Economic Collapse

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Scientists have found a way to photograph people in 3D through walls using Wi-Fi

http://www.businessinsider.com/wifi-camera-sees-through-walls-2017-5

Now, German scientists have found a way to exploit this property to take holograms, or 3D photographs, of objects inside a room — from outside it.

"It can basically scan a room with someone's Wi-Fi transmission," Philipp Holl, a 23-year-old undergraduate physics student at the Technical University of Munich, told Business Insider.

Holl initially built the device as part of his bachelor thesis with the help of his academic supervisor, Friedemann Reinhard. The two later submitted a study about their technique to the journal Physical Review Letters, which published their paper in early May.

Holl says the technology is only in its prototype stage and has limited resolution, but he is excited about its promise.

"If there's a cup of coffee on a table, you may see something is there, but you couldn't see the shape," Holl says. "But you could make out the shape of a person, or a dog on a couch. Really any object that's more than 4 centimeters in size."