Development of Nuclear Fission:
    Nuclear fission is the splitting of atoms to release a lot of energy. According to Einstein's equation, E=mc² (energy equals the mass times the speed of light squared).   This means that if the energy could be released from an ounce of uranium 235 at one time, the amount of energy released would be equivalent to millions of tons of TNT.   Fission of uranium was first discovered by two Germans.  Once the U.S. started the Manhattan Project, famous scientists such as Albert Einstein, Enrico Fermi, and Niels Bohr.  If you want to learn about how nuclear fission works, go to Nuclear Physics.    

First Atomic Bomb & World War II:
    The story of the Manhattan Project begins in June of 1942, during World War II.  According to intelligence, the Germans were building their own atomic bomb.   Fear of German aggression was the stimuli for the development of the atomic bomb in America.  Though, named the Manhattan Project, the project actually took place in three large facilities.  One in Tennessee for extraction of uranium 235, one in Washington as a home of nuclear reactors which created a new fissionable element known as plutonium, and one in New Mexico where the world's best minds worked on theory and development of the bomb.  Once Trinity (code name for the test) became a success, U.S. had control of the most powerful weapon devised by mankind.  Then came the decision of the U.S. government of whether or not to use the bomb and risk the consequence of nuclear war.

Cold War:
    The end of World War 2, started this long and bitter war. During the last years of   W.W.II, Russia (USSR) started invading eastern European countries and the United States thought that they were going to invade Japan, also. That is how the atomic bomb came into play. The U.S.A. dropped the bomb, to show the Russians and the world, that they had a super weapon. After seeing the devastating power of the bomb. U.S.A. tried to set in motion a international nuclear control movement. In March, 1946, the United States, attempted to propose an authority to do such so. In theory, IADA was going to control and inspect all countries and their development of the nuclear weaponry. The Russians saw this as a scheme of the U.S.A.. The scheme would allow them to rule the world. Russians thought the IADA would spy on their superior production methods. And it continued, and continued... until a war, without physical fighting had begun.

Present Technology:
    Today, we hold knowledge to many different kinds of atomic bombs.  We have also developed the more powerful fusion bombs like the Hydrogen bomb.  Fusion bombs, usually are referred to as fission-fusion bombs because nuclear fission is required to set off the fusion.  Another new technology we have is the neutron bomb.  This bomb is different form all the other weapons in the way that it only harms biological life. Only the building in close proximity of ground zero are harmed.