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Ten common phenomena that cannot be explained

Human beings are full of curiosity and often ask questions about the world around them. This article lists the reasons for ten daily phenomena that you may not be able to explain. If you already understand, you are much cooler than us. You can use this knowledge to impress your friends, family and romantic partners, because there is nothing more attractive to the opposite sex than understanding these random events.

1. Why do you feel falling when you sleep?

Have you ever been awakened from sleep by a sense of falling or a strong muscle twitch? This phenomenon is known as myoclonic twitch before sleep, or "sleep twitch.". The study found that about 70 percent of people have had such an experience. It's not clear why this happens, but most scientists agree with the following explanation. When falling asleep, people's muscles will be very relaxed, into a temporary state of weakness. When the body sends this message to the brain, it misunderstands this sudden muscle relaxation and thinks you are falling. Instinctive response takes effect, sending a signal to the muscle, suddenly pulling people up, leading to a sudden wake-up. Studies have found that sleep twitch is more likely to appear in sleep anxiety, fatigue and untimely, because the brain is more likely to be confused at this time. Anyway, it's a normal part of the sleep process and there's no danger.

2. Why can the knuckle crack?

You may not make your knuckles ring, but you must have seen others do it. This kind of sound will be made when the air bag or gas between the finger joints is squeezed out. A substance called synovial fluid lubricates the joints. It contains nitrogen, oxygen and carbon dioxide. When the joint is dislocated, the gas will be released quickly and make a cheering sound. The knuckles rarely ring twice because it takes time to recover the gas. It is said that knuckle movement can cause arthritis, but studies have shown that it only causes slight damage to the soft tissue of the joint. Similar sounds occur in the knees and ankles, but not because the gas is being squeezed out. When the joint moves, the tendon will be ectopic, and when it returns to its original position, it will make a cheering sound. It doesn't need to recover the gas like a knuckle, so the sound can be repeated.

3. How does goose bumps come into being?

Goose bumps are small spots that appear on the skin when a person is cold, scared or emotional. The reflex condition for goose bumps is that the hair is erect, which can also be seen in other mammals. The muscles at the bottom of the hair make the hair stand up and goose bumps appear. This reflex is associated with the nervous system, which is responsible for many stress responses. It's not clear whether goose bumps are good for humans, but the reflex makes sense for other animals. When people feel cold, hair erection makes their hair erect, but people usually don't have any body hair. For animals with fur, air sacs are formed between the hairs to form an extra layer of insulation. In response to fear or anger, raising the hair can make the animal look bigger and more threatening. The most typical example is the porcupine, whose spines stand up when threatened. It seems that hair erection is just a reaction left by evolution, constantly reminding people that human beings are not always what they are.

4. Why do fingertips wrinkle?

If you stay in a warm bath for a long time, you are likely to have wrinkles on your fingertips. It will disappear soon after the skin becomes dry, but what causes it to appear? The human body has three layers of skin, subcutaneous tissue (fat, nerves, main blood vessels), dermis (capillaries, nerves, hair roots, sweat glands), and epidermis (protecting skin and keeping water), which are closely connected. Biologists have found that when the skin is soaked for a long time, the epidermis begins to absorb water. Because it is closely connected with the dermis, the distortion of the skin leads to wrinkle. This is common at the tips of the fingers and toes, where calluses absorb water more easily.

Why do people have eyebrows?

Many people regard eyebrows as features of facial recognition. People spend a lot of time on eyebrows: plucking eyebrows, waxing hair, trimming eyebrows, beautifying eyebrows, shaving eyebrows (brotherhood), and drawing eyebrows. They are basically worried about their appearance. But have you ever thought about why they appear in such an important part of the human body? A lot of human hair has disappeared with evolution. Why do you still have these two hairs on your eyes? Eyelashes and lids can block dust and other debris, but they are not always effective. Eyebrows can divert sweat and rain around the eyes, making it easier to see clearly. If you've ever had salt water in your eyes, you know how annoying it is, and natural selection creates eyebrows.

6. Why do you shed tears when you cut onions?

No matter how manly you look, you're always in tears when you cut onions. When the onion is cut, it will release the tear gas factor synthetase into the air. This enzyme will transform the sulfoxide amino acids in the onion into an unstable compound, hyposulfonic acid, which will be rearranged into a substance of thiopropionaldehyde-s-oxide. The substance is a chemical irritant that causes the lacrimal glands to secrete tears when exposed. You may not believe it if you don't cut the onion yourself. You will believe it if you cut it all. There are three ways to prevent this: cut onions at the edge of running water, leave them in the fridge for half an hour, or don't cut to the root. If you're still crying and have money to spend, you can buy a very useful onion glasses for $19.95, black, white and pink!

7. Why freckles?

Freckles are small spots of light brown, brown or black that appear after the skin is exposed to sunlight. These spots are caused by abnormal accumulation of melanin produced by melanocytes. Melanocytes produce freckles to protect the skin from the sun, so they are more likely to appear in people with thinner skin that is prone to sunburn. Freckles are common on the face, arms and shoulders because they are more easily exposed to the sun. For many people, freckles fade in winter and appear in spring and summer. In some cases, excessive exposure can lead to canceration of some cells, so any suspicious looking freckles need to be examined by a dermatologist. The best way to prevent skin cancer is to wear clothes or sunscreen when exposed to the sun.

8. Is sunscreen really useful?

Many people believe that sunscreen can protect people from sunburn, but how does it protect skin from ultraviolet rays? The reason why sunscreen works is that it uses a variety of active ingredients to protect the skin. Most sunscreens use inorganic ingredients to reflect ultraviolet radiation, such as titanium oxide and zinc oxide, and use organic ingredients to convert residual ultraviolet radiation into heat, such as octyl methoxycinnamate and hydroxybenzophenone. The end result can protect the body from ultraviolet radiation by giving it a variety of sunscreen lotion.

9. Why is there a lingering melody?

Almost everyone has experienced such an experience, at a certain time, a song constantly lingers in the mind, and the annoying melody lasts for several hours before it disappears. Whether it's a backstreet boy, a simple drumbeat, or "little world," endless repetition can drive people crazy. So what makes these songs linger in our minds? Scientists believe that the culprit is a kind of "ear bug", which can make people have "non autonomous music imagination", and make the brain full of the melody of a song. These songs touch the auditory cortex of the brain, and studies have found that when you imagine yourself listening to a song, the part of the auditory cortex that is touched when you actually listen to that song is also activated. In other words, imagining a song can lead to involuntary music imagination, but it can only make things worse. Generally, songs will gradually disappear by themselves, but if you can't wait that long, you can listen to other songs or distract your attention to make the music disappear from your heart.

10. Why do you burp?

Burping is caused by diaphragm convulsion caused by involuntary pulsation of diaphragm nerve. This contraction causes air to be drawn in quickly, which is called belching. There are many causes of hiccups, such as eating too fast or drinking too fast, eating too hot or too cold food, or shortness of breath caused by accident, laughing, coughing or sneezing. Sometimes there's no definite reason for burping, which is very annoying. So how to treat hiccups? I've heard a lot of treatments, including drinking water on your head, holding your breath, eating peanut butter, distracting yourself, or looking for something to scare you. Some sound very unreliable, but they can distract you or make you hold your breath, relax the diaphragm and stop twitching. If none of the above methods works and burps, it's necessary to see a doctor. The longest record holder of hiccups in history was a man named Charles Osborne, who lasted 68 years. He belched about 430 million times in his life, 20-40 times a minute on average. The next time you complain about hiccups, think it's going to stop before breaking his record.
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