Ultrasonic pest repellers, once plugged into an electrical outlet, operate by emitting short wavelength, high-frequency sound ...

Pigeons, robins, and other pest birds are often responsible for electrical outages, clogged pipes, or even structural damage ...

“Metasurfaces are engineered materials that manipulate wave behaviour in ways that natural materials cannot,” said Zhong. “In ...

That is the idea behind "audio enclaves"—a unique sound technology made by a couple of researchers from Penn State University. In a nutshell, special projectors beam self-bending ultrasonic ...