In our previous life, countless problems have been bothering us, but with the rapid development of human science, the problems around us are gradually decreasing. But because of my shallow knowledge, there are still many problems around me that bother me. For example, why does the fish's tail always stand upright? How do earthworms distinguish between day and night? Why do cats always lick their hair? Why can fish react so quickly to their surroundings? How do fish sleep? ..... These seemingly simple questions make me usually talkative and I don't know how to answer them at the moment. In order to solve these problems, I look up information on the Internet.
I soon found the answers to these questions: Earthworms generally live in the moist and loose soil at the depth of 10-30 cm underground; Mainly eat humus containing impurities such as organic matter. There are many photosensitive cells in its skin. Although they have no eyes, they can feel extremely weak light and are more sensitive than people. Moreover, its tactile tube is very developed and sensitive to ground vibration and noise.
Cats like to lick their fur often. Usually, everyone thinks that my cat is really clean and can comb its own hair. In fact, licking your hair is a way to relieve your mood. In addition, cat fur is rich in cholesterol and ergot, which can be converted into vitamin D after being irradiated by ultraviolet rays in the sun and accumulated in fur. Cats have thick skin and can't absorb vitamin D like other animals' skin. Therefore, it has to lick its fur with its tongue to get the vitamin D needed to maintain its physiological activities.
Fish live in water almost all their lives. They either swim left or right in the water, so it is very practical to have a strong and vertical tail. It can help fish change direction freely in the water.
The lateral line of the fish can sense the subtle change of water pressure, so it will know the surrounding situation from a long distance. Generally, a large vibration will make the fish have an avoidance reaction and quickly hide in aquatic plants or gaps. Most fish have color-changing function, and their body color is darker in the dark, lighter in the light and lighter when chased by natural enemies. Some special fish have different ways to escape. For example, loach will crawl into the river bed, while flying fish in the sea will choose to jump out of the water and slide to avoid the enemy's harm. Some primitive fish in Amazon will use weak current to detect the surrounding situation and then respond.
Fish also sleep. Because fish have no eyelids, they can't close their eyes. It looks as if it never sleeps. When most fish sleep, they just stay quietly in the water. Many fish (such as perch) sleep on or under logs at night. Corals are active during the day and rest in cracks in rocks at night. Fish look very different at rest from other times. For example, many small fishes of CYPRINIDAE are active during the day and disperse at night, so shallow water is not advised. Some fish rest during the day and move at night; But almost all fish have to sleep. Some animals have been swimming because they have to keep spitting out water to keep breathing; But they may still sleep during exercise, but we just don't know.
The state of being at rest. Just like when people sleep, fish rest their bodies in this way.
After reading these contents, a big question mark in my heart was finally solved. I have gained a lot of new knowledge by consulting materials, which makes me understand the importance of science to human construction and development, and also makes me understand that I should study science more seriously and make contributions to the cause of science when I grow up.
2. Little scientific knowledge in life (composition)
Life tips 1, nosebleeds, please pat your forehead gently with cold water for immediate effect.
You can only eat four eggs a week. Eating too much is bad for your health.
3, chicken * * * contains carcinogens, it is best not to eat. Eating fruit after meals is a wrong concept, and it should be eating fruit before meals.
5, when women come to menstruation, don't drink green tea, anyway, don't drink tea, eat more things that can replenish blood. 6. Don't add eggs and sugar to drink soybean milk, and don't drink too much.
7, don't eat tomatoes on an empty stomach, it is best to eat after meals. 8. When you wake up in the morning, drink a glass of water first to prevent stones.
9. Don't eat three hours before going to bed, you will get fat. 10, drink less milk tea
Because it is high in calories and oil, it has no nutritional value. Long-term drinking is prone to diseases such as hypertension and diabetes.
1 1, freshly baked bread is not suitable for immediate consumption. 12, away from the charging stand.
The human body should be away from more than 30 cm, and should not be placed beside the bed. 13, drink eight glasses of water every day.
14, drink more water, and bladder cancer will not come. 15, drink more water during the day and drink less water at night.
16, don't drink more than two cups of coffee every day. Drinking too much can easily lead to insomnia and stomachache. 17, eat less greasy food, because digestion takes 5-7 hours, and the blood in the brain is concentrated in the stomach, which makes you sleepy.
