Arach Tchoupani

Ruminating on what he called the "mind-blowing misallocation" of resources away from education, Gates touted the "unbelievable" 10- to 15-minute Khan Academy tutorials "I've been using with my kids." With admiration and surprise, the world's second-richest person noted that Khan "was a hedge fund guy making lots of money." Now, Gates said, "I'd say we've moved about 160 IQ points from the hedge fund category to the teaching-many-people-in-a-leveraged-way category. It was a good day his wife let him quit his job.