Scientists use sound waves to levitate, manipulate matter (+video)

A team of researchers in Switzerland have developed a way of levitating and transporting small objects using nothing but sound.
Using ultrasonic waves – that is, sound waves whose frequency is too high for humans to hear – scientists at the Swiss Federal Institute of Technology in Zurich have made water droplets, instant coffee crystals, styrofoam flakes, and a toothpick, among other objects, hang in midair, move along a plane, and interact with each other. It is the first time that scientists have been able to use sound to simultaneously levitate several objects next to each other.

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