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100000 whys: why do you sometimes sleep more and more sleepy
I always feel that sleeping can alleviate people's fatigue, but some people sleep more and more sleepy. What's the reason?
In fact, there are great individual differences in people's needs for sleep. Generally speaking, people aged 10 ~ 18 need 8 hours of sleep every day; People aged 18 ~ 50 need 7 hours of sleep every day; People aged 50-70 only need to sleep for 5-6 hours a day.
Sleep is important to health, but the more you sleep, the better. On the contrary, too much sleep may make people depressed. Because it can change the normal cycle of sleep and awakening, lead to the disorder of the body's biological clock, and keep the brain in a state of inhibition for a long time. If the cell group in charge of sleep in the brain is tired, it will feel dizzy and uncomfortable after waking up. Especially in hot summer, when the human body is relatively lack of oxygen, the oxygen carrying capacity of the blood will be weakened, which is more likely to lead to drowsiness. So you'll feel sleepier and sleepier.
If you want to avoid this situation, the easiest way is to work and rest on time and live regularly.
Why can't even light escape from a black hole
Time and space are the stage of various physical phenomena. However, this stage is not incomparably hard. The big guys in the universe may trample on this stage.
In order to show the elasticity of the space-time stage, we can imagine the space section in space-time as a rubber film. All kinds of objects in the universe, such as the earth and the moon, are dancers stepping on a rubber film. After the earth came on stage, he stepped on the rubber film and sank it. Therefore, the moon next to the earth needs to rotate around the earth and use centrifugal force to ensure that it does not fall to the ground. At the same time, in order to launch a spacecraft from the earth, the spacecraft also has to spend a lot of effort to climb out of this depressed area in order to swim freely in space.
But the earth is really a lightweight player in the universe. Imagine a guy as big as the earth, but the density is 800 million times that of the earth. As soon as such actors come on stage, they will step through a hole in the rubber film stage and fall into the hole with a plop. We call this hole a black hole.
Standing on the earth far away from the black hole, we will find that the black hole steps on the rubber film so curved that no matter how fast the spacecraft is launched, it cannot escape from the edge of the black hole. Even the fastest light in the universe cannot escape from a black hole. Since light cannot escape, black holes look as if they are black. This is the origin of the name of black hole.
Readers may wonder, since the black hole has trampled on the rubber film of space-time, what does the broken area look like? Is there a "black hole" in space-time? No one can look into the black hole and come out to tell us the answer to this question. However, according to theoretical speculation, there is space-time in black holes. Nature automatically patched the broken rubber film. However, I don't know whether nature is careless or intentional. She "wrong" the direction of this patch, so that the time direction inside the black hole is our space direction (along the radius of the black hole), and the space direction from the center of the black hole to the surface in our eyes becomes the time direction inside the black hole.
Because the time and space inside the black hole have changed their positions, the center of the black hole we outsiders think is actually the future in the patch space-time inside the black hole. Therefore, all objects in the black hole, no matter how they think of "running out", will inevitably fall into the center of the black hole, because this is their future. In this way, a large amount of matter accumulates in the center of the black hole, and the density exceeds the density that can be described by known physical laws. What happens at the center of this black hole is still a mystery to us.
Why does the finger desquamate?
Many people may have experienced the problem of hand peeling. There are many reasons for hand peeling:
1. It belongs to seasonal peeling, which usually occurs from spring to summer.
2. The hand sanitizer or soap used has expired, and the expired liquid reacts to the skin, resulting in a large amount of peeling.
3. Lack of vitamins, because everyone needs all kinds of vitamins in their body. Usually eat more vegetables and fruits.
4. Sweating and herpes have something to do with sweating. Of course, sweating may also be the cause of physical deficiency. Pay more attention to living habits and don't stay up late.
5. Excessive mental pressure, usually listen to more music, exercise more, maintain a good mood, avoid tension and anxiety, etc.
How does desquamate do?
Wash your hands with salt water, once in the morning and once in the evening, remove bacteria, or wash your hands with ginger soup. Or wash your hands with pure rice vinegar. You can also use some antibacterial ointment to wipe. In addition, wear rubber gloves when washing clothes or dishes to avoid direct contact with hands.