Richard Feynman was one of the brightest physicists ever. His books, although dense and precise, are nevertheless some of the most accessible. He stood on the field at Trinity and looked at the first atomic explosion without dark glasses because (he said) he knew the simple bright light couldn't hurt him. He was a tireless debunker of nonsense, a very funny man, and he blamed bongos. But the thing that made him special...he was never afraid to look and he never used tinted glasses to do it. Via pharyngula.