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The difference was little boy was droped on Hiroshima in world war 2, it is much smaller than the fat man used on Nagasaki and the little boy uses uranium to compress it. The fat man uses plutonium to detonate.

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15y ago

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"Fat Man" and "Little Boy" were the codenames given to the two atomic bombs dropped on Japan during World War II. "Fat Man" was named after Winston Churchill, while "Little Boy" was named after President Franklin D. Roosevelt. The names were chosen to maintain secrecy and prevent potential eavesdropping on communications about the bombs.

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10mo ago
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Q: Why is the atomic bomb called Fat Man and Little Boy?
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