it seems to me the long form blogs from the lesswrong/rationalist crowd are slightly ahead (by a couple weeks) of twitter in assessing the actual scale or the calamity posed by the new variants and sluggish vaccine roll out, maybe because twitter was distracted by politics & 1/6
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With a tight fit (headbands or tying earloops behind your head using a clamp, added Al nose clamp) their high surface area and low breathing resistance there is virtually no outward leakage. So up to 99.2-99.4%* of my breath gets filtered, probably. https://www.cdc.gov/niosh/npptl/respirators/testing/results/MTT-2020-49.1_International__PowecomKN95_TestReport_Redacted-508.pdf …
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They are slightly bigger than the normal KN95 shape, which doesn't work as well (there is more leakage)
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