Humans have been puzzled by things like the depths of the ocean and outer space. But one equally mysterious object has been standing right in front of you when you look in the mirror. It’s a human body.
And one TikTok creator named Knowledgesaurus has been stripping away the mystery surrounding it in a series of “How Rare Is Your Body?” videos. From explaining what percentage of people have features like cracked tongue, angled palm crease, or an extra rib, to counting how many people have the ability to write with both their right and left hands, or can make a clover out of their tongue.
The informative and fun videos gained Knowledgesaurus immediate popularity with millions of views and 1.3M followers, so let’s see some of the most interesting body facts that will pump your biology knowledge muscle so you can show it off in the next trivia session.
#1
25% of people sneeze when they’re exposed to direct sunlight. It’s called the photic sneeze reflex.
Image source: knowledgesaurus, Mikael Blomkvist
#2
30% of people can flare their nostrils on command. However that muscle has very little use and is usually weak, so a lot of people can’t do it on command.
Image source: knowledgesaurus, Pat David
#3
Only 12% of people have tetrachromacy – the ability to see a lot more colors than the majority of people. They can see about 10 times as many shades and colors as someone with normal vision.
Image source: knowledgesaurus, lionstalkscience
#4
2% of people naturally have red hair. In order to have a child with this hair color, both parents need to possess the gene, and while redheads make up a tiny part of the population, one study found that 30% of ads have people with red hair in them.
Image source: knowledgesaurus, Monstera
#5
Less than 1% of people can hear colors or see sounds (synesthesia).
Image source: knowledgesaurus, TEDxPeachtree Team
#6
9% of people can taste the soap taste in cilantro. Cilantro contains the chemical that is also a byproduct of soapmaking.
Image source: knowledgesaurus, Michael Lehet
#7
5% of people have amber eyes – golden or coppery with flakes of gold, green or brown. Amber eyes are very common in dogs, bird and fish.
Image source: knowledgesaurus, Eric May
#8
Less than 1% of people have this small little hole right on their ear. Some evolutionary biologists claim this used to be a gill on humans.
Image source: knowledgesaurus, AdamMichaels784
#9
24% of people can raise one eyebrow, however you can learn to do this as well.
Image source: knowledgesaurus, Lee Haywood
#10
10% of people have something called Morton’s toe. It’s when your big toe is shorter than the one next to it. The Statue of Liberty actually has a Morton’s toe as well.
Image source: knowledgesaurus, Jonnystahl
#11
Only 33% of people can whistle. Almost everyone has the ability to whistle, it just takes the right techniques.
Image source: knowledgesaurus, Sora Shimazaki
#12
Only 1% of people are ambidextrous – they have no preference for the use of right or left hand.
Image source: knowledgesaurus, alamelu24
#13
1% of people need less sleep than the rest of us. These people have Sleeper Syndrome which allows them to go through a sleep cycle faster than an average person.
Image source: knowledgesaurus, Andrea Piacquadio Andrea Piacquadio
#14
35% of people have no wisdom teeth. Wisdom teeth used to serve a purpose but now they no longer do, which is why we take them out so they don’t get infected while they’re pushing through your gums. If you don’t have wisdom teeth, I’m jealous of you.
Image source: knowledgesaurus, Anna Shvets
#15
83.7% of people can roll their tongue, but only 14.7% of people can make a clover out of their tongue.
Image source: knowledgesaurus, TheEnigmaticHaze
#16
4% of people have Raynaud’s syndrome. This is when a part of your body, usually your fingers or toes, starts to turn white when exposed to low temperatures. It’s your body’s overreaction to cold or distress.
Image source: knowledgesaurus
#17
Only 10% of people have Darwin’s tubercle – the little bump on the outside of your ear. It’s believed that people who have this are better at sensing voice tonality.
Image source: knowledgesaurus, Dbenbenn
#18
Less than 1% of people in the US have AB-Negative blood. There’s also something called Golden blood, which only about 40 people in the world have, and it’s completely different than any other blood.
Image source: knowledgesaurus, Vegasjon
#19
16% of people can make a roaring noise in their head using their jaw. They’re able to do this because they can control a small muscle in their jaw that deafens chewing, but when it is flexed it makes a roaring noise.
Image source: knowledgesaurus, Ono Kosuki
#20
Less than 1% of people have unbreakable bones. This is caused by a mutation in one of the genes that causes the bones to be up to 8 times denser.
Image source: knowledgesaurus, Mikael Häggström
#21
35% of people can gleek. Only 1% of people can do it on command. Gleeking is when you’re spitting saliva from under your tongue and it squirts out.
Image source: knowledgesaurus, g0lb0
#22
Less than 1% of people are born with a white patch of hair. It is called poliosis, which is caused by the lack of pigment called melanin in the hair follicles.
Image source: knowledgesaurus, Klaus D. Peter
#23
Only 5% of people have arched fingerprints. Most people have looped and whorled fingerprints.
