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29/09/1901 Italian-American physicist Enrico Fermi is born

Fermi is famous as the builder of the first nuclear reactor. He also developed the theory of the of beta decay. According to it, the neutron can change into a proton, electron and unknown very light neutral particle, first postulated by Wolfgang Pauli. Fermi suggested calling this light particle neutrino. One type of elementary particles is called the fermions in his honor.