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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 17, 2001 - The Norwegian Radiation Protection Authority (NRPA) reveals that radioactive waste from a nuclear research plant in Norway has been wrongly fed into a town’s sewage system for nine years. As a result, some of the radioactive waste has ended up as farm fertilizer.
  • 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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