A tractor beam reels in objects with sound

Ultrasound machine pulls on a target that is large enough to see

BEAM ME IN  At left, waves (yellow dashed lines) from a regular beam of light or sound tend to bounce off an object (blue arrows) and deliver a subtle push. Waves from a new tractor beam, illustrated at right, bounce off the sides of an object and rebound upward. As a result, the object gets pulled toward the source of the beam.

 

M. Atarod

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