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[Sci-Am] A Blank Wall Can Show How Many People Are in a Room and What They're Doing - Scientific American - 2021-10-11
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/article/a-blank-wall-can-show-how-many-people-are-in-a-room-and-what-theyre-doing/