Testing 14 Different Face Masks
Researchers from Duke University studied 14 different masks by measuring filtration of expelled droplets during speech.
The researchers offer a "simple optical measurement method" that is both "inexpensive and can be built and operated by non-experts".

BEST MASKS
Top-Tier: "Fitted N95-14" and "Surgical-1"
2nd-Tier: "Poly/cotton-5" and "PolyProp-4"
3rd-Tier: "Cotton5-13" and "Cotton2-7"
WORST MASKS
Bottom-Tier: "Neck Gaiter-11"
2nd-Bottom-Tier: "None"
3rd-Bottom-Tier: "Bandana-12"
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