Wrong. Again. Lets see that bring you up to 310 tries, all failed
https://www.pnas.org/content/118/4/e2014564118
An evidence review of face masks against COVID-19
View ORCID ProfileJeremy Howard, Austin Huang, View ORCID ProfileZhiyuan Li, View ORCID ProfileZeynep Tufekci, Vladimir Zdimal...