Ultrasonic levitation has been possible for awhile, but it's not very practical when objects must typically hover along a single axis. University of Tokyo researchers Yoichi Ochiai, Takayuki Hoshi and Jun Rekimoto have cleared this hurdle with an ...from Engadget RSS Feed http://www.engadget.com/2014/01/01/ultrasonic-array-moves-objects-in-3d/?ncid=rss_truncated
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