By Jason Koebler, US News
America’s most popular teacher doesn’t work at Harvard University or a fancy prep school. In fact, he doesn’t work in a school at all, but his lessons have been viewed more than 56 million times. Salman Khan, a former hedge fund manager, is the founder of Khan Academy, a free online learning platform with a library of more than 2,300 videos covering everything from basic algebra and differential equations to the Vietnam War.
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