Some people say that today there are almost no “blank spots” left on our planet – that is, places completely unexplored by humans. And therefore, supposedly, life today has become more boring than, say, a hundred or two hundred years ago. Well, that’s definitely not true.
On the one hand, the depths of the oceans still hold many mysteries, and on the other, there’s so much we still don’t know about what directly surrounds us. What’s more, we don’t even know much about our own bodies! Still don’t believe me? Then please feel free to read this list of interesting facts, made for you by Bored Panda!
More info: Reddit
#1
Your tattoo ink is held in place by an army of living immune cells (macrophages) that don’t know what to do with it. As they age and disappear, new guys come to the front line to hold the ink in place.
Image source: yakshamash, freepik
#2
So, you know how people with schizophrenia tend to hear voices, telling them all kinds of potential bad stuff…
Well, what do you think happens to people who were born deaf, but then get schizophrenia?
It turns out that if they were taught sign language, the “voices” come out as visions of disembodied hands signing at them to tell them the same kinds of bad stuff.
OTOH, people born blind apparently never get schizophrenia.
Image source: NerdyWeightLifter, freepik
#3
I was just telling my kids about how if you put on special glasses that turn your vision upside-down, after a few days of wearing them your brain will ‘correct’ your vision back to right-side up. At that point without the glasses your ‘normal’ vision is upside down and takes a few hours to go back. I believe theres a paper by George Stratton about it.
Image source: extropia, senivpetro
A few days ago, in the AskReddit community, the user u/wassim_elia posed the question to netizens: “What’s an interesting fact about the human body that a lot of people don’t know?” The result was a thread that, in just a couple of days, has already garnered over 3.6K upvotes and around two and a half thousand various comments.
From amusing coincidences and absurdities to truly profound scientific opinions, netizens’ “body facts” are astonishingly diverse. And the lively discussion surrounding many of these opinions and things truly makes them even more interesting. So, please read this selection of over three dozen of the most exciting pieces from this thread!
#4
When you do not get enough sleep, your brain can actually start eating itself. Microglial cells, which are responsible for cleaning up waste in the brain, begin breaking down and consuming healthy neurons and connections, not just damaged ones. This process, known as astrocytic phagocytosis, increases when you are sleep-deprived. Over time, this can lead to memory problems, slower thinking, and an increased risk of diseases like Alzheimer’s.
Image source: disease-detective, drobotdean
#5
If you ever need a kidney transplant, they don’t remove an old kidney they just add a third one.
Image source: sharloops, sweet_tomato
#6
Located in the cochlea in your inner ear there are about 16,000 hairs called stereocillia. About 4000 of them are primarily responsible for your ability to hear. If you lost all 4000 hairs you would be deaf. If you lose a substantial amount of those hairs, your hearing will be reduced. Loud sounds, like machinery, explosions, cars and bikes and amplified music destroys those hairs. There isn’t really a “may harm” or “might damage” concept, just the degree of damage done when these loud sounds impact the hairs in the cochlea. Once damaged, these hairs never grow back. You have around 4000 and that is all you will have in your entire life. The more you lose, the worse your hearing will be. Forever.
Image source: markmakesfun, EyeEm
The evolution of human views on our own bodies is strikingly uneven. Two thousand years ago, Chinese and Roman doctors performed complex surgeries and inserted dentures – and just a couple of centuries later, millions of people in Europe seriously believed that humans were literally molded from a special kind of clay.
Some even considered attempting to understand how our bodies function as deeply sinful, while others, like Leonardo da Vinci, drew countless drawings of human muscles and bones to achieve maximum realism in their paintings. And so it has been throughout almost all of human history.
#7
A baby girl is born with all of the eggs she will ever produce. This means when her mother was a fetus, the egg that would someday become her was carried in her maternal grandmother’s womb.
I adored my maternal grandmother and was extremely close to her. Knowing that she carried and nurtured part of me is such a beautiful thought.
Image source: punkolina, ponomarencko
#8
There’s regulatory mechanisms for the regulatory mechanisms that regulate gene expression. Triple regulation.
Image source: priv_ish, anyaivanova
#9
How about the recurrent laryngeal nerve, the nerve that runs from the brain to the larynx? Now you’d think that in humans, that would be a pretty short trip.
And you’d be wrong.
In fact, the nerve comes down from the brain, goes screaming right past the larynx and down to the vicinity of the heart, where it loops under the aortal arch, then finally comes back up to the larynx. And that is true for all mammals. In giraffes, the thing can be about 10 meters long.
