Wi-Fi fills our world with radio waves. In your home, in the office, and increasingly on city streets, humans are bathed in a constant background field of 2.4- and 5-gigahertz radio signals.
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sing Wi-Fi to 'See' Behind Closed Doors Is Easier than Anyone Thought
By Technology Review
November 6, 2018
![[article image]](https://cacm.acm.org/system/assets/0003/3116/11618.techreview.seeing_through_walls.large.jpg?1541533076&1541533075 "Seeing through walls")
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