tractor beams
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Watch A Sonic Tractor Beam Levitate A Helpless Ball
The tractor beam, a beloved staple of science fiction, has been inching closer and closer to reality. We’ve got physicists building optical beams that can pull micro-scale balls through water. NASA and Arx Pax (of “hoverboard” fame) are building a magnetic tractor beam that can control satellites. The latest incarnation of this Star Trek-inspired technology?…