Instead of teachers using classroom time to deliver lectures, students are assigned to watch Khan Academy videos as homework, so that class time can be spent solving problems (also provided by Khan) and getting points along the way (ten correct answers earns them a merit badge). This lets teachers personalize education, trading their sage-on-a-stage role for that of a coach. Students now work at their own pace and advance to the next topic only once they have thoroughly learned the last. “This is called mastery-based learning,” says Sinha, “and there’s research going back to the seventies that
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