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History

A critical mass of secrets

06 Feb 2020 Margaret Harris
Taken from the February 2020 issue of Physics World.
Klaus Fuchs
Physicist, refugee, Communist, spy Klaus Fuchs (left) and senior scientists at Harwell circa 1950. (Courtesy: Photo courtesy of UKAEA and Harwell Campus)
In the spring of 1941, Rudolf Peierls was in a bind. The British effort to develop atomic weapons, i

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