For more than half a century, the idea that light or radio waves could suddenly reverse in time sounded like a thought experiment, not a laboratory result. Now, a series of meticulous experiments has ...

In everyday life, reflections feel simple. Light bounces off a bathroom mirror so you see your face, and sound bounces off walls so you hear an echo in a gym. Physicists call that kind of bounce a ...

Physicists have finally confirmed a phenomenon that sounds like pure science fiction: waves that appear to bounce off a sudden change in time rather than a surface in space. The effect, known as a ...