"The reaction is self-sustaining, the curve is exponential" were the words that announced that the first nuclear chain reaction had been created in the nuclear primary reactor.
This happened 70 years ago in Chicago, on December 2, when the previous thing had been a squash court. A group of analysts works in the absolute secrecy, in the middle of the Second World War. Even their women did not know they were working. The main thinking head was an Italian in exile and winner of a Nobel prize, Enrico Fermi.
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