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James Chadwick proves the existence of neutrons. He finds that not being repelled by similar particles, the neutrons was perfect for bombarding other neuclear substances.
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A hungarian physicist by the name of Leo Szilard figures out that if they could find an element that is split by neutrons and emmits two neutrons when it absorbs it then it would create a nuclear chain reaction.
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Leo Szilard files a patent application for the atomic bomb.
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Otto Hahn, Fritz Strassman and Lise Meitner produce Uranium Nuclear Fission at the Khaiser institute in Germany.
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President Roosevelt authorises $2 Billion to be put into the making of the atomic bomb the day before the bombing of pearl harbour.
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The US military begin remodelling the B-29 Bomber for the delivery of the Atomic Bomb.
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The bomb is tested Alamorgordo, New Mexico, exploding with the force of 18,000 tons of TNT.