Acoustic Levitation Is Real

Excerpt:

Scientists have developed a sound generator so powerful its shock waves can stun, and even kill people.

Another group of researchers have developed another unusual application for sound: a method of "acoustic levitation" that could help maintain colonies on Mars or the moon by using high-pitched sound waves to remove alien dust.

http://www.huffingtonpost.com/2010/01/20/acoustic-levitation-stere_n_429558.html