18, eat less big meals after five o'clock in the afternoon, because the body doesn't need so much energy after five o'clock. 19, 10 Food types that will make you happy: deep-sea fish, bananas, grapefruit, whole wheat bread, spinach, garlic, pumpkin, low-fat milk, chicken and cherries.
20, lack of sleep will become stupid, be sure to sleep eight hours a day, and you will not get old if you have a nap habit. 2 1, the best sleep time is 10 at night to 6 am.
22. Don't drink more than one glass a day, because alcohol will inhibit antibody-producing B cells and increase the chance of bacterial infection. 23, taking capsules should be swallowed in cold water (you can eat first), take the medicine 30 minutes before going to bed, and avoid lying down immediately after taking the medicine.
24, sour plum has anti-aging effect. 25, hair loss factors: staying up late, stress, alcohol and tobacco, spicy, greasy food, etc.
26, help hair growth: eat more cabbage, eggs, beans; Eat less sweets (especially fructose). 27, a glass of lemon juice and orange juice every day, not only can whiten but also fade dark spots.
28. Apple will always be a good medicine for motorcyclists, addicts and housewives. Eating only one apple a day can give you a clean lung. 29. Smoking and taking vitamins (a vitamin B carotene -A) can lead to cancer. Quitting smoking as soon as possible is the healthiest way.
30. Women should not drink tea in five periods: menstrual period, pregnancy, pre-labor, post-labor and menopause. Smoking is related to lung cancer, lip cancer, tongue cancer, laryngeal cancer, esophageal cancer and bladder cancer.
32. Drinking alcohol leads to cirrhosis and liver cancer. 33, eat areca can lead to oral fibrosis, easy to get oral cancer.
34, food is too fine, lack of fiber, contains a lot of fat, especially cholesterol can cause intestinal cancer. 35. When the food is too rough and the nutrition is insufficient, it will lead to esophageal cancer and gastric cancer.
36. Aflatoxin and nitrite in food are carcinogenic. 37. Don't smoke and refuse to smoke secondhand smoke.
38. Drink moderately, don't spell wine, and don't get drunk. 39. Reduce the intake of salted, smoked and grilled foods.
40. Eat fresh vegetables and fruits every day. 4 1. Eat grains and beans rich in fiber every day.
42. Eat a balanced diet every day, but don't overdo it. 43. Maintain an ideal weight, but not fat.
44. Keep a regular life and exercise. 45. Keep a relaxed and happy mood.
46. Correct eating habits: Eat like an emperor in the morning, like a civilian at noon, and like a beggar at night. Learn five ways to clean carpet stains. 1.
Brush with a brush dipped in concentrated salt solution for several times; Cotton yarn can also be used to remove high-purity gasoline. 2. Fruit juice traces.
You can soak the stain with 80% ammonia solution, and then brush it off with a brush dipped in ammonia solution. 3. Ink.
You can sprinkle some fine salt powder in the dirty place and then brush it off with wet soapy water; Old ink stains should be soaked in fresh milk, and then washed repeatedly with a brush dipped in fresh milk. 4. Fruit wine and beer.
Wipe with cotton yarn or soft cloth dipped in warm washing powder solution, and then clean with warm water and a small amount of edible vinegar solution. 5. Oil stains on animals and plants.
Soak cotton yarn in high-purity gasoline and wipe it repeatedly; You can also use detergent to brush. Three ways to clean the range hood quickly The range hood is a good helper in the modern family kitchen, but how to clean the range hood often makes the family nervous. Here are three simple cleaning methods: 1. Pressure cooker steam washing method.
Boil the cold water in the pressure cooker. When the steam is continuously discharged, take the low-pressure valve, turn on the range hood, and aim the steam water column at the rotating blades. As high-temperature steam continuously rushes into the fan blades and other parts, oily sewage will flow into the waste oil cup along the way until there is no oil in the oil cup. 2. Soaking with detergent and vinegar.
Remove the oil smoke extraction impeller, soak it in warm pot water mixed with 3-5 drops of detergent and 50 ml of vinegar for 10-20 minutes, and then scrub it with a clean rag. The shell and other parts are also cleaned with this solution.
