The atomic bombs dropped on Hiroshima and Nagasaki at the end of World War II—codenamed "Little Boy" and "Fat Man," respectively—caused widespread destruction, leveled cities, and killed between 90,000 and 166,000 people in Hiroshima (about 20,000 of which were soldiers), and between 39,000 and 80,000 in Nagasaki. These are the only two nuclear weapons ever used in warfare, and let's hope it stays that way, because some of the nuclear weapons today are more than 3,000 times as powerful as the bomb dropped on Hiroshima. The Little Boy and the Fat Man were atomic bombs, or fission bombs, which set off a chain reaction of nuclear fission. The atomic nuclei of radioactive materials were split to ...
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