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Tag: double mask
Explainer: N95? KF94? Which mask is best at protecting against COVID-19?
Manojna Maddipatla and Leroy Leo via Reuters
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January 19, 2022
Are two cloth masks better than one for preventing the spread...
Catherine Clase, Charles-Francois de Lannoy, Juan Jesus Carrero, Roberto Pecoits-Filho, and Scott Laengert via The Conversation
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February 19, 2021