Just saw this video demo of the Defence Advanced Research Projects Agency's (DARPA) Instant Fire Suppression program.
Pretty crazy right?
So what's the weirdest use of sound you've come across?
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The use of ultrasonic frequencies to generate localized, audible, sound: http://www.ncbi.nlm.nih.gov/pubmed/19574137
Using inaudible sound waves to recreate audible sound somewhere else? It's basically holographic sound. I talked to a guy at AES in 2011 who works on that kind of thing over in Europe, and it completely blew my brain apart. The technology ain't young by any stretch. It's part of how Audio Spotlight works.
Maybe Ultrasonic levitation : http://www.youtube.com/watch?v=S4exO4CuoSU
Cymatic Studies http://www.youtube.com/watch?v=sY6z2hLgYuY