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[? ANGELIA: ?] Yeah.

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Hi, I'm [? Angelia ?]
from Jakarta, Indonesia.

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BRIAN: Nice to meet you.

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ANGELIA: Yeah.

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My question is, I see,
from the [INAUDIBLE],,

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that Brian and David are really
[INAUDIBLE] when they are teaching.

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So my question is how to develop such
[INAUDIBLE],, like public speaking

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and teaching CS combining and
[INAUDIBLE] and also technical skill.

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Thank you.

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DAVID: Well, thank you.

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You're too kind, I think.

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So one of the reasons I, at least,
went into teaching 20 years ago

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was honestly because I wanted to
get better at public speaking.

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As you may have heard me say in
one of CS50's classes, at the time,

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I had run for the undergraduate
council at Harvard,

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or the student government, if familiar--
student council at this school--

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just kids that generally try
to accomplish goals on campus.

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And I ran for this election
and lost miserably.

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I did not win the election.

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And part of that, I do
think, was because I

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was very ineloquent at the time.

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I had trouble conveying my ideas.

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I performed very poorly in
one of the on-campus debates.

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And so I was really angry at myself
that I wasn't better spoken at the time.

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And so I started
volunteering as a teacher

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for one of the undergraduate
student groups that

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allowed me to teach
classes to other students,

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like HTML, and CSS, and
other such technologies.

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I then was a teaching fellow,
or teaching assistant, my fall

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of my senior year of university.

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And then I was fortunate to
be able to teach my own class

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spring of my senior year.

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And so it really, honestly, was
just practice, practice, practice.

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And teaching, particularly, really
helped me organize my thoughts,

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allowed me an opportunity,
again and again,

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to try to communicate
clearly to other people,

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more so than if you're just giving a
speech or just presenting in a class.

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Having to teach, I think,
was really a key ingredient.

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And I think it helped,
technically, that I just

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enjoyed what it was I was teaching.

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I really enjoyed programming.

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I really enjoyed computer
science on the whole.

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And so being able to
teach something I was

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passionate about just really helped.

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Brian, what was the case for you?

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BRIAN: Yeah, I think I would
agree with just about all of that.

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I think that practice is the key thing
that helps make you a better teacher.

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Just getting experience, even if it's
just explaining something to a friend

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or to a peer--

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that helps you to start
to think about how

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to take the ideas that
might exist in your head

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and put them a little bit
more precisely into words,

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and, in particular, to be
able to explain something

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in a way that is accessible to someone
who hasn't seen the topic before.

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But I often think
about, when I was first

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learning some of the material, the types
of explanations that worked and didn't

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work for me, and trying to
come up with explanations

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that can help to explain
very technical topics

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but, hopefully, in a bit
of an easier-to-understand

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and more accessible way.

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And it definitely helps that
the topics that I get to teach

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are things that I find
really interesting.

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With the artificial intelligence class
that was released this month on edX,

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I had a lot of fun preparing
that class and thinking

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about what topics I wanted to
cover, because [INAUDIBLE] all

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topics that I personally find very
interesting and exciting in computer

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science right now.

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And so the opportunity to be
able to teach about those topics

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and to talk them through in a lot
of detail, I found very exciting.

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And so I hope that does
come across in the classes.

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And I'm glad that you've
been enjoying them.

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