vox.com/the-goods/22868641/chicago-school-closings-omicron-covid-remote-learning
cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/types-of-masks.html
tinyurl.com/WS-GuardMaskNerd
tinyurl.com/WS-MaskNerdYT
tinyurl.com/WS-FordFdnFilter
tinyurl.com/WS-MinPhyMask1
tinyurl.com/WS-MinPhyMasks2
We are now entering the sixth upsurge of the U.S. COVID pandemic infections as we move back into often poorly ventilated indoor winter classrooms with stressed-out teachers, understaffed schools, and unvaccinated or partially vaccinated kids, and it’s time to use the immense masking insights we have gained since fall 2020. We know the physics of how masks work, better masks work better, and there is no longer any shortage of high-quality affordable Personal Protective Equipment (PPE), especially N95, KN95, FFP2, and KF94 respirator masks including child-sized variants. There is no longer any reason for teachers (or anyone) to wear a cloth mask, a vented mask, or a paper surgical mask—we have much better alternatives. Staying safe is all about minimizing ∫{exposure}dt —which means no, it’s not hypocritical to take off your respirator to eat and then put it back on...