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(Image credit: University of Bristol via YouTube)   As strange as it may sound (literally), we could one day float in midair with the help of sound waves. A little technique known as sonic levitation. Engineers from the University of Bristol have created a new acoustic trap that produces two vortex-shaped sound waves to trap (levitate) objects more massive than the wavelengths themselves.   According to the engineers, “This discovery opens the door to the manipulation of drug c ...

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