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1. From north to south, the earth is divided into five generations: ( ), ( ), ( ), ( ), ( )

Northern Frigid Zone

The frigid zone of the northern hemisphere, between the Arctic Circle and the North Pole

North Temperate Zone

Latitude: 66 degrees 34 minutes north latitude to 23 degrees 26 minutes north latitude, that is, between the Tropic of Cancer and the Arctic Circle. Includes most of Asia, Europe, and North America.

The seasonal changes here are obvious, the population is large, and it is affected by polar air masses all year round. Although the surface water temperature is low in winter, the salinity is low, the oxygen content is high, the vertical exchange of water masses is strong, the water is rich in nutrients and plankton is abundant, so a large number of fish that feed on plankton are reproduced and grown, making it an important distribution area of ​​the world's fishing grounds. The number of fish species in this zone is far richer than that in the Arctic zone, mainly Pacific cod, herring, salmon, etc. It plays an important role in the world's fishery economy. Among mammals, there are fur seals, sea donkeys, sea otters, Japanese whales and dolphins in the Pacific; there are Biscay whales, white sea dolphins, seals, etc. in the Atlantic waters. The northern temperate zone will become smaller and smaller! Because the greenhouse effect makes the temperate zone larger, the cold zone also becomes larger!

tropical

The zone between the Tropic of Cancer and the Tropic of Capricorn is located on both sides of the equator, in the tropics between 23°26′ north and south latitude, and accounts for 39.8% of the world's total area. On the Tropic of Capricorn, the sun's altitude in this zone is very high all year round. In the vast area between the two Tropics of Capricorn, there is direct sunlight once a year, while in other tropical areas, there are two direct sunlights in a year. Moreover, the sun's altitude at noon here is high all year round, with little variation. Therefore, this zone can receive strong sunlight all year round, and the climate is hot, which is called the tropics. On the equator, the day and night are of equal length all year round. From the equator to the Tropic of Capricorn and the Tropic of Capricorn, the variation in the length of day and night gradually increases. On the Tropic of Capricorn, the longest and shortest daylight differ by 2 hours and 50 minutes. It can be seen that within the tropical range, the latitude difference in astronomical phenomena is extremely small. The characteristics of the tropics are high temperatures throughout the year, with very small variations, and only relatively hot and cool seasons or rainy and dry seasons.

South Temperate Zone

Located approximately between 40° and 60° south latitude, the development and growth conditions of marine life are similar to those in the northern temperate zone. Marine plants flourish, giant algae grow extremely well, and plankton is abundant. It is the area with the most marine animals in the southern hemisphere. There live several animal groups that can be seen in both the southern and northern temperate zones, such as seals, fur seals, whales, as well as knife fish, small mullets, fin fish, sharks, etc. In winter, marine animals from the south overwinter here, and in summer, tropical marine animals come here to fatten. In the southwest of the African continent and the coast of Peru in South America, due to the existence of upwelling, the rich nutrients and organic matter in the deep seawater are brought to the surface of the seawater, causing a large number of plankton to reproduce, so fish are very abundant, making it an important fishing area in the southern hemisphere.

The southern frigid zone is centered on the North and South Poles and bordered by the Arctic Circle, accounting for only 8.2% of the world's total area. The sun's altitude in this zone is very low all year round, with a maximum altitude of 46°52′ on the Arctic Circle and only 23°26′ at the poles, and negative values ​​appear. The polar day and polar night phenomena become more significant with increasing latitude. During the polar day, the sun's altitude is very low, so the ground receives very little heat. During the polar night, there is no solar radiation on the ground. Therefore, this zone is the lowest temperature on the earth's surface. There are only winter and summer in a year, but no spring and autumn. On the earth's surface, the spatial distribution of tropical, temperate, and frigid zones indicates the uneven distribution of heat. The tropics are the largest heat source on the earth's surface, and the poles are the largest cold sources. Therefore, the heat transfer and exchange between the equator and the polar regions are of decisive significance to the formation and distribution of global atmospheric circulation and ocean currents. The vast temperate zone is the zone where cold and warm air currents come into contact and exchange heat, forming the weather characteristics of four distinct seasons.

2. What causes enlarged pores?

Do you not have the luxury to take care of your skin? Generally, our skin metabolism is once every 72 hours, and the metabolites will be continuously pushed from the dermis to our stratum corneum and then discharged from our skin. However, due to the lack of regular cleaning of the skin, the metabolites will accumulate in our stratum corneum (the skin we can touch). Because of the excessive secretion of sebum, the pores are blocked and dead skin is formed, which is what we call blackheads and acne, resulting in enlarged pores....

