Feynman's The Pleasure of Finding Things Out - a collection of Richard Feynman's best essays and talks. Very good, though a little repetitive on the "what is science" front. He talks about his time working on the first atomic bomb - evading censorship of his mail, cracking safes and disrespecting authority. The story of how the folks at Oak Ridge came to believe that he was a genius is priceless. Worth a read.
Feynman, for those of you unfamiliar with him, was one of the finest theoretical physicists of the 20th century. He was still working on his PhD when he was asked to help with developing the bomb. He stopped work on his thesis to do just that. His PhD thesis was a revolutionary combination of relativity and quantum mechanics which allowed accurate calculations on quantum electro-dynamics be made, allowing experimental verification of a theory that was at that time considered enormously mathematically difficuly. That won him the Nobel Prize. Most importantly, he could play the bongos with ten beats of his right hand to eleven of his left, and could really tell a story.
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