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To: jonrick46

You ought to spend a few minutes quietly reading this mask study from 1981. Then contemplate.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2493952/pdf/annrcse01509-0009.pdf

108 posted on 03/16/2021 9:07:50 AM PDT by zek157

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To: zek157

Bookmarked.

122 posted on 03/17/2021 3:02:19 AM PDT by Robert A Cook PE (Method, motive, and opportunity: No morals, shear madness and hatred by those who cheat.)

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