I enjoy reading about cosmology and physics, and in particular books by and about Richard P Feynman (1918 - 1988). Mention the name Albert Einstein to the man on the street and it's almost certain he'll know exactly who you mean. Mention the name Richard Feynman, however, and the result is much less certain, although in fact he was without doubt one of the greatest scientific minds the twentieth century has seen. The mathematician Marc Kac, who was born in Poland but who spent most of his career in The United States, explains it thus - "An ordinary genius is a fellow that you and I would be just as good as if we were only many times more clever. There is no mystery as to how his mind works, and once what he has done has been explained to us we feel certain that we, too, could have done it, if only we had been bright enough. It is different with the magicians, the workings of whose minds are to all intents and purposes totally incomprehensible. Even after we understand what they have done, the process by which they have done it is completely dark. Richard Feynman is a magician of the highest calibre."