Ars covers the efficacy of face masks

[Sam3]

Well then, how about this commentary by two expets on respiratory protection?

https://www.cidrap.umn.edu/news-perspect...sound-data

cidrap.umn.edu wrote: Sweeping mask recommendations—as many have proposed—will not reduce SARS-CoV-2 transmission, as evidenced by the widespread practice of wearing such masks in Hubei province, China, before and during its mass COVID-19 transmission experience earlier this year. Our review of relevant studies indicates that cloth masks will be ineffective at preventing SARS-CoV-2 transmission, whether worn as source control or as PPE.