Particle Spin and Statistics

Pauli Exclusion Principle:
       no two identical fermions in the same state,
       (same spin, color charge, angular momentum ...)
       can exist in the same place at the same time

Fermions...The Matter Particles
       electrons, nucleons...leptons and quarks
       particles with internal angular momentum,
             intrinsic spin = 1/2 integer
subject to Pauli exclusion...only 1 in each state

Bosons...The Force Particles
       photons, gluons, gravitons...
              integer intrinsic spin = 0, 1, 2
not subject to Pauli exclusion, can occupy same state