From a tiny closet in Mountain View, Sal Khan is educating the globe for free. His 1,516 videotaped mini-lectures — on topics ranging from simple addition to vector calculus and Napoleonic campaigns — ...

Opinions expressed by Entrepreneur contributors are their own. This may surprise you, but Sal Khan used to skip classes at MIT. They were too long and boring, he often thought, particularly lectures. ...

Forbes contributors publish independent expert analyses and insights. I focus on philanthropy, civil society, housing and the welfare state. Just eight years after its founding, Khan Academy has ...