And that any mask can be of benefit!
I think the last paragraph is interesting...where it talks about lowering the viral load to build immunity with a homemade mask?
There’s a tipping point for all masks as well. Notice that the surgical mask can be 80% effective or not.
Yes, that caught my eye. Not sure I would be good at making a homemade mask, but necessity causes a lot of preconceived notions to be re-thought.