Physicists have found a way to measure how long ultra-fast quantum events actually take—without using a clock at all.

In a supercooled lab setting, a tiny crystal has quietly flipped a half-century-old assumption on its head. Scientists at Rice University have reported the first direct observation of a long-predicted ...

The original version of this story appeared in Quanta Magazine. Imagine standing on a railway platform watching a trolley go past. A girl on the trolley drops a bright red ball. To her, the ball falls ...