How well do you know your body, this amazing mechanism? Despite the fact that we all have some understanding of anatomy and physiology, the topic is so large and interesting that we can talk about it for hours. 
Here are the most striking comments from Reddit users who participated in the discussion "The Coolest and Little-Known Facts About Our Body." 
- There is enough fat in the human body to make seven bars of soap.
- Only seven? Nonsense, you can make at least fifteen from my body!
- There is enough potassium in our body to create a very small bomb.
- It turns out that after death I can become both a bomb and soap? I urgently need to make changes to my last will and testament. 
- If you drink only Powerade Grape (purple) for three days in a row, your feces will turn a bright neon green color.
- Yes. I found out about this by accident: due to food poisoning, I couldn’t eat anything, and the only drink at home was purple Powerade. 
- The bone that supports the eyeball is paper thin and has a large empty cavity on the opposite side. When you receive a hard blow to the eye, the bone under the eyeball breaks, relieving the pressure from the blow and preserving the eyeball. An amazing example of evolutionary adaptation to protect our vision!
- Yes, guys, but when this bone breaks, it can crush/tear the optic nerve and the person can go blind in that eye. I fell unsuccessfully on the stairs and now one eye cannot see. Be careful. 
- There is a small fishing village in Asia. Its inhabitants, who engage in spearfishing/diving, can hold their breath for about 10 minutes.
- We are talking about the Bajo (Badjao) people - they are called “sea gypsies.” These are the indigenous peoples of the Philippines, Malaysia and Indonesia. 
- Diver's reflex. When you put your face in cool water and hold your breath, it lowers your heart rate and increases blood flow to vital organs such as the heart and brain. This, in turn, helps increase the amount of time you can hold your breath. 
- Do you know the smell of rain or disturbed soil? This is the smell of the compound geosmin produced by bacteria, and the human nose is extremely sensitive to it. We can smell this smell even in extremely low concentrations.
- In terms of the number of cells, we are more bacteria than people.
- The microphobes started crying now. 
- Some people are born with extra ribs that grow from the C7 cervical vertebrae. Cervical ribs are a strange and rare mutation that many people are not even aware of. It causes thoracic outlet syndrome: compression of the blood vessels or nerves between the collarbone and the first rib. This can cause severe pain in the neck, shoulder, arms, numbness in the fingers, and even lead to gangrene.
- Approximately 10% of the population lacks the palmaris longus muscle in the forearm. You can easily check if you have it by putting your little finger and thumb together, keeping your palm facing up, and bend your arm upward. If one tendon protrudes more than the others, it is the palmaris longus muscle. 
- Some people (like me) sneeze every time they have sexual fantasies. That is, it is a sexual sneeze.
- Some people start coughing if they have a foreign object in their ear. This is called the Arnold cough reflex. The cough begins due to irritation of the area innervated by the Arnold nerve (part of the external auditory canal and the back half of the eardrum).
- Damn it! I always told my boyfriend that I hated cleaning my ears because it made me cough, and he thought I was a complete idiot. 
- Your liver can recover, and much faster than you think. They removed a quarter of my liver, and a month later it came back.
- The liver does not regenerate, but hypertrophies. This means that the remaining liver becomes larger and increases its activity to compensate for the part that is removed. But it's still amazing. 
- I observed an amazing case when I was working on my dissertation. We studied patients with neurological problems and people with traumatic brain injuries. One 30-year-old patient had part of her brain removed. More precisely, the area that activates when you move. But the woman moved and talked (with minor flaws), although this was theoretically impossible - she was paralyzed in the first 3 months after the operation (after a car accident, as far as I remember). We were testing a new brain scanner and found that an area of the brain that shouldn't be working and controlling movement was doing just that. The occipital region (usually controlling vision) in this case acted as a motor control area. The neuroplasticity of the brain is simply amazing!
- Cutting into the corpus callosum (which connects the two hemispheres of the brain) can produce strange results. For example, your hand is doing something that your consciousness does not know аbout: writing a sentence or scratching a sore. And you don't even know about it. 
- When we get sunburned, it's not the sun's heat that actually harms us, but the little skin cells that kill themselves to protect us from skin cancer. Not that cool if you think about it.
- Red-haired people require higher doses of anesthesia, which is associated with a mutated melanocortin-1 receptor. I myself am a natural redhead, and I developed a fear of dentists because I always felt what they were doing! I ended up having to find a new dentist. He looked at me and said, “You're a real redhead, aren't you? Then four times more novocaine.” Now I only want to go to him. 
-Women are actually programmed to forget about the pain of labor after a few months or so. If not for this, most women would only have one child, which would ultimately lead to a population decline.
- Babies are born without kneecaps and they develop at about 2 years of age. But they have cartilage that protects their knees.
- A woman can give birth after death. I'm an archaeologist and every now and then we come across a burial where the skeleton of an unborn child is halfway through the mother's pelvis. What usually happens is that the woman died before giving birth, and after burial, the accumulation of gases from decomposition displaces the child. We call it a Coffin Birth, or "posthumous birth."
- Disgusting. But thanks for the idea, Coffin Birth sounds like the name of my next metal band???? 
- We mostly breathe through one nostril, and the “dominant” nostril switches every hour or so.
- Your arms and legs alone make up more than half of all the bones in your body (106/206). 
- When we go to sleep in a new place, in an unfamiliar environment, one hemisphere of the brain is asleep, and the other is awake, like a shark, and therefore we wake up easier. The brain seems to be working on night watch.
- “Superson”. There are people with the rare ability to fully “recharge” after 2-4 hours of sleep. This time is enough for them and there is no lack of sleep or fatigue. Scientists have found that the problem is a mutation in the gene that regulates sleep.
- The optimal human circadian rhythm is actually closer to 25 hours than 24. This has been tested in experiments depriving people of sunlight and other triggers that maintain the circadian rhythm.
- So, we are simply created for life on Mars?
- Apparently so. Nobody knows why. In fact, many aspects of sleep are a scientific mystery.
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