This method has no damage to human skin and no corrosion to equipment, and the surface still maintains its original luster after cleaning. 3. Soap surface coating method.
Make soap into paste, and then smear it on the surface of impeller and other devices. After the range hood is used for a period of time, remove the impeller and other devices and wipe it with a rag, and the oil will fall off. A wonderful way to polish stainless steel pool 1, wipe it with waste plastic wrap.
Roll the used plastic wrap into a ball to wipe the inner wall of the swimming pool. You will find the swimming pool bright and clean. It's a pity that the plastic wrap was thrown once before. 2. Wipe with a plastic bag filled with fruit, roll the collected plastic bag filled with fruit into a ball, and put some detergent in the stained place, the effect will be better.
3. Soak the towel in beer, and then pour it into the sink, which can have a quick cleaning effect. How to prevent the collected woolen clothes from being eaten by insects (1)? Before collection, remove dirt and dust, and then put it in a cool and ventilated place to dry. If possible, it is best to iron it to prevent moth breeding and achieve the purpose of killing insects and sterilizing.
(2) All kinds of woolen clothes should be hung with hangers and stored in the wardrobe. If there is no hanging condition, it should be wrapped in cloth and put on the top of the suitcase. When storing, try to put the reverse side outward.
This has two advantages: first, it can be prevented.
3. The 500-word scientific narrative of Writing Life
There is science everywhere in life, but we don't pay attention to it. People's daily life is inseparable from science. As for production, labor, sports, health and military affairs, science is even more needed. "Proud of advocating science and ashamed of ignorance" There are many established common sense in daily life, all of which are the experiences of predecessors. So we mechanically think that these common sense of life is correct. Always do it without thinking. Over time, it becomes a habit and makes your life troublesome, because these so-called "experiences" and "common sense" are just contrary to common sense in life. To believe in science, only by respecting it can we avoid taboos and be less troubled by it. It's cold in winter, and the glass bottle cap can't be unscrewed, no matter how hard it is. Experienced people put the bottle cap on the fire and bake it. This is the reason why it expands with heat and contracts with cold. When the weather is cold, the bottle cap shrinks and tightly bites the bottle mouth, which is not easy to unscrew. After the fire expands, the bottle cap becomes loose and can be opened without much effort. When the old man wears a needle, she rubs it on her hair. Do you know why? This is actually lubrication to reduce friction. People's hair contains grease, so lubricating oil is added to the needle when wiping hair, which can reduce friction and make it easy to wear the needle. Lunch meat, black beans and tomato sauce beans are all delicious canned food, and they can be preserved for a long time without spoilage. This is because canned food is sealed and bacteria can't enter. When people make canned food, it makes use of the air in which microorganisms live. Some foods can't be heated at high temperature, otherwise it will affect their nutrition and taste. For these foods, we can quickly heat them to a certain temperature (generally 60℃~ 85℃) 15 ~ 30 minutes, and then quickly cool them. This heating method can not only kill most microorganisms in food, but also keep the original taste. This heating method is called Pasteur disinfection. It was invented by the French scientist Louis Pasteur. Science should study various natural phenomena and find out the causes and laws of their emergence and development. Every little problem may lead to scientific discovery. Newton was curious about the apple landing and discovered the law of everything. James watt improved the steam engine. He jacked the lid when the water boiled. As long as we pay attention to observation and start exploring the problems around us, we can all enter the world of science. Science is all around us.
4. Write a scientific knowledge in life in the third grade composition of primary school.
Why is there a layer of skin on the surface of milk after heating? In protein, milk contains all the nutrients necessary for the growth and development of cattle, and protein is a very important one. Protein solidifies when heated. Boiled eggs will solidify because the protein in the eggs will solidify. Protein in milk will also be solidified by heating. Protein, especially protein in milk, will deteriorate and solidify even if it is not heated. Protein spoilage will produce acid, which can solidify milk. Although yogurt solidified by lactic acid bacteria is edible, it is better not to eat naturally deteriorated and solidified milk, because we don't know what kind of bacteria it will contain that can make people sick. Why do water droplets splash into hot oil and fry it? The suitable temperature of fried food is generally around 160℃~200℃. It is equivalent to putting a small amount of water attached to food into high temperature at once. As we all know, water boils at 100℃. The boiling of liquid is vaporization. At this time, its volume not only changes greatly, but also changes for a short time. When a small amount of water enters a large amount of high-temperature oil, it will explode and vaporize. In this way, the surrounding oil is splashed, resulting in "oil leakage". Explosive is a kind of violent explosive, which can explode because nitroglycerin, the main component of explosive, is composed of carbon, hydrogen, nitrogen and oxygen. When these things explode, they all produce gas due to drastic chemical changes, and their volume suddenly increases sharply. Therefore, when exploding, frying and frying food, there is a phenomenon of "oil leakage", that is, a small amount of gas evaporates rapidly in a very short time.
