The first private research atomic reactor opened in Chicago, Illinois, US.
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The world's first self-sustaining nuclear chain reaction happened in Chicago Pile-1 at the University of Chicago. It was overseen by Enrico Fermi.
Nine thousand scientists from 43 nations signed a petition to ban nuclear testing.
The US tested the TX-17 thermonuclear bomb for the first time in Bikini Atoll of the Marshall Islands.
France became the fourth nuclear-capable nation following its successful Gerboise Bleue atomic test.
A nuclear bomb was lost off the coast of Georgia, US.
