Have you ever heard of “Khan Academy”? A dozen years ago Sal Khan, a Massachusetts Institute of Technology–trained engineer with a knack for explaining math and science, used an internet drawing tool to tutor his 12-year-old cousin in algebra. When he posted videos on YouTube, they attracted a global audience in the tens of millions. This was how self-education started from the Internet. Now Khan is tackling something perhaps even harder: reimagining how children are taught in bricks-and-mortar schools.
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