5. Write a composition about scientific common sense in life.
In daily life, people want their living room to be fresh, but for some reasons, there will always be some peculiar smell in the room. If it is not eliminated, it will not only affect indoor air, but also affect human health, and at the same time, it will also produce bad emotions for itself. Do you think the following common methods to eliminate indoor odor are appropriate?
There is a musty smell in the rainy season every year, and the room is very humid. The suitcases, wardrobes and drawers in the room often give off a musty smell. You can put a piece of soap in it to remove the musty smell, or you can put the sun-dried tea residue into a gauze bag and distribute it everywhere, which can not only remove the musty smell, but also emit a faint fragrance.
The taste of cigarettes is modern. Smoking seems to be a trend for both men and women. Indoor smoking is full of smoke, which is harmful to health. If you realize this problem, you can wave or light candles with gauze dipped in vinegar indoors, and the smell of smoke will be eliminated.
The smell of the kitchen is cooked in the kitchen, and the various flavors of the food are very strong. You put a little vinegar in the pot and heat it to evaporate, and the smell in the kitchen can be eliminated.
The newly painted walls or furniture have a strong smell of paint. To remove the smell of paint, you only need to put two pots of cold salt water indoors for one or two days to remove the smell of paint, and you can also soak onions in the pots, which is equally effective.
Cooking with kerosene stove or honeycomb coal will emit black smoke. If a few drops of vinegar are added to kerosene or honeycomb coal, the smell of smoke can be reduced or eliminated.
The room smells bad and the air in the room is dirty. You can drop a few drops of perfume, toilet water and wind oil on the light bulb, and when it is hot, it will give off a burst of fragrance, which is refreshing.
When stewing meat with odor, add a few pieces of orange peel to the pot to remove the odor or greasy and increase the umami flavor of the soup.
If there is fishy smell in the wok, you can heat the wok and put some used warm tea leaves, and the fishy smell will disappear.
Sour Tofu When tofu is found to have a sour taste, it can be soaked in 5% soda solution for half an hour, washed and removed.
The smell of flower fertilizer is cultivated indoors. If the fermentation broth is used as fertilizer, it will give off an odor. At this time, fresh orange peel can be chopped and mixed with liquid fertilizer to water, which can eliminate the odor.
Smell of trash can When metal garbage smells, waste newspapers can be lit and quickly put in, and the smell will be removed.
The bathroom smells. Although the bathroom at home is often washed, it still smells. After opening the lid, you can put a box of cool oil or wind oil essence in the corner of the bathroom to deodorize and repel mosquitoes. You can also put a small cup of balsamic vinegar and the stench will naturally disappear.
Oil stains on the floor Pour a little vinegar on the mop to remove oil stains on the floor. If the oil stains on the cement floor are difficult to remove, you can get some dried plant ash the night before, mix it with water into paste, and then rinse it repeatedly with clear water, and the cement floor will look brand-new.
Oil stains on the cooker After the liquefied gas cooker is stained with oil stains, it can be coated with sticky rice soup. After the rice soup crusts and dries, it can be scraped lightly with iron sheets, and the oil stains will be removed together with the rice soup crusts. If you wash it directly with thin rice soup, noodle soup or mullet bone, the effect is also good.
Glass oil stains can be wiped with alkaline decontamination powder, and then coated with sodium hydroxide or dilute ammonia solution. After half an hour, wipe it with a cloth, and the glass will become smooth.
First, sweep the dust off the surface of the screen window with a broom, then add 500 ml of water with 15g cleaning essence, and wipe it on both sides with a rag after stirring evenly to remove grease. Or add a little milk to the detergent solution, and the washed screen window will be as good as new.
