Town (pop., 2000: 11,909), north-central New Mexico, U.S. It lies on the Pajarito plateau of the Jemez Mountains, northwest of Santa Fe. The site was chosen by the U.S. government in 1942 as the location for the Manhattan Project, which developed the first atomic bomb. After World War II, the Los Alamos Scientific Laboratory developed the first nuclear fusion bomb. The town was built to house laboratory employees; it is still the site of a major nuclear research facility.
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