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Scientists develop acoustic levitation, could enable the eventual levitation of humans

For the first time, researchers have succeeded in levitating and moving arbitrarily shaped objects using acoustic (sound) waves. The researchers, from the Swiss Federal Institute of Technology (ETH) in Zurich, have already used their new-found magical powers of levitation to collide a granule of coffee and water to create instant coffee in midair — and more excitingly, a droplet of water and a piece of sodium (the explosively awesome video is embedded below). The same approach could potentially work on humans, though, without further refinements to the technology, we would probably explode or suffer catastrophic internal bleeding.
Acoustic levitation is desirable because, unlike magnetic levitation, it can be used on any object — not just materials and liquids that are magnetic. Likewise, buoyancy can be used to “levitate” some liquids, but again there are strict limitations on what liquids can be used (they must be immiscible, as with water and oil). The only limitation with acoustic levitation is that the object’s diameter must correspond to half the wavelength of the acoustic waves. As you can see, the team have no issues levitating a toothpick — something that would be impossible with both magnetic and buoyancy levitation.
Levitating a toothpick with acoustic levitation
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