Furniture oil stains can be removed by adding proper amount of vinegar in clean water and then wiping. Or soak in bleaching powder solution for a while before wiping, and the decontamination effect is also very good.
6. The 500-word scientific narrative of Writing Life
There is science everywhere in life, but we don't pay attention to it. People's daily life is inseparable from science. As for production, labor, sports, health and military affairs, science is even more needed. "Proud of advocating science and ashamed of ignorance" There are many established common sense in daily life, all of which are the experiences of predecessors. So we mechanically think that these common sense of life is correct. You often do it without thinking. Over time, it becomes a habit and makes your life troublesome, because these so-called "experiences" and "common sense" are just contrary to common sense in life. To believe in science, only by respecting it can we avoid taboos and be less troubled by it.
It's cold in winter, and the glass bottle cap often can't be unscrewed. No matter how hard it is. Experienced people can easily unscrew the bottle cap by baking it on the fire. Do you know why? This is the reason why it expands with heat and contracts with cold. When the weather is cold, the bottle cap shrinks and tightly bites the bottle mouth, which is not easy to unscrew. After the fire is heated and expanded, the bottle cap becomes loose and can be opened without much effort.
The old man's needle hardened, so she rubbed it on her hair. Do you know why? This is actually lubrication to reduce friction. People's hair contains grease. When the needle wipes the hair, it is equivalent to adding lubricating oil, which can reduce friction and make it easy to wear the needle.
Lunch meat, black beans and ketchup beans are all delicious canned food. They can be kept for a long time and are not easy to go bad. Because the can is sealed, bacteria can't get in. When people make canned food, the air inside is pumped out and then sealed. Without air, even if the food inside is stained with a little bacteria, they can't survive or reproduce! This makes use of the living conditions of microorganisms in the air.
Some foods can't be heated at high temperature, otherwise it will affect their nutrition and taste. For these foods, we can quickly heat them to a certain temperature (generally 60℃~ 85℃) 15 ~ 30 minutes, and then quickly cool them. This can kill most microorganisms in food and keep the original flavor. This heating method is called Pasteur disinfection, which was invented by French scientist louis pasteur.
Science should study various natural phenomena and find out the causes and laws of their emergence and development. Every little problem may lead to scientific discovery. Lsaac Newton was curious about the landing of apples and discovered the law of everything. James watt improved the steam engine by jacking up the lid of the pot after the water boiled. As long as we pay attention to observation and start exploring the problems around us, we can all enter the world of science. Science is all around us.
The scientific composition in life is 7.400 words.
Science is all around us. Science is closely related to life, and many phenomena in life can be explained by scientific knowledge.
In summer, the clothes in my wardrobe are basically bright and dazzling colors, and there are few dark clothes such as black. I found that black was popular now, so I pestered my mother to buy it for me. My mother disagreed and said to me, "You have heard that winter is white and summer is black." .
Is this a proverb? This is the experience that people have summed up from their life practice. Do you know the scientific truth it contains? The natural environment in which we live is rich and colorful. As we all know, sunlight is a mixture of red, orange, yellow, green, blue, indigo and purple. Different objects have different absorption and reflection abilities for different colors of light.
People can't see the light absorbed by objects, only the reflected light. Therefore, what color light an object can reflect, in our view, it has what color.
The sun not only brings people light, but also brings a lot of radiant heat. For radiant heat, black only absorbs and does not reflect, while white is just the opposite.
Generally speaking, dark things absorb more sunlight and radiant heat and reflect less; Light-colored things reflect more and absorb less. Therefore, people like to wear light-colored clothes in summer, such as white, gray, light blue and light yellow, which can reflect a lot of light and radiant heat and make people feel cool. It is best to wear black and dark blue clothes in winter. They can absorb a lot of light and radiant heat, and people naturally feel warm. "
One day, I came home from school, sweating profusely. I rushed into the kitchen to open the refrigerator and took out a bottle of drink, but the glass bottle cap wouldn't unscrew, and no matter how hard I tried. Dad was cooking, took the bottle, baked the bottle cap on the fire and unscrewed it easily.
