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" ... The first time I got a real sense of this phenomenon was with my college friend Sal Khan. Sal started posting YouTube videos as a way to tutor his niece. The videos he posted were simple screencasts of him solving algebra problems—basically the opposite type of content you’d see on TV. But people loved it. One night over dinner, Sal asked me if this viewership he was seeing was real. And if it was, should he quit his stable job as a hedge fund analyst and devote himself to it full time? Sal’s wife (pregnant at the time) gave me a piercing look. I told him I couldn’t promise anything but that I was betting my career on online video. Sal quit, and Khan Academy is now one of the largest educational networks on the planet. ... "