Sal Khan only wanted to help his cousin with her math when he started posting educational videos online. Not too long after that, he began the Khan Academy. 11 years later, it has some 5 million ...

San Jose, California: Jesse Roe, a ninth-grade math teacher at a charter school here called Summit, has a peephole into the brains of each of his 38 students. He can see that a girl sitting against ...

Before he started the most popular education site on the Web, Salman Khan was neither an educator nor an entrepreneur. His outsider status helps explain why he's been able to solve a problem that ...

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