I don't understand. Dad explained, "Do you know why? This is the reason why it expands with heat and contracts with cold. When the bottle is placed in the refrigerator, the temperature is very low, and the bottle cap shrinks, so it is not easy to unscrew it by biting the bottle mouth tightly. After the fire is heated and expanded, the bottle cap becomes loose and can be opened without much effort. "
I am happy to dance with my wine. This is really a good idea. It's so cool to drink in one gulp! In fact, there are many small scientific methods in life, all of which contain scientific principles. As long as you are willing to use your head, the method must be much more difficult. As long as we pay attention to observation and start exploring the problems around us, we can all enter the world of science.
Science is all around us.
8. Scientific composition in life
Science and I The world we live in is both mysterious and interesting. We need to explore its mystery and uncover its true colors.
Scientific knowledge is an important part of scientific literacy, and scientific inquiry is a more scientific way for us to acquire knowledge, which can make us have a deeper understanding of science and scientific concepts and things. Technology has already penetrated into our lives and integrated into one.
It is integrated with our life because it is closely related to everyone. There are sayings like "scientific fitness" and "scientific health preservation" everywhere in life. It actually embodies the practicality and instrumentality of popular science in public consciousness.
I think middle school is the golden age to cultivate scientific interest and innovation ability. Scientific inventions and creations are everywhere around us. As long as we analyze carefully, make bold assumptions, use our imagination and dare to innovate, then every teenager of us may become a scientist.
I am not proficient in science, but I still have some contact and understanding of science. Once, I poured different amounts of water into the same cup, knocked it a few times and found that the sound was different. I went online (high-tech, very useful for the benefit of mankind) to find out why.
It turns out that knocking causes the cup to vibrate, and the cup vibration drives the water surface to vibrate, thus causing the air column to vibrate. The air fluctuates, bounces back after hitting the water surface, and forms a standing wave together with the original wave (our common stringed instruments also rely on the principle of this standing wave to emit sounds of different frequencies), thus making sounds. Same.
Both the water column and the air column in the cup are vibrating, but the frequency and amplitude are different. In fact, this profound scientific principle is around us, and we should learn to use it constantly for the benefit of mankind! We should always keep scientific and technological awareness, actively participate in daily scientific and technological activities, discover the science around us, learn to solve problems in life with scientific methods, and make life full of scientific fun.
9. Who has the science of composition in life?
There is science everywhere in life, but we don't pay attention to it. People's daily life is inseparable from science. As for production, labor, sports, health and military affairs, science is even more needed. "Proud of advocating science and ashamed of ignorance" There are many established common sense in daily life, all of which are the experiences of predecessors. So we mechanically think that these common sense of life is correct. Always do it without thinking. Over time, it becomes a habit and makes your life troublesome, because these so-called "experiences" and "common sense" are just contrary to common sense in life. To believe in science, only by respecting it can we avoid taboos and be less troubled by it. It's cold in winter, and the glass bottle cap can't be unscrewed, no matter how hard it is. Experienced people put the bottle cap on the fire and bake it. This is the reason why it expands with heat and contracts with cold. When the weather is cold, the bottle cap shrinks and tightly bites the bottle mouth, which is not easy to unscrew. After the fire expands, the bottle cap becomes loose and can be opened without much effort. When the old man wears a needle, she rubs it on her hair. Do you know why? This is actually lubrication to reduce friction. People's hair contains grease, so lubricating oil is added to the needle when wiping hair, which can reduce friction and make it easy to wear the needle. Lunch meat, black beans and tomato sauce beans are all delicious canned food, and they can be preserved for a long time without spoilage. This is because canned food is sealed and bacteria can't enter. When people make canned food, it makes use of the air in which microorganisms live. Some foods can't be heated at high temperature, otherwise it will affect their nutrition and taste. For these foods, we can quickly heat them to a certain temperature (generally 60℃~ 85℃) 15 ~ 30 minutes, and then quickly cool them. This heating method can not only kill most microorganisms in food, but also keep the original taste. This heating method is called Pasteur disinfection. It was invented by the French scientist Louis Pasteur. Science should study various natural phenomena and find out the causes and laws of their emergence and development. Every little problem may lead to scientific discovery. Newton was curious about the apple landing and discovered the law of everything. James watt improved the steam engine. He jacked the lid when the water boiled. As long as we pay attention to observation and start exploring the problems around us, we can all enter the world of science. Science is all around us.