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[–]infocom6502[S] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

I go on fundamentals. In this case it's physics and fluid mechanics. You are attenuating expulsion of droplets and thus decreasing (not eliminating) risks of contamination, thus reducing the range of the radius of moderate risk.

This fluid mechanics effect is also why these are used in surgeries.

SARS2 is not a natural virus. And even if it were natural, not all natural viruses are harmless. Some definitely are horrible as eff**.