When you see light, you’re looking at photons spat out by an excited atom. But what if instead of light, an excited atom released a wave of matter?
Ever since the late 17th century, it’s been understood that to every action there is an equal and opposite reaction. That’s Newton’s Third Law of Motion. But a group of German scientists recently came up with a trick that appears to break that law, one that lets light accelerate all by itself. And it could…