I review a mask study published in the Journal of the American Medical Association (JAMA) from a physics perspective

Here’s the study. The authors are a couple of MDs. let’s look at their spiel. “COVID-19 spreads primarily through respiratory droplets exhaled when infected people breathe, talk, cough, sneeze, or sing. Most of these droplets are smaller than 10 μm in diameter, often referred to as aerosols.” “Most are smaller than 10 microns in diameter….”