Hmmm... the heart of the average human will, over the course of their lifetime, beat over 3.5 billion times, and pump in excess of forty-two million gallons of blood.
The average human will also "lose" 96 bones while growing up, but gain two (their kneecaps), replace their skeleton completely once every ten years or so, and produce 10,000 gallons of spit.
On the "even creepier front", there two entire species of mite which live in human eyebrows and eyelashes (and most humans have them). They feed on excess oil and dead skin cells produced there, drink sweat, and keep everything neat and tidy... if you don't count the fact they're constantly going to the bathroom, having sex, laying eggs, and dying on your face.
On the good side, you can thank their tireless efforts for the fact your eyebrows and eyelashes never seem to get oily, even when the rest of your hair does. On the bad side, you can also thank them for most of those inexplicable bouts of itching on your face and forehead when you're trying to go to sleep. They like to go for a walk when it gets dark.
I would also like to take this opportunity to point out mites are a type of arachnid. This, of course, means you essentially have an entire colony of microscopic spiders living on your face.
So is anyone still reading this, or has everyone panicked and run off to the bathroom to furiously scrub their eyebrows?