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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''' was one of the two original American designs for the [[atomic bomb]] developed at Los Alamos during [[World War II]]. 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 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.