Neutron : James Chadwick, England, 1932.
Nuclear Fission : Otto Hahn, Fritz Strassmann, Germany, 1938.
Nuclear Reactor : Enrico Fermi, Italy, et al., 1942.
Nylon : Wallace H. Carothers, U.S.A., 1937.
Ozone : Christian Schonbein, Germany, 1839.
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