I think the Khan methodology works very very well for elementary math, and I'm a huge fan of the automatically-generated practice problems. These are more valua

I think the Khan methodology works very very well for elementary math, and I'm a huge fan of the automatically-generated practice problems. These are more valuable than the videos IMHO. It's valid to point out that other subject matter may not be well presented by this kind of approach. On the other hand, it's early days. So fast-forward 20-years when you can download a video-game from Khan Academy that will teach you about Vietnam or the Korean war that is exhaustively researched and curated by a hobbyist and veteran (from both sides) community. Imagine downloading an interactive demo that shows that even if you target an airstrike to within 1m in an urban area, fragments will travel 500 m into neighbouring apartment blocks. That would be better than kids learning their military history from CoD.