In the rapidly expanding field of online education, no one has matched the success of Salman Khan. After he started out tutoring his nephew online, the former hedge fund analyst built up Khan Academy, ...

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 — ...

NEW YORK — The original "Star Trek" series isn't just a milestone of science fiction, it's also a treasure trove of mathematical ideas — as Space.com discovered when we attended "Star Trek: The Math ...

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 ...