The foot bone's connected to the leg bone.... The leg bone's connected to the knee bone... The knee bone's connected to the thigh bone...

People on Reddit were asked: "What's the most amazing thing the human body does that people have no idea about?" These are some of the best answers.

1/23 You can lose up to 75% of your liver and it can grow back to its full size, kind of like how a lizard can re-grow its tail but we do it with an extremely complex organ.


2/23 When you blush, the lining of your stomach blushes too.


3/33 I'm sure a lot of people already know this but I'm still amazed about how the nervous system basically controls almost everything in the body. The way electrical signals becoming chemical signals within a fraction of a second is still messing with my mind right now. As I type this thousand of tiny muscle fibers in my fingers are contacting just too much for me right now.


4/23 Everybody else is blown away by the capacity of the brain, while I'm amazed at how the forearm can twist. You have two parallel bones, and your muscles pull them so they cross, which rotates your arm. How crazy is that?


5/23 We can outrun most animals in long distances due to our ability to cool, our efficient 2-legged running, etc. Over short distances, we're boned.


6/23 Breastmilk actually changes it's composition to meet the individual nutritional needs of the baby(ies) feeding from the breast. For example, if mom is nursing a toddler (who is more prone to short little "drive by" nursings) the child get more bang for their buck and gets a full session's worth of proteins, fats and vitamins in their one minute fly by the same as a 3 month old gets in their 25 minute session. As they get older, the quantity of vitamins, fats and proteins changes as well to meet their individual needs. This is even true if mom is tandem nursing two babies of different ages: the milk actually customizes itself to ensure they both get exactly what they need, and the amount of milk she makes is dependent entirely on how much stimulation she gets (i.e. the more the baby nurses at the breast, the better supplied they are. This is why using bottles and pacifiers mucks up someone's supply: the baby wastes all their suckling needs somewhere else).

Even cooler, the milk makes antibodies for the viruses mom and baby are exposed to and fighting off. I always thought the coolest part in particular was that before the mom even know she or her baby are sick, her milk is already creating medicine (antibodies) to treat her child. It's like a built-in vaccine that is constantly being updated to fight off the latest bugs. This is the main reason why breastfed babies are better equipped to fight off both short term illness and long term disease (like respiratory illness, asthma, allergies, etc).

And it comes in a real pretty container, too.


7/23 When a pregnant woman receives heart tissue damage, the fetus will send stem cells to repair it.


8/23 Humans are bioluminescent and glow in the dark, but the light that we emit is 1,000 times weaker than our human eyes are able to pick up.


9/23 Look at an object on the wall across the room. Now keep looking at it while you move your head back and forth, up and down. Your eyes stay pointed at that spot. Not hard to do, is it?

For that to happen, you brain needs to calculate the direction and rate of change your head is moving in 3 dimensional space and then send corresponding signals to the muscles in your eyes to exactly counter match the rotation and speed in order to keep them pointed at that spot. And not only that, the muscles that have to be moved (and the rate at which they move) are different for each eye, since if you turn your head quickly right, you R eye contracts the muscles on the nose side to compensate, and the L eye contracts the muscles on the temple side.

It's an absolutely amazing, fine-tuned process involving incredible spacial calculations and microsecond signaling and adjusting that we do all the time and take completely for granted.


10/23 Ever seen a picture of a person getting brain surgery and been grossed out? That's your brain being grossed out at itself.


11/23 Mitochondria have different DNA which likely stems from the fact that they were once bacteria internalized by another single cell organism (probably archaea) very early on in the evolutionary process creating the single most important symbiotic relationship. Mitochondria are responsible for all of the energy production in your body.


12/23 Basically if you move your eyes too quickly, your brain will freeze details that should be blurred and process that image, preventing you from actually seeing motion blur. I think you would most likely get sick if you could actually see things blur that much?

Anyway, a cool result of this would be the "stopped clock". If you dart your eyes around really fast and then stare at a clock with a second hand, you'll see one second last longer than it should. This is due to saccadic masking blocking any visual processing.


13/23 We have computers the size of rooms, that can undergo quadrillions of operations per second. Our brains still win.


14/23 My dentist told me once that gums heal super quickly. That when you have a cut or something in your mouth it heals faster than a cut on the skin.


15/23 The human hand is one of the most insanely fine tuned pieces of organic machinery on the planet. It contains an absurdly dense amount of nerve cells and special nerve adjustments that make it incredibly sensitive to extremely small signals. Because of this, and the insane art that is the natural craftsmanship of our hands, the human hand has a dexterity for precision that other apes do not have, let alone the rest of the barbaric in comparison animals.


16/23 Your fingers pruning in water? That's not absorption, that's your body shifting to better grab things underwater. If that's not a superpower, I dunno what is.


17/23 When you lose weight, most of the fat you've lost doesn't pass through stool or just "burn off". About 84% of that weight lost is exhaled as carbon dioxide.


18/23 The Fallopian tubes are not attached to the ovaries like the classical drawing you were shown in school. This would be a better picture, but sometimes the tube is even more loosely placed. Yes, your ovary releases the egg directly into the abdominal cavity.


19/23 I think the tonsils go under-appreciated. Most times they do an awesome job of keeping harmful bacteria from finding its way into your airways and making you sick.


20/23 When you shout, your brain kind of turns down your hearing so you don't deafen yourself.


21/23 I've always been amazed by how our brain pieces together information, and fills in gaps.

For example, have you ever looked at the clock and thought the second took a weirdly long time to change? It turns out your brain retroactively changes your memory for the period of time where your eyes are moving to whatever you see when your eyes stop. That is the coolest.


22/23 While a woman is pregnant the fetus can divert stem cells for uses such as repairing the heart after a heart-attack and protecting against breast cancer.


23/23 Knitting broken bones back together is neat, but it gets super cool when the body "shaves" the lump of knit bone down to match the contour and shape of the original.



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