Sound exerts a small acoustic force and by turning up the volume of ultrasonic waves, too high pitched for humans to hear, scientists create a sound field strong enough to move small objects.
from Hindustan Times - lifestyle https://www.hindustantimes.com/health/scientists-sew-with-just-sound-waves/story-YwdJAbE3GR7AxVKsANG3ZL.html>
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