Physicists have finally turned a long standing thought experiment into a laboratory reality, showing that electromagnetic waves can be reflected in time as cleanly as light bounces off a mirror in ...

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 ...

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 ...