[Sci-Am] A Blank Wall Can Show How Many People Are in a Room and What They're Doing

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[Sci-Am] A Blank Wall Can Show How Many People Are in a Room and What They're Doing

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2021-10-11, 17:56

A Blank Wall Can Show How Many People Are in a Room and What They're Doing

The technique is the latest method to glean a surprising amount of surveillance from a meager source

-- Read more on ScientificAmerican.com

https://www.scientificamerican.com/artic...yre-doing/

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