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150-megaton thermonuclear explosion, Bikini Atoll, 1 March 1954.The unexpected spread of fallout from the test led to awareness of, and research into, radioactive pollution. Courtesy UNO. (Photo by Ann Ronan Pictures/Print Collector/Getty Images)

150-megaton thermonuclear explosion, Bikini Atoll, 1 March 1954.The unexpected spread of fallout from the test led to awareness of, and research into, radioactive pollution. Courtesy UNO. (Photo by Ann Ronan Pictures/Print Collector/Getty Images)