Some weeks ago Dr. Otto Hahn of Berlin's Kaiser Wilhelm Institute donned his work clothes, walked into his laboratory to perform a physical experiment. With a stream of neutrons (obtainable by subjecting a pinch of beryllium to the emanations of the radioactive gas radon) he bombarded a bit of uranium. While the routine little experiment proceeded all was peace and quiet in the laboratory. There was no crash of thunder, no flash of cataclysmic lightning.
But when Dr. Hahn examined his end-products and sat down with pencil and paper to figure out what had...
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