Lite mer ljudvågs-"magi":

Inte bara i sci-fi…"Tractor beam"!

"The technique, published in Nature Communicationstoday (27 October 2015), could be developed for a wide range OF applications. For example, a sonic production line could transport delicate objects and assemble them, all without physical contact. Or a miniature version could grip and transport drug capsules or microsurgical instruments through living tissue."

http://myscienceacademy.org/2015/10/27/from-science-fiction-to-reality-sonic-tractor-beam-invented/