Historians root out fourth atomic spy in the Manhattan Project
The world's first atomic bomb was detonated on July 16, 1945, in the New Mexican desert -- a result of a highly secretive effort code-named the Manhattan Project, whose nerve center lay nearby in Los Alamos. Just 49 months later, the Soviets detonated a nearly identical device in Central Asia, and Washington's monopoly on nuclear arms abruptly ended.
William J. Broad, New York Times