Hans A. Bethe

When Hans Bethe, at the age of 97, asked his long-term collaborator, Gerry Brown, to explain his scientific work to the world, the latter knew that this was a steep task.

Few would argue that Richard Feynman was one of the greatest American-born theoretical physicists of the twentieth century, and fewer still would dispute that he was the most iconoclastic. In the words of the eminent mathematician Mark Kac, geniuses are of two kinds: the ordinary, and the magicians. Feynman was a magician of the highest caliber. No one could guess how his mind worked, how he could make transcendental leaps of the imagination so fearlessly. A true original, Feynman was both an inspired, Nobel-prize winning pioneer, and a born showman. He never lost sight of his vision of science as "a long history of learning how not to fool ourselves."