life: Radioactive cloud from nuclear test, Bikini Atoll, July 1946. See more photos on LIFE.com here. (Fritz Goro

life: Radioactive cloud from nuclear test, Bikini Atoll, July 1946. See more photos

life: Radioactive cloud from nuclear test, Bikini Atoll, July 1946. See more photos on LIFE.com here. (Fritz Goro—Time & Life Pictures/Getty Images)

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