Khan compared it to learning how to ride a bicycle. Then he got a letter from the parent of a 12-year-old autistic boy who had experienced a lot of difficulty grasping math.Įven the ones who get 95 percent of the lesson correct, still have 5 percent they didn't grasp, and with each subsequent lesson, the percentage they don't understand increases. Since I remembered seeing all this matrix text in class, and here I’m all like, ‘I know kung-fu.’”

'I actually got a natural high and a good mood for the entire day. “First time I smiled doing a derivative,” one commenter wrote on YouTube about a calculus video Khan had posted. He began receiving comments and letters from random viewers around the world, expressing appreciation for his lessons. Khan’s videos caught on among other family members and soon strangers were stumbling upon them online as well. They can watch it at their own time at their own pace.” “If they have to review something that they should have learned a couple of weeks ago or maybe a couple of years ago, they don’t have to be embarrassed and ask their cousin,” Khan said. What this meant, essentially, was that having a video lesson that they could pause and repeat at will, made it easier to learn without tiring their tutor.

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