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I think both Feynman and Schrodinger best Heisenberg. Story about Feynman during his undergraduate years at MIT. He entered the Putnam Mathematics Competition, which is a famously difficult test given to undergraduates; in many years the median score is zero. The day of the test Feynamn was standing in his fraternity house's library when a brother walked in, looked at his watch, and asked, "Aren't you supposed to be taking the Putnam exam?" "I finished early." He was named a Putnam Fellow (top five, six).
I'm asking myself why I have Feynman over Heisenberg. Although I am more familiar with Feynman (he wrote several excellent books for laymen), I've just finished a bio of Heisenberg. Maybe it's all about being able to understand Heisenberg's work better than I can Feynman's. (The guy whose work you can't understand has to be smarter than the guy whose work you can understand.) Maybe it's just my being more of a fan for Feynman.
My favorite Feynman story (I found it online but have lost it, alas! Alas!): It's early in the morning at CalTech and a graduate student steps out of his lab for a drink from the fountain. It's early, no classes. The graduate student hears a familiar voice, he goes to investigate. He sees Feynman in front of an emtpy lecture hall, rehearsing the PHY 101 lecture he will be giving later that same day. I need to paraphrase: "I stood there, watching the world's greatest living physicist prepare for his PHY 101 class as if it were the most important talk he'd ever be giving." What an inspiration.