
On April 7, news outlets reported mounting evidence that tiny subatomic particles called muons seem to be disobeying the known laws of physics. Muons are akin to electrons but heavier and radioactive and, well, wobbly. When shot through a magnetic field at the Fermi National Accelerator Laboratory (Fermilab) in Batavia, Illinois, the muons did not behave as had been predicted. The muon’s aberrant...