From ReutersGraphics: It took just a few years to develop the first atomic weapon. Seventy-five years after the U.S. dropped the bomb on Hiroshima, humanity is still coming to grips with the results
The work to turn nuclear fission, a process German scientists discovered in the late 1930s, into a weapon was dubbed the Manhattan Project in the United States. Led by the U.S. Army, it involved at its peak more than 100,000 personnel, ranging from scientists to construction workers, according to the U.S. Department of Energy. Scientists first built a working nuclear reactor. The site: beneath the bleachers of the University of Chicago football stadium.
It began the race to enrich enough of the isotope of uranium needed – uranium 235, whose structure makes a chain reaction possible – and plutonium, another fissionable element isolated by a team at the University of California in 1940. Scientists, meanwhile, struggled on how to best create the instantaneous critical mass needed for an explosion.
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