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replied 1704d
Kaizen
And here is an example of a *useful* study
https://pubmed.ncbi.nlm.nih.gov/32917603/
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replied 1704d
* Surgical mask, 1% particles allowed through
* Double-layer bandana, 25-80 % particles
* N95 mask, no exhalation valve, fitted- 0.1 % particles
* Control, no mask 100% particles
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(full text: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7467698/ )


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