Introduction Have you ever tried making “walkie-talkies” using a long piece of string and two tin cans? If you have, you know that they work surprisingly well—at longer distances you can hear people ...

High school science teacher Sam Terfa wanted to demonstrate a fundamental physics principle: resonant frequency. To do so, he found the best singer at Minnehaha Academy and had him serenade a wine ...

Acoustic levitation conjures images of Star Trek­-style tractor beams and ultrasonic hover boards, but in reality floating objects on a cushion of sound occurs on far smaller scales. That’s in part ...