Like condoms, masks fail when you don’t wear them properly.
But condoms still work even when everyone else is stupid and don’t. Cloth masks, however, need everyone to wear them.
Masks for all. Pass it on. #Masks4Allpic.twitter.com/CbEVoaqjzv
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In theory, a single sperm can cause a pregnancy. In practice, a man with a low sperm count can be unable to get a woman pregnant despite secreting millions of healthy sperm per ejaculation. So, there is a dose-response relationship even with conception.
In theory, a single virion could cause a case of covid, but in practice, it usually takes many more than that.
I think the point is masks for all. Arguing about the quality of an analogy is the terrible part.
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