This story seems to be everywhere. from the Costco magazine to Sixty Minutes.
Lots of lessons worth learning from the Khan Academy. Not just the math, but the idea that teaching can be transformative if you strip away the technique, and get down to the passion of communicating. Communicating to people who are no longer ‘audience’ but active participants.
As Sal Khan says, the format is so simple.
For more background:
Watch Sal Khan in 2011, in a Ted Talks
Watch Sanjay Gupta try his hand at a Khan Academy lecture