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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.
The first atomic bomb, "Little Boy," weighed about 9,700 pounds (4,400 kg).
The weight of the atomic bomb dropped on Hiroshima was approximately 9,700 pounds (4,400 kilograms).
The "Little Boy" atomic bomb dropped on Hiroshima weighed approximately 9,700 pounds. The "Fat Man" bomb dropped on Nagasaki weighed around 10,300 pounds.
Albert Einstein did not invent the atomic bomb. The atomic bomb was developed during World War II as part of the Manhattan Project, and the two bombs dropped on Hiroshima and Nagasaki were called "Little Boy" and "Fat Man" respectively.
The first atomic bombs were nicknamed "Little Boy" and "Fat Man." "Little Boy" was dropped on Hiroshima, Japan on August 6, 1945, and "Fat Man" was dropped on Nagasaki, Japan on August 9, 1945, towards the end of World War II.