No one has ever probed a particle more stringently than this. In a new experiment, scientists measured a magnetic property of the electron more carefully than ever before, making the most precise ...

Light has always been the stage on which quantum mechanics performs its strangest tricks, and the double-slit experiment is ...

Physicists have spent decades treating mass as something the universe simply hands to particles, a property encoded in ...

Physicists have found that an elementary particle called the W boson appears to be 0.1 percent too heavy—a tiny discrepancy that could foreshadow a huge shift in fundamental physics. The measurement, ...