While we are desperate for more data on the efficacy of masks in the real world, it is tough to extrapolate from hamsters in cages.
Nonetheless, I thought it was interesting.
businessinsider.sg/photos-inside-…
People argue that masks may "reduce social distancing"-- this claim is not based on data, either.
I'm wearing a mask & I hope you do too.
#covid19
You'll be hard pressed to find anyone argue that high-filtrate masks don't work.