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This first-hand account of the creation and rising popularity of Khan Academy was widely considered a highlight of TED.
Salman had started making math videos as a favor to his cousins, but they became so popular on YouTube that he decided to quit his job at a hedge fund and record thousands more videos across diverse subject areas. His intellect, light style and generosity have seeded a tremendous online educational resource.
See the Guide to TED Talks 2011.