I love what this guy is doing: Salman Khan has recorded over a thousand ten-minute lectures on every topic in the K-12 curriculum (and quite a bit beyond that), and they are all free. There are tons of math lectures. He is doing it primarily as labor of love, not for profit. I hope he gets very rich off it anyway; he deserves it. Amazing and inspiring to see. Check out the Khan Academy.
Via: BoingBoingth
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