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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.  

Little boy was dropped on [[Hiroshima]] [[Japan]] on August 9th, 1945. It is estimated that the bomb killed 140,000 people.  

Little boy was dropped on [[Hiroshima]] [[Japan]] on August 6th, 1945. It is estimated that the bomb killed 140,000 people.  

==See Also==

==See Also==