Hand clapping is ubiquitous behavior for humans across time and cultures, serving many different purposes: to signify approval with applause, for instance, or to keep time to music. Acousticians often ...

In a pivotal scene from the 2006 film X-Men: The Last Stand, a mutant claps his hands and blasts a shockwave across a battlefield. In a theater somewhere, Sunny Jung watched—and wondered. “It made me ...