Are all of the forces we know just parts of a single, unified force? How is the Higgs boson so light? What is dark matter? Is the world made up of the tiny, vibrating strings described by string theory?

Does every fundamental particle we know about have a hidden partner - a superparticle - that we have yet to meet? A popular hypothesis known as Supersymmetry predicts that they do but the first run of the LHC came and went without any of these partner particles turning up.

Fortunately for theoretical physicists  there are millions of possible models consistent with natural Supersymmetry and physicists will never build enough particle accelerators to eliminate them all. 

Natural SUSY’s last stand by Mike Ross, Symmetry