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28 Cool Facts About the Human Body You Might Not Know

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The human body and all of the daily functions it carries out are nothing short of miraculous. It’s pretty darn amazing when we stop to realize that our body innately knows what to do to keep us alive (breathe, pump blood, grow babies, etc.).

Did you know that the human body contains roughly 37.2 trillion cells? That’s just a small sample of what’s to come. If you want to know more, keep reading. 

It’s time to get into some of the most intriguing, weirdest, silliest, and grossest facts about the human body.

1. Your Body Gives Off a Small Amount of Light

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Yep, you read that right, starting the list of facts off with a weird but true fact: your body is literally glowing right now. Although, this light is far too faint for the eye to notice. If you’re wondering if this ties into auras, you’re on the right track. 

2. An Adult’s Blood Vessels Could Circle the Earth’s Equator Over Two Times If Laid End to End

Blood System many small capillaries branch out, blood Vessels in a Human Body
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The Earth’s circumference is approximately 40,075 kilometers (24,901 miles), and all the blood vessels in your body can circle that enormous amount two and a half times over. Let that sink in for a few seconds. 

While blood vessels are pretty small, their network is exceptionally long. 

3. Your Brain Is Often More Active When You’re Sleeping

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Your heart rate and blood pressure increase during deep sleep, leading to dynamic brain activity during the REM stage. REM sleep occurs for at least two hours every night and plays a significant role in creating memory and information processing. 

4. You Produce About 1 Liter of Saliva Each Day

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Gross human body fact alert – you produce around 23,000 liters of spit in your lifetime. Funny enough, there’s a good reason behind this crazy amount of saliva: it moistens the mouth, neutralizes harmful acids, and aids chewing and swallowing. 

Producing more saliva than usual is hypersalivation, often caused by pregnancy, allergies, strep throat, heartburn, etc. 

5. There Are About 67 Different Types of Bacteria in Your Belly Button

A woman making heart sign using her hand around her belly button
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If you’re wondering why the belly button contains so many bacteria, you’re not the only one. These invisible pests seem to flourish here for a silly yet logical reason: it’s warm and moist. Bacteria thrive in these exact conditions. However, many microbes, such as Staphylococcus, do not belong in the belly button, which causes staph infections

6. Information Travels at 268 mph (430 kmph) Along the Nerves

Synapse and neurons in the human brain
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Here’s an epic fact about the human brain. Information zooms at about 268 miles per hour (430 kmph) along the nerves. This lightning speed results from an electric pulse generated by a stimulated neuron. This is what allows for quick reflexed when the human body is in danger. A disruption in this process can cause an epileptic seizure. 

7. Humans Are the Only Species That Can Blush

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Who thought that blushing would be such a huge flex? So far, we’re the only known species on earth with this adorable ability. Blushing is linked to embarrassment – a complex emotion that only humans experience. It’s caused by dilating blood vessels in the face during humiliation.

8. The Human Heart Beats More Than Three Billion Times During the Average Lifespan

ECG abstract backgrounds with human 3D rendered heart
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Suppose you live up to 80 years. This means that your heart will have beaten more than three billion times. 

9. Your Blood Makes Up Roughly 8% of Your Body Weight

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Roughly 7-8% of an adult’s body weight is blood. The average man has about 12 pints of blood, while a woman has nine. 

10. You Lose 8.8lbs/4 kg of Skin Cells Annually

A close-up of human body, skin shedding
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Shedding skin is a natural human process and essential to our health. Thankfully, we don’t shed skin like snakes or lizards do (how horrifying that would be!), but we do lose a lot of it to replace dead or damaged skin cells with healthy ones. 

11. Human Teeth Are as Strong as Shark Teeth

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How interesting is this? Research suggests they’re precisely the same hardness. Apparently, human teeth have an enamel layer on the outside that is exactly as hard as the enameloid found on the outside of a shark tooth. 

12. The Left Lung Is 10% Smaller Than the Right One

Senior doctor examining a lung radiography
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There’s a pretty good reason for this oddity. Your left lung is smaller to make more space for your heart. The left lung has no middle lobe and has two parts the right one doesn’t have: the cardiac notch (where your heart fits) and the lingula, the equivalent to the right middle lobe. 

13. Listen Up: Your Ears Never Stop Growing!

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The rest of your body may stop growing after you’ve gone through puberty, but the ears refuse to listen and get with the program. Instead, these stubborn organs allow gravity to take the wheel, causing the lobes to elongate and the cartilage to grow. 

14. The Nose Can Differentiate a Trillion Scents

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According to researchers, what the nose knows may as well be limitless. Who knew there were so many different scents? Well, the nose knows and can distinguish between a trillion odors. 

15. The Average Joe Has About 8,000 Taste Buds On Their Tongue

Close-up of a human Tongue
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The nose is not the only body part with epic talent. Adult tongues have between 2,000 and 10,000 taste buds. This explains why people with more taste buds are called ‘supertasters’ and why some people are better in the kitchen than others. 

16. The Heart Is the Only Muscle That Never Tires

A Human heart
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Considering the heart beats about 100,000 times daily, it never gets tired of this constant work. After all, it’s why you’re alive and kicking, so this makes complete sense. The heart contains unique muscle cells called cardiomyocytes that are highly resistant to fatigue. 

