Little Boy
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Little Boy was one of the two designs for the atomic bomb developed at Los Alamos. The other design was called Fat man.
Little boy consisted of two masses of Uranium 235 as radioactive material. A "gun-assembly method" ignited the bomb as follows: one subcritical mass of uranium was fired at another, and together they reached a critical mass to set off a nuclear explosion.
Little boy was dropped on Hiroshima. Fat Man was dropped on Nagasaki.