Bohr came “most secretly of all,” as Oppenheimer explained, to advance a political cause—the case for openness in science as well as international relations, the only hope to forestall a postwar nuclear arms race. This was a message Oppenheimer was ready to hear. For nearly two years, he had been preoccupied with complex administrative responsibilities. As the months rolled by, he was becoming less and less a theoretical physicist and more and more a science administrator. This transformation had to be intellectually stifling for him. So when Bohr showed up on the mesa speaking in deeply
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