Full Idea
Supersymmetry posits heavy boson partners for all fermions, and heavy fermions for all bosons.
Gist of Idea
Supersymmetry has extra heavy bosons and heavy fermions
Source
New Scientist writers (Why the Universe Exists [2017], 02)
A Reaction
The main Fermions are electron, proton and quark. Do extra bosons imply extra forces? Peter Higgs favours supersymmetry.
Book Reference
New Scientist writers: 'Why the Universe Exists' [John Murray 2017], p.39