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Re:How Khan Academy Is Changing the Rules of Education by kenjackson on Saturday July 16, 2011 @11:27AM (#2770939)
Professional mathematicians peak in their 20s, just after they stop solving "shallow" questions, and start poring over "deep" ones.

Citation? Wiles proved FLT at age 40. Perelman proved Poincare at age 39. Richard Hamilton was 50 at the time.

But even with that great mathematicians START doing deep problems early in life. By the time their 25 they've been doing deep problems for a decade at least. Terrence Tao, for example, was doing calculus at age 7. He got a gold at IMO at age 13. These great mathematicians like Tao, Goedel, Neuman have long gone beyond grill and drill math before age 20. So the notion that they just recently stopped solving shallow questions is absurd.

Re:How Khan Academy Is Changing the Rules of Education by wisty on Saturday July 16, 2011 @04:44PM (#2771750)
Lehman's Age and Achievement is the source of that meme. It may be downright wrong, though.