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Wi-Fi signals

Stray Wi-Fi signals could let spies see inside closed rooms

By Adrian Cho Your wireless router may be giving you away in manner you never dreamed of. For the first time, physicists have used radio waves from a Wi-Fi transmitter to encode a 3D image of a real object in a hologram similar to the image of Princess Leia projected by R2D2 in the movie Star Wars. In principle, the technique could enable outsiders…
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