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Alright, here’s the deal: even though humans have made some crazy cool stuff like lab-grown organs and half-robot arms, there are still some body mysteries that totally baffle even the experts. Like, why do we yawn and why is it contagious? Why do babies get colic? Why can’t we explain anesthesia? Lots of head-scratchers right here.

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We asked a bunch of doctors and regular folks - “What don’t we know about the human body?” The answers are wild and sometimes funny, but mostly just proof that our bodies are kind of like the ultimate puzzle that science hasn’t solved yet. Buckle up, let’s dive into these baffling body brain teasers!

#1

Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

ashenputtel , Freepik (not the actual photo) Report

Do women actually feel pain differently? Some doctors seem pretty clueless. It’s one of those ‘we think we know but we don’t’ moments in medicine.

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Why do we have fingerprints anyway? You’d think they help us grip stuff better, right? Nope! It turns out fingerprints actually make less skin touch stuff than smooth fingers would. Some nerds guess they protect our fingers or help us feel textures, but really – your guess is as good as theirs!

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    #2

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Captain_Coco_Koala , Freepik (not the actual photo) Report

    If you’ve ever asked how anesthesia works, prepare for a shrug. One anesthetist straight-up told someone, 'We don’t actually know.' We just know it knocks you out and that’s good enough for now.

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    #3

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Basic-Pair8908 , EyeEm/Freepik (not the actual photo) Report

    Turns out, not everyone has an inner voice chatting away in their head. Weird, right? Some folks just don’t have it at all. Scientists are still scratching their heads over this one.

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    Ever wonder why some people are lefties and others righties? Only about 10% of people rock the left hand, which is weird because evolution hasn’t given us super balanced hands yet. Why do we favor one? No clue.

    #4

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Keelera2 , Freepik (not the actual photo) Report

    Fun fact: medicine never really got around to properly studying the female body until recently. So yeah, there’s a bunch we still don’t know.

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    #5

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    hampie42 , Freepik (not the actual photo) Report

    The immune system sometimes just freaks out. One parent shared how their kid’s immune system went haywire with Guillain-Barré syndrome and no one knows why it acts randomly. You just have to wait and hope.

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    #6

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Ultimatelee , katemangostar/Freepik (not the actual photo) Report

    Doctors can’t yet tell how well or fast your brain will bounce back after an injury. Your brain is delicate and tough at the same time, and apparently that’s hard to figure out.

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    Experts think it might be all about brain wiring. Lefties use the right side more, righties the left. But why? Total mystery.

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    #7

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Routine_Order_7813 , EyeEm/Freepik (not the actual photo) Report

    Autoimmune conditions are super confusing. One patient describes the rollercoaster of symptoms, weird bloodwork that changes randomly, and treatments that sometimes work and sometimes don’t. Plus, it messes with parts of your body you didn’t even know were connected! Talk about a wild ride.

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    #8

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Aquaphile_Sundog , Freepik (not the actual photo) Report

    Believe it or not, placebo meds sometimes actually help people get better. Yeah, just a sugar pill causing real effects. Medicine is wild like that.

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    #9

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Jijster , Freepik (not the actual photo) Report

    ALS is a brutal disease that slowly paralyzes people and sadly always ends in death. What causes it? Nobody knows. It goes by a bunch of names like Lou Gehrig’s disease and Motor Neuron Disease, but the mystery remains.

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    Dreams! Why do we dream? What are they even for? Humans spend a third of their life asleep and science is still scratching its head over this one.

    #10

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    ZestycloseHawk5743 , Freepik (not the actual photo) Report

    Brains fire signals, sure, but how that turns into YOU - your feelings, your sense of self - people have no idea. We get brain scans and all, but the magic that makes consciousness happen? It’s the greatest mystery around.

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    #11

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Thoracic_Snark , prostooleh/Freepik (not the actual photo) Report

    That little pain reliever you grab? Scientists still can’t fully explain how it actually takes the pain away. It’s like a tiny miracle pill.

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    #12

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    rihkuwo , Freepik (not the actual photo) Report

    If you ever wondered why your brain throws a whole movie in your head every night, you’re not alone. Scientists are just as baffled. And what’s up with those weird recurring dream houses that nobody recognizes?

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    Some say dreams help us sort through memories like a mental filing system. Others think it’s just our brain having fun while we snooze. Either way, pretty cool.

    #13

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Prokopton1 , Freepik (not the actual photo) Report

    Your gut bugs aren’t just helping you digest - they might even mess with your mood and brain. Some stomach issues like IBS could be caused by funky gut bacteria, but doctors are still figuring it out.

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    #14

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Quiet-Competition849 , EyeEm/Freepik (not the actual photo) Report

    We know we gotta sleep or else things go wonky, but why exactly we do it? Well, we don’t fully know. The brain just says, 'I’m out!' and science can’t explain much beyond that.

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    #15

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    NeedingVsGetting , Freepik (not the actual photo) Report

    Some cancer treatments cause bone pain, and oddly antihistamines seem to help a lot. Doctors don't really get why though - just a happy accident, maybe!

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    Then there are bizarre medical oddities, like Brooke, a girl who never aged past 5 even though she lived to be 20. Scientists have no idea how that happened!

    #16

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    ConcertinaTerpsichor , Getty Images/Unsplash (not the actual photo) Report

    Migraines are the house guests no one invited but everyone hates. Why they happen? That’s still a big stumper for science.

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    #17

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    efox02 , EyeEm/Freepik (not the actual photo) Report

    Babies crying for hours with no reason? Welcome to colic, the ‘wtf’ of pediatrics. Doctors can’t explain it and all they say is, 'Just don’t shake the baby.' Good luck, parents!