And the reason it is that way is that evolved from a nerve that used to go from a fish brain to fish gills, and the shortest path was underneath the heart. But as fish evolved, their shape changed, and eventually they acquired a neck, moving the brain to a different place in the body. It’s WAY easier for evolution to just make something longer as opposed to rewiring it, so the RLN just got longer and longer, still looping under the heart.
Reason #4821 why we know evolution is real.
Image source: DrColdReality, tanitost
Just over two hundred years ago, doctors learned to administer anesthesia during surgery, and a couple of decades later, they began actually washing their hands and disinfecting their tools. This revolutionized medicine.
However, the pioneers of these discoveries sometimes faced genuine persecution from “academic science” – like Ignaz Semmelweis, for example, who suggested that obstetricians simply disinfect their hands, thereby saving countless lives of new mothers and newborn babies.
But even in the 20th century, seemingly the most enlightened in terms of science and medicine, incredible things were sometimes quite common. With each passing decade, we learned more and more about our bodies – and often these discoveries completely overturned what had previously been considered absolute axioms.
#10
Oh okay I learned this fun one after some dumb little embryo stupidly implanted in my fallopian tube & kept trying to grow until the tube explode. Next thing ya know, I was in a hospital bed post-op from live saving surgery down an organ, one that I had no intention of parting ways with.
Fearful that I had essentially lost half my reproductive organs, the surgeon gave me an anatomy lesson.
So, typically when an egg is released by the left ovary, the left fallopian tube will snatch it up, same for the right side. I thought, “this is a bummer guess I have like half the opportunity to get pregnant again.” NOPE. My remaining tube can CREEP ACROSS my uterus to snatch up an egg released by the ovary on the opposing side.
Image source: ameliacanlove, freepik
#11
You can actually smell your lungs while breathing but your brain ignores this smell.
Image source: be_a_palm_not_a_tree, benzoix
#12
The nerves for your teeth run quite close to your sinuses.
If you get a sinus infection the swelling can push against the nerves and your brain thinks you have tooth ache. .
Image source: toon_84, freepik
Very soon, in a couple of weeks, the first quarter of the 21st century will end, which many unfairly consider the era of the internet and computer technology. In fact, medical science has made tremendous strides in the last 25 years – in particular, we’ve gradually begun to achieve success in treating complex genetic diseases, as this dedicated article at National Geographic says.
And, beyond generating funny pictures and other meaningless slop that only clutters the internet, artificial intelligence is truly helping us discover new cures and solve health problems by finding new approaches to long-known problems. Every year brings us new knowledge about ourselves. We just need to have the desire to acquire this knowledge.
#13
Your brain knows to ignore your nose. . . SITTING. . . RIGHT. . . THERE, because otherwise it would pretty much drive you nuts.
Image source: Hour-Lab140, wayhomestudio
#14
Restless Leg Syndrome can be a symptom of Anemia. Get your iron checked.
Image source: Simsandtruecrime, fxquadro
#15
There is only one bone in our bodies connected to no other bones. It is called the hyoid bone and it is in your throat. .
Image source: naughtmyrealname, freepik
Well, we’re pretty sure you may know some of the facts listed in this selection, but some of them may be a real revelation for you. And then, in conversation with friends and colleagues, you can show off your new knowledge – after all, why not?
So please feel free to read this list to the very end – and in case you know something about the human body that isn’t included here (after all, any list has its limits), please feel free to share your interesting piece of knowledge in the comments below.
#16
The brain is a very needy drama queen in many ways. It often acts like a selfish tyrant when it feels the need to protect itself… it can and *will* jeopardize nearly every other bodily system to save itself.
For example, fainting is essentially the brains super cool way of saying “I want better blood flow, but i’m not getting it, therefore I will *force* the body to be horizontal”.
When you’re on the floor, gravity acts in favor of better circulation to the brain than standing upright (the heart and brain are then on the same level).
Other examples can include glucose hoarding, blood shunting, and cushing’s reflex, to name a few.
Image source: angelvapez, standret
#17
The human body has more than 60 sphincters.
Image source: tvtoms, katemangostar
#18
The tongue is the only muscle attached at only one end.
Image source: SympatheticFingers, EyeEm
#19
That your stomach gets a brand new lining every 3 to 4 days. That’s your body basically saying to not worry about the acid in your stomach is under control. Stomach acid is strong enough to literally eat through metal if it could, so your stomach needs that constant makeover to keep itself from dissolving. Most people have no clue this is happening every single week.
