RT @sciam: Any mask worn for day-to-day protection against COVID-19 is going to be imperfect, at least for now. A handful of best practices can help make the most of our imperfect personal protection: https://t.co/rs4gIyrx2q https://t.co/nQqVgT8xrQ

Any mask worn for day-to-day protection against COVID-19 is going to be imperfect, at least for now. A handful of best practices can help make the most of our imperfect personal protection: https://t.co/rs4gIyrx2q pic.twitter.com/nQqVgT8xrQ

— Scientific American (@sciam) November 18, 2020

from Twitter https://twitter.com/deabigt

November 18, 2020 at 02:04PM
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