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It sees you when you're sleeping, it knows when you're awake: WiFi can "see" you through walls
Walls come tumbling down: WiFi can detect human bodies regardless of walls (image by gunes t via flickr.com) The technology detects human bodies and their movements (image via fastcompany)

The technology detects human bodies and their movements (image via fastcompany)
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The technology detects human bodies and their movements (image via fastcompany)