Tweets have *vastly* more distribution than many other outlets on this cloth mask versus medical grade mask paper. https://bmjopen.bmj.com/content/5/4/e006577 …pic.twitter.com/93lvHhCwwd
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this paper is also good. in think the bifabric masks are promising however.https://academic.oup.com/annweh/article/54/7/789/202744 …