Compiling Information about COVID19 transmission, masks, filtration, schools, etc.

Trying to collect some of the various information about COVID19 transmission and related topics including masks, schools, CO2, variants, etc. Mostly from Twitter threads and News articles Masks Wall Street Journal: Double Face Masks? N95? Protect Yourself Against New Covid-19 Variants With These Mask Upgrades Some important lines Double masking is wearing one mask over …