3. What foods can enhance immunity?

You can eat more fruits and vegetables such as spinach, apples, bananas, tomatoes; meats such as cod and beef; grains such as mung beans, brown rice, red beans; eggs, cheese, etc. These foods are rich in vitamins that stimulate the immune system and increase immunity, such as natural carotene, vitamins A, C, E, B6, B12, iron, zinc, selenium, folic acid, etc.

4. How can you become smarter?

First of all, it is diet. Eat more beneficial foods, such as seafood (especially fish roe), soy milk, nuts, vegetables, onions and other foods rich in DHA and vitamin lecithin. Do not eat foods containing aluminum such as fried dough sticks, jellyfish, vermicelli, preserved eggs, etc., and avoid using aluminum pots when cooking.
Secondly, your brain will rust if it is not used. As the saying goes, a rolling stone gathers no moss. Your brain will become more flexible if you use it often.
The IQ of the third party is actually similar. The key lies in the degree of one's own efforts. Self-confidence is very important. Don't give yourself the negative psychological suggestion that you are not smart.


Theory on the smartness of eating fish Fish is rich in protein, which can help children grow and develop. It can also help recovery and healing when they are sick or have wounds. The EPA and DHA in fish can lower blood lipids and prevent the threat of heart disease. However, when feeding fish to children, be careful to remove the fish bones to prevent them from getting stuck in the throat.

I often see older people saying to children: "Be good! Eat more fish, it will make you smarter!" In fact, this is true. Eating fish not only makes people smarter, but also protects the heart and blood vessels, and even makes people happier and less depressed. How can it be so magical?

Fish is rich in nutritional value

The protein content of fish is about 15-24%, so fish is a good source of protein, and the absorption rate of these proteins is very high, about 87-98% will be absorbed by the human body. The fat content of fish is much lower than that of livestock meat, and fish contains very special ω-3 fatty acids, such as EPA (Ecosapenoic acid, eicosapentaenoic acid) and DHA (Decosahexanoid acid, docosahexaenoic acid).

In addition, fish oil is rich in vitamins A and D, especially in fish liver. Fish also contains water-soluble vitamins B6, B12, niacin and biotin. Fish also contains minerals. The most noteworthy ones are anchovies or sardines, which are a good source of calcium if eaten with bones. Marine fish are rich in iodine. Other minerals such as phosphorus, copper, magnesium, potassium, iron, etc. can also be taken in when eating fish.

DHA is a key element in boosting brain power

Why do we often hear that eating fish can make you smarter? There is actually a scientific basis for this. The DHA contained in fish is mainly found in the brain, retina and nerves in the human body. DHA can maintain the normal function of the retina. Infants especially need this nutrient to promote healthy vision development. DHA is also of great benefit to the development of the human brain and intelligence, and is an indispensable nutrient for the growth of the nervous system.

Most seafood contains DHA, but deep-sea fish such as salmon, mackerel, sardines, saury, and bluefin bream are rich in DHA, especially in the fat tissue near the fish's eyeballs. Although cod, milkfish, and mullet have high oil content, their ω-3 fatty acid content is not very high; tuna, yellow croaker, sea bass, and hairtail have even lower ω-3 fatty acid content.

DHA is very important for the rapid brain development of fetuses and infants. Infants cannot produce enough DHA for brain cell and nerve development. They must obtain DHA from breast milk or infant formula. Breast milk is rich in DHA. Babies fed with breast milk have better visual development and intellectual cognitive development than babies fed with infant formula. The longer the baby is breastfed, the higher the IQ of the baby will be, and the better the academic performance will be when they grow up. Therefore, breast milk is the best food for babies.



