Keith Selin @Keithselin
Here is a thorough study with many supporting links on the efficacy of facemasks. The title of the study is "Facemasks in the COVID-19 era: A health hypothesis". And it's published by the US National Library of Medicine/National Institutes of Health. Yes, it's real science! Take from it what you will.

https://www.ncbi.nlm.nih.g...
03:02 PM - Apr 16, 2021
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