The finding comes from an experiment at Fermilab called Muon g-2, which looks at particles called muons that are heavier cousins of electrons. “Well, since the discovery of the muon, it’s played, actually, a rather unique and versatile role in subatomic physics. “But you might ask, ‘What do we care about that for?’ Well, the laws of physics actually predict this magnetism very, very precisely. “And every 29 times around the track, the spin direction actually makes an extra full turn. And only then, when we analyze all of it, might we actually know, you know, the final truth to this.