khanLike Bill Gates and many others, we’re big fans of, which offers free lectures in math, science and history. These video lectures are being used to change the usual path of learning: instead of listening to lectures during class and doing problems at night, students watch the video lectures at night and then work on problems in the daytime, with teachers standing there to help.

A new study from public policy research firm MDRC confirms this works. Many failing first graders have caught up with the rest of the class and high school seniors have seen grades go up six percentage points.

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