What does a mask do? Blocks respiratory droplets coming from your mouth and throat.
Two simple demos:
First, I sneezed, sang, talked & coughed toward an agar culture plate with or without a mask. Bacteria colonies show where droplets landed. A mask blocks virtually all of them.
I have autoimmune disease, COVID can seriously harm/kill me. Leaving Waterloo thanks to St. Patrick's on Ezra. Schools are closing worldwide - you kids are selfish & dumb