Image source: knowledgesaurus, Noonifer
#24
Less than 1% of people have their heart on the right side of their body. Surprisingly, this doesn’t normally come with any negative consequences.
Image source: knowledgesaurus, millenniumxl-20
#25
Only 25% of people have dimples. You can have either two, or just one. Dimples are also hereditary, so if either of your parents has a dimple, it’s more likely you’ll have one as well.
Image source: knowledgesaurus, Jacob Mejicanos
#26
20% of people have a gap between their two front teeth. What normally causes this is a discrepancy between the jaw size and the teeth. A lot of celebrities have this and don’t correct it because they think it makes them unique.
Image source: knowledgesaurus, Paulblank
#27
Only 2% of people naturally have blonde hair. If you narrow it down just to white people in the United States, that percentage goes up to 5%.
Image source: knowledgesaurus, Chris Blonk
#28
Only 10% of people have birthmarks. They’re usually oval in shape and come in a coffee type color.
Image source: knowledgesaurus, Ben Crowe
#29
70% of people bend their head to the right when kissing. Your brain is the cause for this. The left side of our face shows more emotion so we want to give our partner the more emotive side and we tilt our head to the right.
Image source: knowledgesaurus, henri meilhac
#30
1% of people have a double row of eyelashes. While this might look like something a lot of you are jealous of, it actually can cause a lot of problems.
Image source: knowledgesaurus, lipstickplant
#31
Less than 1% of people have pointy or elf-like ears. It’s an abnormality called Stahl’s ear, it’s usually corrected early in life.
Image source: knowledgesaurus, christinev8
#32
Only 35% of people have 20/20 vision. 2/3 people cannot see perfectly.
Image source: knowledgesaurus, Karolina Grabowska
#33
25% of people have perfect teeth and never need braces or any orthodontics. 45% of children need braces, but 75% need orthodontic care.
Image source: knowledgesaurus
#34
14% of people don’t have this muscle – Palmaris Longus. This muscle was developed when our ancestors were big tree climbers. If you want to see if you still have it, pull back your palm on a flat surface, touch your pinky and thumb together and slightly lift them and you should see that ligament pop out.
Image source: knowledgesaurus, Couch-scratching-cats
#35
6% of people can vibrate and rapidly shake their eyeballs back and forth.
Image source: knowledgesaurus, ROTFLOLEB
#36
10% of people can touch their nose with their tongues. In medicine, this is called the Gorlin sign.
Image source: knowledgesaurus, cheshielynx
#37
20% of people are double jointed. This is thought to be genetic and due to a variation in collagen in your connective tissues.
Image source: knowledgesaurus, Rocky Mountain Goat
#38
4% of people are colorblind. Color blindness occurs in 8% of men and 0.5% of women.
Image source: knowledgesaurus, Simon Strandgaard
#39
Less than 1% of people can give themselves goosebumps on command. The majority of people get them when they’re cold or listening to music, but some can give themselves goosebumps whenever they want to.
Image source: knowledgesaurus, Ildar Sagdejev
#40
5% of people have a double hair whorl.
Image source: knowledgesaurus, HorsePunchKid
#41
Only 12% of people dream in black and white.
Image source: knowledgesaurus, Andrea Piacquadio
#42
Only 1% of the population can lick their elbow. The people that can do this usually have either a long tongue or a short forearm, or both.
Image source: knowledgesaurus, meikomac
#43
10% of people are left handed. Left handed people tend to live shorter lives.
Image source: knowledgesaurus, ThisIsEngineering
#44
25% of the population snores regularly.
Image source: knowledgesaurus, Kampus Production
#45
8.4% of people have a counterclockwise hair whorl on their head, while the majority has a clockwise one.
Image source: knowledgesaurus, Noj Han
#46
8% of people still have chimp-like feet, that are specifically adapted to climbing trees. This is characterized by a mid-foot arch. If you want to check if you have this, see if you can bend the ball of your foot as well as the region half-way between your heel and the ball of your foot.
Image source: knowledgesaurus, Anna Shvets
#47
Only 4% of people have an outie belly button. Believe it or not, doctors can’t choose if you’ll have an innie or an outie belly button, things like the belly button itself and the fat beneath it determine what it will look like.
Image source: knowledgesaurus, Kytrez
#48
Less than 1% of people have an extra rib. Most people are born with 24, but some have 25 ribs. The 25th is called a cervical rib.
Image source: knowledgesaurus, pxhere
#49
25% of people have a Hitchhiker’s thumb – when the upper part of the thumb can bend 90 degrees backwards. It’s caused by a certain gene.
Image source: knowledgesaurus, Sudo_Nymn
#50
About 20% of people have a pupil that is bigger than the other. This is called anisocoria, it can be a very small, or a very big difference.
Image source: knowledgesaurus, Tair1978
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