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• n  a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy

• fission

News & Articles

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• This Historic Exchange Kicked Off America's Entrance Into The Nuclear Arms Race
  Hungarian physicist Leó Szilárd knew he had to warn the Belgians. It was 1939, the year after the discovery of nuclear fission.
  Nov. 25, 2013 - Business Insider