[elric]

Many parts of Khan Academy are great precisely because Sal is good at explaning things. In an engaging fashion, in clear language, with frequent exercises. It's benefited many people over the years (including myself).

Building a succesful learning platform which has impacted many students, certainly qualifies someone to have an opinion on education in my book. Would you be happier if he were some elected Minister Of Education -- who, from what I've seen, are generally about as qualified as a box of donuts?

Literally no one at a gym assumes that muscular people are experts at medicine. But it is reasonable to assume that they know a thing or two about building muscle ...