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Physicist Explains Why Face Masks May Stop Spitballs But Can't Stop Covid
by bill - 2020-12-06 ( life / health / covid / masks )
Read the rest here muchadoaboutcorona.ca/spitballs/
"At first, this spit-protection theory sounds valid enough; but give it two minutes of investigation and it quickly loses its credibility."
blog version — similar posts here — ... and elsewhere
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