Materials scientists can learn a lot about a sample material by shooting lasers at it. With nonlinear optical microscopy—a ...

Why is the universe expanding at an ever-increasing rate? This is one of the most exciting yet unresolved questions in modern ...

In 1992, three physicists began an argument about how many numbers we need to fully describe the universe. Their surprisingly ...

The weak nuclear force doesn't play by the normal rules — and, in fact, it breaks one of the biggest rules of all.

Decades ago, a renegade physicist suggested that gravity isn't so much a force as just a byproduct of the universe's tendency to get more disordered. Now this idea might finally be testable ...