Learn about what? Masks are effective against flu? We know that for a century. | Hacker News

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		ergocoder on Jan 25, 2021 \| parent \| context \| favorite \| on: 18.7 Million Americans Vaccinated Learn about what? Masks are effective against flu? We know that for a century.

hanniabu on Jan 25, 2021 [–]

This isn't the flu and they didn't know much about it at all initially

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