J. Robert Oppenheimer made his greatest contribution to physics in 1939. It was three years before he met Gen. Leslie Groves, three years before they built a town in the New Mexico desert, and three years before they recruited thousands of scientists and their families to live in that desert town where they worked toward a single-minded goal: a weapon of such destructive power that it would end World War II, perhaps even all wars. Hitler had just invaded Poland, and Oppenheimer, a professor at the University of California, Berkeley, was working on a paper that used Einstein’s theory of relativity to identify what we now call black holes.
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