Whatsuptoday Worldnews
Saturday, February 27, 2021
Assessing risks: Step into this simulation of airflow in a real classroom.
By BY NICK BARTZOKAS, MIKA GRÖNDAHL, KARTHIK PATANJALI, MILES PEYTON, BEDEL SAGET AND UMI SYAM from NYT World https://nyti.ms/3rdEhWZ New York Times
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