A century before COVID, a doctor came up with the idea of using face masks to stop a deadly plague in China.
from WebMD Health https://www.webmd.com/lung/news/20200826/the-forgotten-science-behind-face-masks?src=RSS_PUBLIC
Thursday, August 27, 2020
The Forgotten Science Behind Face Masks
from WebMD Health https://www.webmd.com/lung/news/20200826/the-forgotten-science-behind-face-masks?src=RSS_PUBLIC
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