Assertion: nuclear explosion | /r/HasProperty | nuclear detonation
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text: A nuclear explosion (nuclear detonation) has occurred on Earth twice using a nuclear weapon during war (during World War II, the atomic bombings of Hiroshima and Nagasaki), about 2,000 times during testing of nuclear weapons, and about 27 times in the U.S. and 156 in the U.S.S.R. in a series of peaceful nuclear explosions; see Operation Plowshare; and Nuclear Explosions for the National Economy