NPR's Morning Edition
From YouTube Pioneer Sal Khan, A School With Real Classrooms
By Eric Westervelt
After some 10,000 online tutorials in 10 years, Sal Khan still starts most days at his office desk in Silicon Valley, recording himself solving math problems for his Khan Academy YouTube channel.
"OK, let F of X equal A times X to the N plus," he says cheerfully as he begins his latest. ...
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