Professor Mike Croft, a British scientist who has been engaged in brain nutrition chemistry research for a long time, declared at the 1990 Tokyo International DHA Symposium: "Children who eat fish regularly have higher IQs than those who mainly eat meat" because "DHA contained in fish is good for the brain." This conclusion immediately attracted widespread attention from the world.
What is DHA? DHA is an organic compound composed of 22 carbon atoms, 2 oxygen atoms and many hydrogen atoms. Its full name is "docosahexaenoic acid". It is a highly unsaturated fatty acid. DHA is the abbreviation of its original English name. Studies have shown that highly unsaturated fatty acids can reduce the cholesterol concentration in the blood and prevent cardiovascular diseases caused by arteriosclerosis. They also make the blood less likely to coagulate and reduce inflammation. As a highly unsaturated fatty acid, DHA has the magical effect of promoting brain development, enhancing memory and preventing brain aging, so it is known as "brain gold".
In-depth research has also found that DHA only exists in fish and shellfish, and is not found in pigs, cattle, sheep, or other plants. In other words, DHA can only be obtained by eating fish. About 10% of the fat in the human brain is DHA, and all of this DHA comes directly or indirectly from fish. Based on the experimental results, Professor Croft further speculated: "DHA has played a big role in the history of human evolution. Humans eat fish and take in DHA, which enhances brain function and promotes human evolution."
Do ordinary fish contain DHA? Yes. But the DHA content in different fish or the same fish in different seasons will be different. Because DHA is mainly concentrated in fish oil, those fish with higher fish oil content such as eel, hairtail, sardine, anchovy, herring, anchovy, etc. contain more DHA; fish in the growth or breeding period also have much more DHA content than usual. In addition, shellfish such as oysters, octopus, and cuttlefish also contain a certain amount of DHA.
Starting today, please eat more fish. No matter how you cook it, the DHA in fish will not be lost or destroyed. The important thing is to put cooked fish on the table every day. If you are a parent, you should do this even more to provide a sufficient material foundation for your child's smart and flexible mind.



However, if the mother does not supplement enough DHA-rich foods during pregnancy or breastfeeding, the body will not contain enough DHA, and the DHA concentration in the infant may be insufficient. Therefore, pregnant and breastfeeding women should consume more deep-sea fish to increase the amount of DHA in the body during pregnancy, or pass it to the baby through breastfeeding. If it is inconvenient or you don’t like to eat fish, you may have to consider taking capsule-shaped DHA supplements. When the mother is unable to or stops breastfeeding, it is advisable to add DHA to the infant’s diet, such as choosing formula milk powder with added DHA, or using more fish to make supplementary food. However, some infant formula milk powders do not contain DHA, so you should pay attention to the label when purchasing.

People with Alzheimer's disease have an average of 30 to 40 percent less DHA in their blood than normal people. People who eat fish regularly are less likely to have their brains deteriorate, and their symptoms of Alzheimer's disease can even be improved. Even for healthy people, a lack of DHA can cause reduced memory and learning abilities.

Medical evidence shows that eating fish regularly has many benefits

Fish is rich in protein, which can help infants, children and teenagers grow and develop, and can also help recovery and healing when they are sick or have wounds. In addition, fish protein has shorter muscle fiber structure and less connective tissue, so fish tastes more delicate and tender than other animal meats, and is easier to digest, making it very suitable for infants and the elderly. Fish contains less fat than animal meat, so the calories are lower than animal meat.

Medical research has found that the Eskimos have a very low rate of cardiovascular disease. It turns out that this is because they have a lot of marine fish rich in EPA and DHA in their diet. A survey in Japan also found that residents of coastal fishing villages have a lower rate of cardiovascular disease than farmers inland. The two special ω-3 fatty acids EPA and DHA in fish can lower blood lipids, especially triglycerides and low-density lipoprotein cholesterol (bad cholesterol), and make platelets less likely to aggregate, thereby preventing cardiovascular diseases and strokes caused by thrombosis, and protecting the heart.

A study in Finland found that people who eat fish less than once a week have a higher rate of mild depression than those who eat fish regularly, because EPA and DHA in fish can eliminate anxiety and prevent schizophrenia. In short, eating fish can make people healthier and smarter.





Eating fish heads is smart and has a basis in fact

Professor Wang Cunxin, a fish research expert at the Chinese Academy of Sciences, said that the nutrition contained in fish brains is the most comprehensive and richest. It contains a kind of fish oil needed by the human body, and fish oil is rich in highly unsaturated fatty acids. Its main component is what we call "brain gold". This is a nutrient necessary for humans, mainly found in the phospholipids of the brain, which can maintain, enhance and improve brain function. If the intake is insufficient, the baby's brain development process will be hindered. Therefore, it is said that eating more fish heads can make people smarter. The meat under the fish gills is transparent and gelatinous, rich in collagen, which can fight human aging and repair body cell tissues; it contains sufficient water, so it tastes good.

He reminded everyone not to eat fish heads from areas with serious environmental pollution; not to eat fish heads with deformed fish with large heads, thin bodies and small tails; not to eat fish heads with cloudy and bulging eyes; not to eat fish heads from spoiled fish or fish heads that have been dead for too long. If you find that the fish head smells of kerosene, gunpowder, almonds, or other abnormal odors such as ammonia or pesticides when cooking or eating, you must discard it. In addition, it must be cooked thoroughly before eating to ensure health.