One comment about masks and nonlinearities that these imbeciles are not getting.
Reducing exposure to viruses by 30% thanks to an "imperfect" mask does not mean reducing risk of contracting the disease by just 30%. By convexity, it must be more than 30%, can even be 95%.
For 2 pple masks act a 2-way filter, 1-p^2. Yuuge.
We know masks work (from other combined statistical signals). Now let's back up the convexity of probability of infection to particle concentration.
How many people contracted COVID while wearing surgical masks? How many w/N95? How many with cowboy scarves?
(Assume for now homogeneity. We are looking for convexity, not measurement).