Your ears secrete more earwax when you are afraid than when you aren't.
229
In Brazil, there's a species of cockroach that eats eyelashes, usually those of young children while they are asleep.
151
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
The chlorine smell in swimming pools is accentuated by the chemical's reaction with impurities (like poop.)
7