17. The Body Has More Than 2 Million Sweat Pores

A runner's body sweating
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Here’s a smelly fact for you. Known as eccrine glands, the human body has between two to four million of these sweat pores. These are present throughout the body, but most are found in the feet, palms, groin, and armpit soles. The average person sweats three to four liters per hour or as much as 10 liters daily. 

18. The Whole Surface Area of the Skin Gets Replaced Every Month

Human skin super macro texture
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Yep, your entire skin replaces itself with brand-new cells each month. This means that you’ll have 1,000 different skins in your lifetime. Wow, you’re practically a new person every month. 

19. On Average, Some People May Fart Enough in One Day To Fill a Party Balloon

A woman wearing gray top and black jeans, Touching her belly
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Seriously, who is out there conducting these experiments? To give you the full picture: it would take an average of 79 farts to fill a standard 11-inch party balloon. While gas is a normal part of life, people shouldn’t be farting more than 25 times per day. Anything beyond that is considered excessive. 

20. Your Brain Density Continues to Increase as New Neuronal Connections Occur

Human active brain
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This is because the brain’s structure is constantly changing. According to neuroscientists, after eight years of age, the gray matter of certain areas begins to decrease, but the density of the gray matter increases. 

Increased density enables high processing and further mental development.

21. You Blink About 10 Million Times a Year

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The average person will typically blink between 14,400 and 19,200 times per day. Someone that is tired will blink more often and for a longer duration. Interestingly, a person’s blinking may increase when asked an unprepared question. 

The lack of oxygen and nutrients causes dryness, infections, and blurry vision if you don’t blink. 

22. The Cornea of the Eye Doesn’t Get Any Blood Supply and Receives Oxygen From the Air

Close Up of a Human Eyee
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The only part of the human body with no blood supply is the cornea, which gets oxygen directly through the air. This ‘super-human’ ability is also why the cornea is the fastest healing tissue, being able to heal from abrasions within 24-36 hours. 

23. The Body Has So Much Fat That You Could Make 7 Bars of Soap With It

fat man wanting to lose weight
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How scientists figured this out must have been wild. Hopefully, no one was turned into soap after their passing – oh, right, this has happened before. A female serial killer named Leonarda Cianciulli became known as “The Soap-Maker of Correggio” after murdering three victims and making soap from their corpses. 

A healthy body fat in men should typically be 8-19%, whereas a healthy range for women sits between 21-33%. 

24. The Human Brain Can Survive Up to 6 Minutes Without Oxygen 

Human Brain
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After four to six minutes without oxygen, the brain will die. Moreover, the brain uses a fifth of all the oxygen in the body, and if it doesn’t receive enough, brain cells will start to die. The temporal lobe (at the temples) is the first part of the brain to die, which is also where memory is located. 

25. Teratomas Are a Type of Tumor That Can Grow Teeth and Hair

Woman sitting on her couch shocked surprised glasses blazer
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As if tumors aren’t scary enough, some can grow hair and teeth. If we’d never discovered microscopes, life would be peaceful, not knowing all these tiny critters exist within our bodies. 

Alas, the teratoma tumor is a germ cell that contains immature or fully-formed tissue, including bone, hair, teeth, and muscle – terrifying.

26. Astronauts Grow Up to Two Inches When in Space

astronaut in space
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The human body is exceptional as it can grow up to three percent taller in space. That means a six-foot astronaut can be two inches taller. So, if you’ve ever been a bit insecure about your height, you may want to consider a career as an astronaut (jokes). 

27. Your Heart Can Sync to the Rhythm of the Music You Listen To

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This is probably the coolest fact on here and proves the meaning behind the saying, “Music moves your soul.” Relaxing music may lower your heart rate, making you feel at ease. In contrast, up-tempo music hypes you up. 

Sound processing starts in the brain, which controls the heartbeat and respiration — this results in the rhythm of the music affecting your heart rate. 

28. The Longest Recorded Pregnancy Lasted 17 months

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Here’s one lady with a heck of a ‘bump-y’ road on her pregnancy journey (get it?). The average woman carries her baby for nine months. However, Wang Shi from China’s central Hunan province has set a new Guinness World Record with her 17-month-long pregnancy in 2016. 

57 Psychological Facts About Humans That Might Shock You

High Five of Male and Female
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Psychology says that humans are always curious about knowing their minds better. So it’s no surprise that you’re here right now. While there are many things left to uncover and decipher – let’s start with what we do know. 

57 Psychological Facts About Humans That Might Shock You

41 Interesting Facts About North America Most People Don’t Know

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There’s a lot more to North America than just holiday brochures and popular culture, though. As a region, it boasts several impressive geographic features and anomalies. Because of its size, it has incredibly diverse bioculture, people, and even natural phenomena worth exploring.

41 Interesting Facts About North America Most People Don’t Know

23 Psychological Facts About Depression You Might Not Know

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Imagine suddenly losing interest in some of your most well-loved activities or feeling a sense of hopelessness you can’t shake. Or imagine having a sense of foreboding and sadness that seemingly came out of nowhere. Sometimes, depression can make its way into your life without warning, and it’s never a fun experience. 

23 Psychological Facts About Depression You Might Not Know

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