since hearing about the cubic foot of uranium at Columbia, he had been keeping a close eye on experiments in atomic power, and he wrote to Cartmill: There might be a story in this thought. . . . U-235 has—I’m stating fact, not theory—been separated in quantity easily sufficient for preliminary atomic power research, and the like. They got it out of regular uranium ores by new atomic isotope separation methods; they have quantities measured in pounds. They have not brought the whole amount together, or any major portion of it. . . . They’re afraid that that explosion of energy would be so
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