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  • April 4, 1949 - The North Atlantic Treaty establishes NATO, a military alliance aimed at protecting Western nations from the Soviet bloc.
  • April 10, 1945 - As part of the Manhattan Project, an injured motorcyclist named Ebb Cade was injected with 4.7 micrograms of plutonium without his knowledge.
  • April 11, 1963 - The Vatican releases the Encyclical Letter Pacem in Terris, by Pope John XXIII, which calls for an end to the nuclear arms race.
  • April 26, 1986 - An uncontrolled surge of power, followed by fire and an explosion, at reactor No. 4 of the Chernobyl Nuclear Power Plant, sends a radioactive cloud around the world and contaminates large areas in the Ukraine and Byelorussia. About 50 million curies of radiation are released.
 
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