Of microns and masks

Coronavirus broken down got this from https://www.yaktrinews.com/coronavirus-cases-surpass-2000-in-yakima-county-more-than-500-recover/

I found this article when looking up the what the deal is with microns and masks. The net net is that mask is better than no mask. How much for how long and what percentage etcetera is in the link below. So I bought in early March when all the lockdowns started the O2Canada Maskā€¦… Continue reading Of microns and masks