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RobertRoberts
on Jan 12, 2022
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Switching to an N95 mask gives a 75x boost in Covi...
Good question, doesn't it depend on environment? If you are alone in the woods, the mask will always work forever.
If you are in a small room with a dozen infected people coughing...?
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If you are in a small room with a dozen infected people coughing...?