
it starts all the way over again.

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Go ahead and join now.

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You can do it any time
of the year, really.

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So please join it if you really are
interested in learning computer science

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because it's such a
great way to teach it.

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We'll post more updates as we go
through it, and if some of you guys

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are also taking it we can help
each other with problem sets,

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and talk about concepts that
we learned, and stuff together,

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which will be a really great
interactive experience.

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There'll be a link to edX and
the CS50 course in doobly-doo

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so you can sign up and take
it if you're interested.

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So a huge thank you to
edX, and Harvard, and Yale,

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and David performing the stuff
online and making such a great intro

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to computer science course that I
am having so much fun with so far.

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If you want to keep up with
how we're doing on the course

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as well as keep up with some
other things that we're doing then

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please, please subscribe.

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It really helps us out.

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So yeah, thank you for watching
and I'll see you Tomorrow.

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Bye.

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DAVID MALAN: To see Presley's own
YouTube channel head to this URL here.

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This was Presley Alexander,
and this was CS50.

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