What started out as Sal making a few algebra videos for his cousins has grown to over 2,100 videos and 100 self-paced exercises and assessments covering everything from arithmetic to physics, finance, and history.

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Online Khan Academy

A lot of struggling math students have found comfort in the mathematical stylings of Salman Khan.

A few years back, Khan started creating videos to help tutor his cousin in math. Those videos became so popular, he quit his job with a hedge fund to work on them full time. Now his online Khan Academy offers more than 2,100 videos and attracts scads of teachers and students. And some adventurous school districts are trying to bring Khan's approach into the classroom.

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