1. The average person walks past at least 16 murderers in their lifetime.
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Some badass on Reddit did the math for someone living in an average-sized city:
10 new people per day x 365 days per year x 71 years of living = about 260,000 separate individuals somebody might walk by; 260,000 people in a lifetime x 6 murderers per 100,000 people = 15.6, or about 16 murderers.
2. There are little bugs that live on your face and eat the dead skin off of it.
Wikipedia Commons / CC BY-SA 3.0 / en.wikipedia.org / Paramount Pictures
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.
3. In rare instances, dead women can give birth.
It's called "coffin birth," and can happen when a pregnant corpse releases gas while decomposing that expels the dead fetus out. This can happen within 48-72 hours of the mom's death.
—Eunice Villanueva, Facebook
4. Over 1,600 people have gone missing in US National Parks, never to be seen again.
FOX 5 / U.S. National Park Service
Unfortunately, these people tend to stay missing because tracking them is insanely difficult — even after the US government put an analysis and reporting system in place after 9/11.
5. There is a parasite that destroys the tongue of a fish and then replaces the tongue with its own body.
Wikipedia Commons / CC BY-SA 3.0 / en.wikipedia.org
Essentially it transforms itself into a living, parasitic, but fully functioning and otherwise harmless tongue. It's called cymothoa exigua.
6. The last person on Earth to have lived in the 19th century died a few weeks ago.
Emma Morano was born November 29, 1899, and died April 15, 2017. She was verified as the oldest Italian person to ever live.
7. In 1518, there was a dancing plague where about 400 people began to involuntary dance for days on end.
Physicians assumed that they were shaking off a fever. Some people died of a heart attack, exhaustion, or even strokes.
8. There's a parasite in cat poop that can literally control rats' minds, should they eat it.
It's called Toxoplasma gondii, and it changes a rat's brain function to make them drawn to the smell of cat urine, making it easier for cats to find and catch the rat — literally leading the rat to its death.
9. Every year, we unknowingly pass the anniversary of our death day.
Yournikonman / Getty Images / Anna Kopsky
10. Serial killer Dennis Rader would sometimes spend time in his victim's houses, hiding in their closets until they were at their most vulnerable.
Biography.com / Getty Images / mtreasure
Also known as the BTK Killer (bind, torture, kill), he'd kill entire families and steal things from their homes from the '70s to the '90s. ALWAYS CHECK YOUR HOUSE FOR MURDERERS.
—Megan Brooke Klaine, Facebook
11. There's a zombie fungus that basically enslaves ants for its own benefit until it kills them.
It's called desmidiospora myrmecophila, a furry, parasitic fungus that causes infected insects to behave strangely.
12. You're more likely to be killed by a cow than by a shark.
Wikipedia Commons / CC BY-SA 3.0 / en.wikipedia.org / Anna Kopsky
Cows can stomp on you while you're just skipping through a field and kill you. It's happened.
13. A jellyfish's mouth is also its anus.
Wikipedia Commons / CC BY-SA 3.0 /
Anemone and sea sponges also only have a single hole to eat and excrete through. Gross or efficient?
14. Some tumors can grow teeth, be filled with hair, or develop organs of their own. Seriously.
15. Men can get erections after they die.
Marcusphotography / Getty Images / BuzzFeed
They can also ejaculate postmortem. OMG.
16. Your brain can play tricks on you to make you see monsters in the mirror, called the Troxler Effect.
The Troxler Effect is an optical illusion that affects how you perceive things, both visually and mentally. Spooky.
17. And every time you swim in the ocean, you're basically bathing in a graveyard.
NPR / Public Domain
—Morgan Montgomery, Facebook