[ExI] all you wanted to know about masks

Tue Nov 3 14:54:06 UTC 2020

https://www.nytimes.com/interactive/2020/10/30/science/wear-mask-covid-particles-ul.html?campaign_id=34&emc=edit_sc_20201103&instance_id=23724&nl=science-times&regi_id=64159776&segment_id=43307&te=1&user_id=5e71139b79ab1433d07710d8f88356c8
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