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    #18

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    mamborambo , senivpetro/Freepik (not the actual photo) Report

    An engineer once said doctors don’t always truly understand patients the way engineers understand machines. That’s why medical mysteries exist and why some people just stick to engineering instead!

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    Her DNA looked totally normal and her family was totally regular, so her frozen aging is just one big medical mystery.

    #19

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    wurst_cheese_case , Freepik (not the actual photo) Report

    Pregnancy seems magical, and honestly, science still has more questions than answers about why some things like eclampsia happen. Babies do their own wild thing, no manual included.

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    #20

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Busy-Doughnut6180 , prostooleh/Freepik (not the actual photo) Report

    Mix some mysteries like women’s health and ADHD, add a confused doctor, and you get questions that bounce around with no answers. Fun times!

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    #21

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    lunarcthulhu , The Yuri Arcurs Collection/Freepik (not the actual photo) Report

    Endometriosis is seriously painful and way more than just bad periods. It’s under-researched and nobody really knows why it happens or how to fix it properly. One sufferer even ended up using a cane before surgery.

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    #22

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Killdozer54 , Tim Bi/Unsplash (not the actual photo)sh Report

    No cameras, no sounds, but somehow you know when someone’s watching you. And weirdly, we often guess the direction right. Science hasn’t cracked this psychic feeling yet.

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    #23

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Jekawi , pch.vector/Freepik (not the actual photo) Report

    We know how labor works, but what flips the switch? No one’s 100% sure. One idea is that baby lungs send a ‘go’ signal, but it’s all guesswork.

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    #24

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    KiwiKaos , luis_molinero/Freepik (not the actual photo) Report

    People have been wondering forever why we yawn and why seeing someone else do it makes us yawn too. Spoiler alert: science still doesn’t have a convincing answer!

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    #25

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    ChipsHandon12 , jcomp/Freepik (not the actual photo) Report

    Seriously though, why did carbon decide to get busy and become the backbone of life? This is one of those cosmic mysteries that makes your head spin.

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    #26

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    CoolLordL21 , Bas Peperzak/Unsplash (not the actual photo) Report

    Massage therapists notice those spots that hurt when you press but then sometimes vanish if you keep pressing. No one knows why or what those spots even really are. Magic? Maybe.

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    #27

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Otherwise_Pressure61 , gballgiggsphoto/Freepik (not the actual photo) Report

    Some people shake uncontrollably for no known reason, and all doctors can say is, 'We have no idea why.'

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    #28

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Skillthiz , ohammad hosein safaei/Unsplash (not the actual photo) Report

    This weird reflex where people start sneezing when they step into sunlight is called the photic sneeze reflex. But why it happens? Science is still just googling for answers.

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    #29

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Own-Cauliflower2386 , senivpetro/Freepik (not the actual photo) Report

    Engineers visiting hospitals get super disappointed because bodies don’t work like machines - they don’t follow simple ‘find and fix’ rules. Organs have lifespans, medicines act weird, and symptoms often don’t line up. Bottom line? There’s so much more we don’t know.

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    #30

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Titmonkey1 , Freepik (not the actual photo) Report

    Sleep is essential, but science still hasn’t nailed down why. Darn brain, you secretive little thing.

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    #31

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    fmdoc909 , Getty Images/Unsplash (not the actual photo) Report

    Fibromyalgia causes ongoing tiredness and pain, but what exactly causes it? Scientists are still in the dark.

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    #32

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    thitorusso , Windah Limbai/Unsplash (not the actual photo) Report

    For most folks with epilepsy, doctors still can’t pinpoint the exact cause - even with all our tech. Genetics, injuries, infections - the list goes on, but the ‘why’ often stays a mystery.

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    #33

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    rumpsky , EyeEm/Freepik (not the actual photo) Report

    Teary moments and mood stabilizers like lithium are things our brains do, but science still can’t fully explain them. Crying, mood drugs - it’s all a bit mysterious.

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    #34

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Large_Goose_1708 , prostooleh/Freepik (not the actual photo) Report

    Sometimes, a pregnancy splits early and makes identical twins. But why this happens is a complete mystery that science can't explain yet.

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    #35

    brik70p Report

    We all lose the ability to read small print as we age, but doctors can’t agree on exactly why. The eye’s lens keeps growing, muscles stay strong, but something just changes. No smoking gun yet.

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    #36

    Wagnaard Report

    Neural networks and brain scans are cool, but how the brain creates self-awareness and perception? Scientists haven’t a clue yet. This is the big enigma of existence.

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    #37

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    therobster18 , Freepik (not the actual photo) Report

    Frozen shoulder mostly hits middle-aged folks and diabetics, but why? Doctors still don’t fully get the reason behind this stiff mystery.

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    #38

    Utheran Report

    Our understanding of the brain and how it shapes ‘us’ is embarrassingly limited. The more we learn, the more questions pop up!

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    #39

    K-TPeriod Report

    It’s amazing our complicated bodies work at all. Science is still amazed every day.

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    #40

    casapantalones Report

    Fun fact: even anesthesiology pros say we don’t fully know how many anesthetic drugs work. Oooh, spooky!

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    #41

    Granzilla2025 Report

    How you end up with your grandma’s hair color, dad’s eyes, and mom’s hips among siblings is a never-ending family mystery. Genetics is messy business!

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    #42

    flatstacy Report

    When exactly birth starts? Scientists have guesses but no 100% answers. Nature likes to keep it a secret.

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    #43

    Impressive-Yogurt-19 Report

    Probably not. The human mind keeps throwing curveballs that no one can neatly explain or pin down.

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    #44

    Wait, Doctors Admit They Don’t Actually Know This Stuff About Our Bodies!

    Ms-Janet-Snakehole , EyeEm/Freepik (not the actual photo) Report

    Why boys exist and what their purpose is? Yep, people actually ask that and no one’s got a simple answer.

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