> For a disease that we now know is airborne/aerosol spread rather than airborne/droplet, N95 and KN95 masks are highly effective, a two layer cloth mask fit ti

> For a disease that we now know is airborne/aerosol spread rather than airborne/droplet, N95 and KN95 masks are highly effective, a two layer cloth mask fit tightly over a surgical mask is moderately effective, and a cloth mask by itself is largely for show. I mean, who's "we"? I knew this back in January 2020.