unlocking huge amounts of energy. Luckily for us, a tiny surplus of matter (perhaps one particle in a billion) survived the carnage. The leftover particles of matter got locked into place because temperatures were soon too low to turn them back into pure energy. And that leftover stuff is what our universe is made of. As temperatures fell, matter diversified. Electrons and neutrinos were ruled by electromagnetism and the weak nuclear force. The protons and neutrons that form
