RT @CathNoakes: This is a really good explanation of how an N95 mask works. It’s not just a sieve. And a lot of this also applies to 3 laye… 0 atbildes
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Aigars Mahinovs (2021-09-22 15:33:22) |
RT @CathNoakes: This is a really good explanation of how an N95 mask works. It’s not just a sieve. And a lot of this also applies to 3 laye… | |