Natura - nature
Count: 14k;234p;892c;1650o;9995f;116,669g;257,943s;29,212ss;2073v;35,692;112e; ‡2o;20f;119g;518s;110ss;1v;7; †6p;92c;638o;3910f;18,946g;6869s;207ss;2v;496;14e
   actualia - actual entities
  Count: 14k;234p;892c;1650o;9995f;116,669g;257,938s;29,212ss;2073v;35,692;112e; ‡2o;20f;119g;518s;110ss;1v;7; †6p;92c;638o;3910f;18,946g;6869s;207ss;2v;496;14e
     Mundus Plinius - physical world
    Count: 14k;234p;892c;1650o;9995f;116,669g;257,938s;29,212ss;2073v;35,690;112e; ‡2o;20f;119g;518s;110ss;1v;7; †6p;92c;638o;3910f;18,946g;6869s;207ss;2v;496;14e
       particles
      Count: 398s
         elementary particles
        Count: [*] 29s
           elementary fermions - elementary particles with half-integer spin
          Count: [*] 24s
             leptons
            Count: [*] 6s
               1.1 electron 1897
              Count: -
               1.2 electron neutrino C.L. Cowan et al., 1956
              Count: -
               2.1 muon 1930's
              Count: -
               2.2 muon neutrino 1962
              Count: -
               3.1 tau M.L. Perl et al., 1975
              Count: -
               3.2 tau neutrino
              Count: -