The gauge symetry method for describing force and particles
lead theorists (1970's) on a search to describe everything in terms of one
great symmetry.
The only astmmetry left was between particles (fermions) and
forces (bosons).
The theory that unifies these is called Supersymmetry or SUSY
basicaly says for
every fermion there is a bosonic supersymetric partener
SUSY reestablishes space-time/special relativity to the quantum level.
Very powerful theory GUT s ex.
N=8 supergravity
Broken symmetry?
Dark Matter?