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Updated as of Nov. 2020, with more background about using them
https://www.dlee.org/discord/
https://www.dlee.org/discord/
Nov. 28th, 2020
Turns out the six feet guideline was based on 1930s science, pre-fluid mechanics, and the cold dry winter environments indoors mean droplets evaporate more slowly
https://scitechdaily.com/social-distancing-isnt-enough-to-prevent-infection-how-to-detect-covid-19-super-spreaders/
https://scitechdaily.com/social-distancing-isnt-enough-to-prevent-infection-how-to-detect-covid-19-super-spreaders/