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**The Bomb**
//" The atom bomb was no 'great decision.' It was merely another powerful weapon in the arsenal of righteousness." // -Harry S. Truman = =

-- Atomic Bomb detonated over Nagasaki, Japan by the United States -- 2nd of only 2 Nuclear weapons used in warfare -- 3rd man-made nuclear explosion -- Used as the basis of most of the original bombs, including "Joe 1," or "First Lightning," of the Soviet Union.
 * __Fat Man__**

A neutron hits the nucleus of the Plutonium 235 atom. This causes the nucleus to split and several free neutrons to be released. This allows the chain reaction. The principle behind the first nuclear bomb was an uncontrolled fission reaction. This process is also used in a nuclear reactor. Though, in a nuclear reactor, it is not so uncontrolled. By using control rods (made of materials capable of absorbing neutrons without fissioning themselves), the reaction is limited, avoiding a disruptive explosion. However this is the war; an explosion was wanted. Hence, this nuclear reactor control process was not needed. And BAM! A bomb was created.

The math involved for this is very complicated and would be beyond the understanding of the common man. Generally, The energy given off comes from the reduction in total bond energy in the nuclei of the daughter atoms, as opposed to the Pu - 235 nucleus. The little bit of "mass" that is not conserved in the reaction (neutron + Pu --> Daughters + neutrons) is seen fully as energy, according to Einstein's renowned equation relating mass and energy.