Instructions on how to build a nuclear reactor have been revealed from five sealed envelopes that have lain hidden for almost 70 years. The documents were sent to the UK's Royal Society for safekeeping by James Chadwick, discoverer of the neutron, during World War II. He felt their contents, which described cutting-edge science, were far too sensitive to publish at the time. The documents detail experiments on nuclear fission, covering the components needed to make a nuclear reactor, how to create plutonium from uranium, and methods to stabilise nuclear chain reactions. More...
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