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President Trump’s threat on Wednesday to restart the testing of nuclear weapons has raised numerous knotty questions about national and global security. The United States spends tens of billions ... All existing nuclear weapons derive some of their explosive energy from nuclear fission reactions. Weapons whose explosive output is exclusively from fission reactions are commonly referred to as atomic bombs or atom bombs (abbreviated as A-bombs). Atomic bombings of Hiroshima and Nagasaki, during World War II, American bombing raids on the Japanese cities of Hiroshima (August 6, 1945) and Nagasaki (August 9, 1945) that marked the first use of atomic weapons in war. Tens of thousands were killed in the blasts and thousands more would die of radiation poisoning. The atomic bomb is a weapon of mass destruction based on the properties of nuclear energy. Types of pumps and operation.