Physicist Jeffrey Hazboun visits WIRED to answer the internet's swirling questions about physics. How does one split an atom? Is light a wave or a particle...or both? How soon will the universe end?

Sound has a speed limit. Under normal circumstances, its waves can travel no faster than about 36 kilometers per second, physicists propose October 9 in Science Advances. Sound zips along at different ...

Ultrasonic sound waves have been used to levitate objects in crowded rooms to make hologram-like displays. Such acoustic levitation was previously only practical in empty spaces, but a new algorithm ...