Biohazard suits with HEPA filters are 100% effective.
N95 Masks are 95% effective.
Having any kind of covering over your nose and mouth will be more effective than no covering at all. If you don't already wear eyeglasses, you can wear other eye protection.
Masks made of fabrics are "One and Done". Once you take it off, discard it or wash it if it is a homemade mask that can withstand a trip through the laundry.
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Humility is not thinking less of yourself, its thinking of yourself less.
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