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Scientific American

2020-11-14, 11:51
How to Use Masks during the Coronavirus Pandemic


What kinds of face coverings work for protection against COVID-19? How do you use them safely? A series of simple steps outlines the answers



-- Read more on ScientificAmerican.com


https://www.scientificamerican.com/artic...-pandemic/
www.chinaphonearena.com > Off The Wall > Tech & Science > [Sci-Am] How to Use Masks during the Coronavirus Pandemic