Covid is the size of 50-150nm. A 3m mask filters down to 150nm. Cloth masks do much worse. Masks are useless. They only make you sicker by allowing you to breed pneumonia and other bacterial illnesses in your mask. Stop wearing masks sheep.
Covid is the size of 50-150nm. A 3m mask filters down to 150nm. Cloth masks do much worse. Masks are useless. They only make you sicker by allowing you to breed pneumonia and other bacterial illnesses in your mask. Stop wearing masks sheep.
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