This is your N95 with a valve. This is your N95 without.

The Morning News https://ift.tt/3ll5QdL

N95 😷😷with valves don't workhttps://t.co/qGZIEzE1Sh @AIP_Publishing today pic.twitter.com/mI9pVmFtfa

— Eric Topol (@EricTopol) November 10, 2020

Via Kottke

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