Everyone drop what you're doing and read this one tweet. (also, CC @zeynep)https://twitter.com/politicalmath/status/1242121273397760003 …
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Almost all the arguments about people don't do it right or false security apply to hand-washing more, and masks are quite likely more effective than handwashing (that's what a SARS review found, though both are necessary obviously).
Obvious point that nobody can really deny is that given asymptomatic transmission and limited testing, the only way is universal masking. And given how culture works, even if we had perfect testing and zero asymptomatic transmission, no way can we only tell the sick to mask up.
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