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2009-01-30 19:22:05 - revision [ Version = 1 --> Version 2 ] by vip6 Changes for correction #49 ('Unclassified entries cause problems with the search engine.'). accepted \begin{defintion} {\em Fermions} are particles with a half-integer spin value, and they are named after the famous Italian--American, Nobel Laureate physicist Enrico Fermi who built the first known operational nuclear reactor in Chicago as part of the Manhattan project during WWII. Several particles like leptons, quarks and baryons are all fermions. \end{defintion}