" Quantum sync also explains how superconductivity works. The argument is tricky, because the herd behavior that we’ve been discussing doesn’t come easily to electrons. Being fermions, they are not naturally sociable. Instead, superconductivity relies on a subtle mechanism that prods the electrons to join in pairs, at which point they become bosons and lose all inhibition. These paired electrons spontaneously form a Bose-Einstein condensate, a synchronized ensemble that encounters no resistance as it carries electrical current through a metal. "

― Steven H. Strogatz , Sync: The Emerging Science of Spontaneous Order