The only thing I like better than teaching is learning.
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Sal Khan: What Khan Academy is most known for is there's a library for about 2,500 videos. Right now they're all made by me in English, although we are translating them, and they're everything from basic addition all the way to vector calculus and the French Revolution. And there's a video on the debt ceiling, [ laughs ] so a very comprehensive set of videos, and we keep add -- I keep adding more right now. But we've augmented it now that we've gotten funding this past year with an exercise platform, and it's an exercise platform that -- I'd actually written a primitive version of it for my cousins many of years ago, actually before I'd even made the first video, but I didn't have the bandwidth nor the talent to properly do that justice. And so when we got funding, I said, "This is where I think a lot of the meat is is actually giving people exercises and feedback and letting the videos complement that".