#boson  any particle that obeys Bose-Einstein statistics but not the Pauli exclusion principle; all nuclei with an even mass number are bosons
  supertype:  particle  a body having finite mass and internal structure but negligible dimensions
  subtype:  gauge_boson__gaugeboson  a particle that mediates the interaction of two elementary particles
     subtype:  gluon  a gauge boson that mediates strong interaction among quarks
     subtype:  gravitons__graviton  a gauge boson that mediates the (extremely weak) gravitational interactions between particles
     subtype:  intermediate_vector_bosons  a gauge boson that mediates weak interactions between particles
     subtype:  photon  a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle
  subtype:  meson__mesotron  an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0
     subtype:  b-meson__bmeson  exceedingly short-lived meson
     subtype:  J_particle__psi_particle__psiparticle  a neutral meson with a large mass
     subtype:  kaon__kappa-meson__kappameson__k-meson__kmeson__K_particle  an unstable meson produced as the result of a high-energy particle collision
     subtype:  pion__pi-meson  a meson produced as the result of high-energy particle collision

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