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 ...

A Portland, Oregon, building with a 7-Eleven in it put out a device that emits a high-pitched, piercing noise to deter the homeless from camping and sleeping. City officials shut it down, saying it ...

Researchers have revealed how high-frequency sound waves can be used to build new materials, make smart nanoparticles and even deliver drugs to the lungs for painless, needle-free vaccinations. While ...

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 ...