manhattanproject

World War II. It was named after the Manhattan Engineer District of the U.S. Army Corps of Engineers,

because a lot of it’s earlier research was done in New York City. An atomic bomb is a weapon that uses

the energy from a nuclear reaction called Fission for its destruction.

The idea that mass could be changed into energy was predicted by Albert Einstein in the earlier

part of the 1900’s. John D. Cockcroft and Ernest Walton confirmed this by experiments in 1932. Then in

1938, nuclear fission was discovered by German scientists, and it was feared by many of the U.S.

scientists, that Hitler would try to build a fission bomb. Three Hungarian-born physicists, Leo Szilard,

Eugene Wigner, and Edward Teller asked Albert Einstein to send a letter to Franklin Roosevelt.

Compelled by the letter in late 1939, Roosevelt ordered an effort to obtain an atomic weapon before

At first, this program was led by Vannevar Bush, head of the National Defense Research committee

and the Office of Scientific Research and Development. Then it came under control of Leslie Groves of

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