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Not sure which Feynman biography you are alluding to, but if you're talking of his anecdotes - "Surely you're joking, Mr. Feynman", I don't think those are really honest bio. They dont talk about the incredibly hard work that Feynman did in order to become a genius. He worked incredibly hard, for incredibly long. His anecdotes cultivated a profile of a joker and a genius. He was probably both, but he got to the genius part by working extremely hard.