The Curious Science of Counting a Crowd https://t.co/iQs0WymYf9 via @PopMech— Dr.Steven D.Sanders (@DocEngineering) January 22, 2017
The Curious Science of Counting a Crowd https://t.co/iQs0WymYf9 via @PopMech— Dr.Steven D.Sanders (@DocEngineering) January 22, 2017
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