Image source: tssohal, freepic.diller
#20
If your immune system discovers you have eyes, it will destroy them.
Image source: zeekoes, freepik
#21
I’ll use myself for an example. I have a rare trait called antimetropia, in simple terms that means my eyes have opposite eyesight (one is nearsighted, the other is farsighted). Most people don’t seem to know this is possible. Even when I try to order glasses online… the websites tell me my prescription must be wrong because it’s too unusual.
Image source: Icy-Whale-2253, freepik
#22
The human brain is pink, soft, jiggly and friable.
Source: I perform autopsies.
Image source: Young_Old_Grandma, freepik
#23
People think their eyes are in the upper half of their skull. They are basically in the middle of your skull. Halfway between your chin and the top of your head.
Image source: Ok_Literature3138, freepik
#24
Have you ever wondered why most animals all seem to basically look alike (at least until you become very familiar with some particular pet or something?) Whereas humans seem to be quite distinct.
Human faces, like our overall bodies, generally from one individual to another, are very similar in shape. We are not really different from other animals that way. People just _seem_ very unique because our brains are highly tuned to differentiate faces.
Also attractiveness in faces, aside from symmetry and masculinity/femininity, is mainly just about being the most average looking face possible. Meaning proportions that are most typical.
“Lactose intolerance” affects half of Americans and it’s not a medical condition or flaw in any way. It’s just not typical for human adults in general to be able to consume cow’s milk. The idea that everyone should be able to drink it mainly comes from the dairy industry and maybe a little bit of racism. Cheese and pizza may be worth whatever the consequences are though 😛
It’s also not normal for humans to be able to routinely drink alcohol safely. That idea also comes from the alcohol industry.
Image source: ithkuil, freepik
#25
If you get shot in the ear the cartilage is damaged and will show a divot because it’s unrepairable.
Image source: Defiantfellow, EyeEm
#26
Redheads require up to 20% more anesthesia than non redheads.
Image source: JohnnyWall, hmelevo4ka
#27
Most of your cells aren’t human. .
Image source: TheLeastObeisance, studioworkstock
#28
So there are these little bugs that live on your face. Pretty much everyone has them.. Demodex they are called. a mite that lives in human hair follicles, usually on your face. You can’t wash em off as they bury too deep they eat your oily face sebum and reproduce at night.
Image source: RockPrize6980, TriangleProd
#29
Our body loves fat but hates muscle because fat is like an energy storage for it and muscle is a “useless weight” for our body. Hence why is building muscle so hard. .
Image source: RestaurantJaded7240, freepik
#30
When a woman is pregnant, small bits of the baby’s DNA cross the uterus barrier and stay in her body even after birth. So every child a woman carried has changed her forever.
Humans have stripes, but we usually cannot see them.
On the same subject, a lot of women are chimeras and don’t know about it. They have different DNA in different parts of their bodies. Only a small portion discover it thanks to situations that demand DNA testing.
Image source: LnktheLurker, shurkin_son
#31
Oh I learned this one recently: one of the X chromosomes in a person with two X chromosomes is inactive. So they’re technically only using one X chromosome (aka Barr Body).
Image source: priv_ish
#32
Most people think Celiac Disease (a genetic autoimmune disease where the body destroys villi in the small intestine when gluten is consumed, leading to malnutrition, joint pain, ataxia, growth disturbance, and cancer) is something that affects Western populations, but it’s actually turning out to be just as common (at around 1% of the population) in South East Asian and African populations as well as testing increases, particularly through immigration to countries where testing is common. The rate may also be similar in other populations as well if testing is ramped up there as well.
It’s also not a new phenomena – it was first described in ancient Greece, and the Dutch Famine in WWII is what helped narrow down gluten as the culprit for what triggered Celiac – children dying of malnutrition in hospitals actually improved during the Famine because they were no longer fed bread.
Image source: tiamatfire
#33
Studies have shown that trauma can be inherited through markers on a person’s genome that persist over multiple generations, meaning psychological trauma can be passed down through genetics.
For example, if your grandparent experiences a traumatic event in early childhood (say, a parents death) and lacks the appropriate support system to deal with the loss, the trauma they hold from this event can be passed to their child which in turn can be passed to you.
Image source: anon
#34
All your senses (when stimulated) can wake you up EXCEPT smell! So if your house is burning at night you might wake up when the smoke starts to hurt your nose or throat but not because of the smell. That’s why fire alarms are very important!
Image source: yogimcboobs
