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, he started making short video versions of his tutorials. And then a funny thing happened. His cousins reported that they liked learning from his videos better than from him.

Having a video made it so they could repeat and replay anything that they didn’t understand as many times as necessary. They could refer back to weeks-old lessons without having to feel embarrassed about it. They could learn without another person standing over their shoulder asking, “do you understand yet?”

To date, Khan has posted more than 2,200 talks on everything from basic math to history. Between 100,000 and 200,000 lectures are watched every day.