When you stop to really think about the human body, it's kind of amazing that it works as well as it does. After all, we're talking about thousands of parts and processes that all have to move in sink to create, well, life — no wonder things in the body can get really, really weird.

Below are 30 little-known facts about our bodies that will kind of blow your mind. From body hair to eye color to just how big the contents of our lungs actually are, these facts will make you appreciate your very complicated, highly efficient body more than you ever have before.

#1. Most babies are born with blue eyes. Exposure to UV light and melanin are what brings out their true color over time.

Most babies are born with blue eyes. Exposure to UV light and melanin are what brings out their true color over time.

#2. By age 60, you will have lost about half of your taste buds.

#3. A condition called synesthesia can cause senses to overlap. In fact, some people can taste words or hear colors.

A condition called synesthesia can cause senses to overlap. In fact, some people can taste words or hear colors.

Daniel M.N. Turner / NPR

#4. After eating too much, your hearing is actually a bit worse.

#5. A red blood cell can circumnavigate your entire body in under 20 seconds

A red blood cell can circumnavigate your entire body in under 20 seconds

#6. People with blue eyes tend to have a higher alcohol tolerance.

#7. The average human nose actually produces about a liter of mucus every day

The average human nose actually produces about a liter of mucus every day

#8. The largest cell in the human body is the female egg. The smallest? The male sperm.

The largest cell in the human body is the female egg. The smallest?  The male sperm.

#9. Higher intellect has been linked to excessive body hair.

#10. The average person farts about 14 times per day.

#11. Your heart begins beating four weeks after conception and doesn't stop beating until you die. It beats 100,000 times per day, and almost one million times a week.

Your heart begins beating four weeks after conception and doesn't stop beating until you die.  It beats 100,000 times per day, and almost one million times a week.

#12. The position of your body can affect your memory.

#13. Your brain is faster than a supercomputer.

Your brain is faster than a supercomputer.

#14. The surface area of a human lung (spread out) is equal to a tennis court.

#15. The acid in your stomach is strong enough to dissolve razorblades and pennies.

#16. Women tend to blink twice as much as men.

#17. It takes 17 muscles to smile and about 43 to frown.

#18. There are more bacteria in the human mouth than there are people on Earth.

#19. Human bones are stronger than steel.

#20. Your fastest-growing nail is on your middle finger.

#21. Women’s hearts tend to beat faster than men's.

#22. Your taste buds are replaced about every 10 days.

#23. Testicles hang between the legs to keep cool (inside of the body is a bit too hot for them).

#24. Babies can only see black and white when they are born.

#25. Every single person on Earth has a unique smell (except for identical twins).

#26. 1 in 10,000 people have situs inversus. In other words, their organs sit in reverse.

1 in 10,000 people have situs inversus. In other words, their organs sit in reverse.

#27. Fingernails grow up to four times faster than toenails.

#28. If unwrapped, the DNA in all the cells in your body would stretch 10 billion miles. In other words, from Earth to Pluto and back.

If unwrapped, the DNA in all the cells in your body would stretch 10 billion miles. In other words, from Earth to Pluto and back.

#29. The largest internal organ is the small intestine — so nevermind its name.

#30. Finally, the neurons in your brain create and send more messages than all phones in the world combined.

Finally, the neurons in your brain create and send more messages than all phones in the world combined.

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