Harold Clayton Urey(1893-1981)
An American chemist and pioneer in the study of solar system. He isolated heavy water and discovered Deuterium, a heavy isotope of hydrogen. During the second world war he worked in the production and use of atomic bomb. He suggested that the moon had a separate origin from that of the earth. He along with his associates formulated the basic theory for the separation of the fissionable isotope Uranium 235 from the much more common Uranium 238.
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