“ [My study of the universe] leaves little doubt that life has occurred on other planets. I doubt if the human race is the most intelligent form of life. Harold Urey
“ I looked for it [heavy hydrogen, deuterium] because I thought it should exist. I didn't know it would have industrial applications or be the basic for the most powerful weapon ever known [the nuclear… Harold Urey
“ Life is not a miracle. It is a natural phenomenon, and can be expected to appear whenever there is a planet whose conditions duplicate those of the Harold Urey
