1. Tumors can have teeth and hair.
Most often found in ovaries and testicles, teratomas are a type of tumor that are made up of different types of tissue — from hair and skin to muscle and bone — and can range in size from 1 centimeter to 17 inches.

2. Your brain could power a (dim) lightbulb.
Your brain is made up of 100 billion neurons, which are capable of generating enough electricity to turn on a 15- to 20-watt bulb.

3. Your tongue can grow hair.
Hairy tongue is a completely harmless and surprisingly common condition, according to the American Academy of Oral and Maxillofacial Pathology. The tiny bumps on your tongue (aka papillae) are made out of keratin — the same protein that makes up your hair — so when papillae don’t shed like they’re supposed to, they grow longer and longer until the tongue looks, well, hairy.

4. Stomach acid is ridiculously powerful.
An empty stomach contains acid with a pH of between 1 (battery acid) and 3 (vinegar), meaning it could potentially dissolve metal.

5. Your mouth is made up of the same type of cells as a vagina.
Known as “stratified squamous epithelial cells,” they’re the most durable type of skin cell. Enough said.

6. You’re always looking at your nose — your brain just ignores it.
Just so you’re not distracted by the bridge of your nose every minute of every day, your brain simply filters it out. This is called “unconscious selective attention” and helps us stay focused on more important things, according to Scientific American.

7. Your blood vessels are thousands of miles long.
If you laid out your blood vessels end to end in a straight line, it would be almost 100,000 miles long, according to The Franklin Institute. That’s about four times the circumference of the Earth.

8. The amount of saliva you produce in a lifetime could fill 227 bathtubs.
The average human produces as much as 1.5 liters of saliva every day, according to a study in the Journal of the American Dental Association. Multiply that by the number of days in the average American’s lifespan (78.8 years = 28,762 days) and you’ve got yourself 43,143 liters — or 11,397 gallons — of spit.

9. Your nose can distinguish at least 1 trillion different smells.
According to Howard Hughes Medical Institute, scientists used to think we could only distinguish 10,000 scents, but new research proved our noses are a lot more powerful than we thought.

10. Your heart isn’t on the left side of your body.
If you accidentally forgot which hand to put over your heart as a kid during the Pledge of Allegiance, don’t feel bad. Your heart is actually located smack-dab in the middle of your chest, according to the National Heart, Lung, and Blood Institute.

11. Your pinky finger might look tiny, but it’s mighty.
In fact, you’d have to say goodbye to a whopping 50 percent of your hand strength if you didn’t have one, a certified hand therapist told the New York Times.

12. Your brain automatically fills in your blind spots.
The brain is an amazing thing, and it lends your eyes a helping hand when you experience a blind spot by actually filling in the missing information. Take this test from the University of Washington to see (pun intended) what we mean.

13. White might be a relatively new skin color.
More research is needed, but findings in an April 2015 study suggest that lighter features — including pale skin, blonde hair, and blue eyes — only began to develop in Europeans about 8,000 years ago.

14. You got your fingerprints when you were still in the womb.
Babies get their very own set of unique fingerprints before they’re even born. The “friction ridges” begin to develop around 13 weeks, when the entire fetus is only about 3.75 inches long, according to the American Pregnancy Association. How cute is that?

15. The germiest part of your body isn’t where you’d expect.
Your mouth is home to hundreds of bacteria — 700 different species, to be exact, according to a study in the Journal of Clinical Microbiology. That means giving someone a 10-second slobbery smooch can transfer 80 million bacteria alone!

16. Your liver is the only organ that can regenerate.
Just like a lizard can grow back its tail, your liver can completely repair itself in only 30 days, according to The University of Iowa.

17. Your lip color has more to do with oxygen than lipstick.
Blessed with a naturally rosy pout? You can thank the oxygen-rich blood flowing through capillaries underneath the thin skin of your lips for that, according to Dr. Beth Ann Ditkoff. This also is why your lips change to a bluish hue when you’re low on oxygen.

18. Our fingers and toes get pruney in water as a survival mechanism.
The wrinkly skin helps your body grab things better in wet conditions. Thanks to the wrinkles, water is channelled out of the way and we can hold onto slippery surfaces more effectively, according to a 2013 study in Biology Letters.

19. Tastebuds aren’t only on your tongue.
They’re also on your lips, cheeks, roof of your mouth, and lining of your throat, according to the National Institute on Deafness and Other Communication Disorders.

20. Your belly button is a scar.
Your first scar, to be exact. The funny-looking body part is essentially scar tissue left behind from the umbilical cord that connected you to your mother.

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