Sal Kahn has gone from a successful career as a hedge-fund analyst to creating an "academy" that has six million visitors a month viewing his academic videos on everything from algebra to French history. Even Microsoft co-founder Bill Gates has been impressed.o:p>
"At 3,000 lessons online, Sal's personal ability as a teacher is remarkable," Gates said in this USA Today profile of Kahn. "Bringing this kind of creativity and new assessment tools for teachers could make a profoundly positive different in education."o:p>
Kahn talks about his Academy an dhow it started in this video.