Our hearing picks up a limited range of sounds, limits that were used successfully to keep teenagers from congregating outside British grocery stores by a device called the “teenage sound repeller." ...

Sound speeds are able to tell researchers an impressive amount of information about a planet's surface, especially on Mars, which evidently has two separate speeds for low-pitched sound frequencies ...

On Mars, the speed of sound depends on its pitch. All sound travels slower through Mars’ air compared with Earth’s. But the higher-pitched clacks of a laser zapping rocks travels slightly faster in ...