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

the Army Corps of Engineers. Groves qui

isotopes of 235 and 238 of the same element).

Hanford, Washington, where U-238 was blasted with neutrons to make plutonium. It was then sent to Los

a policy of resistance to the end. Word of their surrender finally reached Washington on August 10th.

damaged. The bomb weighed 9,700 pounds. It detonated 1900 feet above the city, and exploded with a force

though it missed the target, it devastated the city and killed about 40,000 people, and injured 60,000

However, several other countries are believed to have some nuclear weapons, like Israel and South

bomb was produce and sent to Los Alamos, where it was made into a gun-type weapon. One small piece of

Missile Range on July 16, 1945. This bomb was used on Nagasaki, Japan, on August 9, 1945.

In general, the Hydrogen Bomb was like an atomic bomb with a Hydrogen fuel. The fuel would fusion

is the U-238 isotope, and only .7% is the lighter, more "fissionable" isotope U-235. Next, he gathered

Charles Sweeney) on Nagasaki, Japan on August 9, 1945, at 11:01 a.m. The original target was Kokura

When the "uranium based" atomic bomb, (nick-named Little Boy), was dropped (by the Enola Gay ,

flown by Colonel Paul Tibbets), on Hiroshima, Japan, on August 6, 1945, at 8:15 a.m., five square miles

very dense supercritical mass, that in chain reaction lasted long enough for a large and destructive

Some common words found in the essay are:
Japan August, Los Alamos, Nagasaki Fat, Hydrogen Bomb, Nagasaki Japan, Ernest Walton, Alamos Mexico, Uranium-238 Uranium-235, Casualty Commission, Washington August, atomic bomb, chain reaction, japan august, nagasaki japan, los alamos, japan august 9, sent los, bomb hydrogen, 1945 bomb, oak ridge, 6 1945, army corps engineers, hiroshima japan august, nagasaki japan august, sent los alamos,
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Approximate Pages = 6 (250 words per page double spaced)