There are little bugs that live on your face and eat the dead skin off of it.
They're called demodex mites, and the older you are, the more there are in your follicles.
They're spread by skin-to-skin contact — try to forget that when you get a nice 'ol kiss from Gramma.
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Creepy Facts
RandomIf you're feeling brave enough, this book of creepy facts makes for some interesting read.