Name: Office Hours with David and Brian - 25 March 2020
Uploaded: 2020-03-28T17:12:56.000Z
Duration: 1 h 6 min 25 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

The imperative

well, go ahead and dive into the Q and a portion of today, so here it harbored office hours are.

Modal verbs - A2

And here are the results, which you should now see on your screen, particularly down toward the bottom for all of the courses.

There an opportunity for students to drop by professors offices for an hour and just talk about the class?

Talk about how life is going, any questions they might have about academics in the real world.

So even though we're all in just a virtual office today, the goal is just to interact and chat a bit about topics enter on your minds.

Let Brian and I just asked that if you have questions that are specific to a problem set or a project like code, let's answer those on slack or on discord or on Ed or some other tool, because I don't think we could do a very goodjob debugging.

People's code live on video here today, so let's focus more on concept without further ado.

Why don't we go ahead and start the questions and answers?

Your hand is up first you want to go ahead and amuse yourself and ask a question of the group.

I actually have a couple of questions I've have to want to ask.

But right now, the most pressing question I'm curious about is really mostly about security.

I sometimes stream my coding sessions online.

And like some some of my developer friends and coffee shops tell me, Don't stream your coat on.

Nine was like Everyone sees her secret key.

Andi, I'm just wondering what one of the typical conventions to two to basic security management for for during development or doing a post development for managing APS.

Our What should I even do to find you get nto network security, cyber security or with python?

Or like if I have some analytic skills with five phone and so on and so forth?

Why don't I answer the first part and in turn, in the latter part over to Brian.

So if you are live streaming your code and with it your secret keys on the Internet, don't that is bad like that?

You answered the question yourself already.

If you recall if you'd taken CS 50 your CS 50 Web, you might recall that any time we dealt with secrets like a P I keys, we would encourage you to put them into what are called environment variables, which put them into the computer's memory.

But in a place where it's not in your code, which means people on the Internet can't see it if you're live screaming and you don't accidentally therefore push it to get hub or save it in your code repositories if you're using version control.

So generally speaking, anything you put in your code really shouldn't be that sensitive.

You should not have passwords, not secret keys or the like.

Use some other mechanism for those as for python itself in security practices and learning Maur Brian, you want to take it from there?

If you're interested in learning more about security that the domain had suggest looking into is the whole world of cryptography, which is this very sort of vast discipline within computer science.

All about trying Thio communicate things securely, which is becoming very, very necessary in the context of the Internet, where you want to be able to send messages to someone across the Internet.

You want to do so securely so that nobody in the middle is going to be able to access whatever information you're trying to send him.

And there are a whole bunch of now algorithms and libraries that exist in languages like Python that might be worth exploring there.

And this is this kind of cryptography is the basis for how communication over the Internet works.

It's the basis for how crypto currencies like Bitcoin work if you're familiar with preferred of bows.

And so a lot of applications now of these cryptographic techniques and we talk about these a little bit and see a 50 the Web programming class, but definitely a lot more there to explore.

Wonderful Well, thank you for that question.

Can we go next to let's say, uh, more Moritz, if I'm saying it correctly, Uh, yes, Hello.

So, um, I started out programming with CS 50 X and, well, our university semester is kind of on hold now because of the whole Corona virus situation.

And I've long considered the CS 50 ex in particular to be the master class when it comes to like a teaching programming with in an online kind of environment.

And I'm sure that a lot of work has gone into getting it up to that level.

And I'd like you to share with us some of the insights that you had going through developing this like online course and all of the material and what perhaps other educators could take away from it to improve their own materials.

First of all, I can say that it's been very incremental over the years what we've done with CS 50 and I think what you see now is really the aggregate effect of a lot of efforts by myself by people like Brian by other members of our team over the past 13 years now since I took over the class and I think the simplest answer from the get go is that we set out some time ago, really, just to solve a problem.

So back in 2004 or so, I was teaching a different class at Harvard's Extension School, which is our continuing education program for adults, primarily both on campus and off, and that the time heartburn was using video technology called real video, if any of you remember it, it was one of the earliest streaming video formats.

It wasn't that great, but it was still cutting edge nonetheless at the time.

But it didn't allow you to save the videos locally.

It didn't allow you to take the videos with you.

I think the first iPod came out, give or take, and podcasting became a term.

It was interesting to us that we could allow our students in that class to maybe download these videos or even MP three's audio recordings of them, and then take them with them on the train.

What toe work to the gym on the treadmill.

And so we really started doing everything on the Internet just for our own students.

But I did a whole lot of people around the world start tuning in, which was a pleasant surprise to us.

And then in the years since then, did we very consciously start making sure that any materials we creates are digitally accessible as well.

D efs and this is handouts, and it's a software and everything else, and we also became more sensitized to internationalization.

So very early on, we would ask questions about American sports or even U.

S currency, which, of course, if you're living abroad like many of you are you might not have those same experiences or backgrounds.

And so I think in recent years to we've tried to be more culturally sensitive and geographically sensitive to students disparate backgrounds and not assume anything.

And so now we still have a problem set you might recall on cash a greedy algorithm, but we define for everyone what a nickel is, what a dime is and so forth.

And then lastly, I think I would propose that it's thanks to members of our team, one of whom is cut fuel from actually are on this video call with us today in and are thorough and Ramon we have this amazing team focusing on videography, and we now scream in widescreen four K video.

I think all of us take pride in what we're doing.

And the goal is not to have, ironically today small little video streams of people normally but media that really draw the students in and make education as engaging, if not entertaining, as possible.

I mean, I spent 18 plus years in high school and and prior, not really loving school.

I sort of worked hard just because I thought I should.

But I don't think school needs to be this obligatory thing.

And so we've tried to create, We hope, an environment that draws folks like yourself in Thank you for asking.

How about from looking for some blue hands?

Uh, Debashish, if I'm pronouncing that rights against the green screen still muted?

Yes, we can hear, um, a lawyer from your true I want to know.

Uh, is there any more pictures you polo from Elect a few fulcrum.

But we can get up from the Internet like I'm from India.

And I follow your your toe Berrios and see if the collectors Hello?

Okay, I know you're seeing live just on Get Jennifer just some more.

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Office Hours with David and Brian - 25 March 2020

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