Powerful,carefully controlled sound waves could be used to control objects without having to touch them at all—even inside the human body.
This video shows a real live tractor beam in action. It uses an array of small speakers to levitate objects and to creep them precisely through the air. The beam can even pull objects from above, just like the tractor beams that aliens spacecraft use to abduct human subjects for their terrifying experiments.
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Source: fastcompany.com