An everyday LCD screen has been modified to "see" the world in front of it in 3D.
That means a viewer can control on-screen objects by waving their arms in the air without touching the screen, let alone a mouse or keyboard.
Source:http://www.newscientist.com/article/dn18286-lcd-screen-can-recognise-what-happens-in-front-of-it.html?DCMP=OTC-rss&nsref=online-news
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