dudey

He's a junior now :-)

Speaking slower would make the videos much longer, which would lose viewership. I'm in favour of having the presenter talk quickly, thus making the video shorter. The words are all spoken clearly; it's easy to pause and rewind if you need to.

PSA: Don't feed the troll.

I think that python is the better choice for an in-person class, but building an in-browser js interpreter is a lot simpler than an in-browser python interpreter.

It's not Vi Hart doing the videos. See http://ejohn.org/blog/introducing-khan-cs/