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Manhattan Project

The Manhattan Project refers to the effort to develop the first nuclear weapons during World War II by the United States with assistance from the United Kingdom and Canada.

Formally designated as the Manhattan Engineering District (MED), it refers specifically to the period of the project from 1942-1946.

The project succeeded in developing and detonating three nuclear weapons in 1945: a test detonation on July 16 (the Trinity test) near Alamogordo, New Mexico; an enriched uranium bomb code-named "Little Boy" detonated on August 6 over Hiroshima, Japan; and a plutonium bomb code-named "Fat Man" on August 9 over Nagasaki, Japan.

Note:   The above text is excerpted from the Wikipedia article "Manhattan Project", which has been released under the GNU Free Documentation License.
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