Subatomic particles wobble because of invisible quantum foam

The muon is a heavy, unstable cousin of the electron that acts like a tiny internal compass. When placed in a magnetic field, it should wobble at a very specific rate, but for decades, physicists at Fermilab and Brookhaven have watched it spin slightly faster than the laws of physics suggest. This discrepancy occurs because the muon is constantly being buffeted by 'quantum foam'—a frantic sea of virtual particles that pop into existence for a trillionth of a second before vanishing back into the vacuum.