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It isn't exactly Superman-like X-ray vision, but cheap, low-power Wi-Fi technology is gaining more attention as a remote sensing tool.
Prototype stealth device can detect movement behind a thick brick wall. U.K. military is looking into whether it can be used in "urban warfare" for scanning buildings.
Cambridge Consultants unveils a new backpack form factor for radars that can see through walls.
It's not the most powerful but weighs only 11 pounds