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A comment on Khan of Khan Academy at TED (video). Parent comment

Re:Khan of Khan Academy at TED (video) by bradleyt on Thursday March 10, 2011 @10:20AM (#2309368)
What's nice is that if the Khan academy system were implemented universally, you would have known right away that you lacked the mathematical background you needed.
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Re:Khan of Khan Academy at TED (video) by pjscott on Thursday March 10, 2011 @03:14PM (#2310562)
Dependency graphs are really nice things to know explicitly.
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