Small scientific knowledge
Why does sorbet get angry?
The reason why sorbet bubbles is because there is a lot of invisible water vapor in the outside air. When it comes to cold sorbet, it will liquefy into droplets when it is cold. It seems that the sorbet is bubbling.
Why do sunflowers always face the sun?
Sunflower stems contain a wonderful auxin. This auxin is very afraid of light. When it is illuminated, it will go to the backlight side, and the cells on the backlight side will multiply rapidly. Therefore, the backlit side will grow faster than the bright side, which will bend the sunflower to light.
Why does cicada shed its skin?
Cicada's shell (exoskeleton) is hard and can't expand with the growth of cicada. When the cicada grows to a certain stage, the cicada's exoskeleton restricts its growth, and the cicada loses its original exoskeleton, which is cicada slough.
2. The feeling of 50 words of scientific knowledge
The feeling of scientific knowledge
This holiday, I read a popular science book called "100,000 scientific mysteries", which made me understand a lot of life knowledge and some scientific principles, and benefited me a lot.
This book has a wide range of contents and knowledge, including many types of articles on scientific mysteries in food, scientific phenomena, transportation technology, electrical equipment, etc., and each type of article has a lot of relevant knowledge, for example, the scientific mystery in sports is "Why does the lantern turn?" "Why can't the badminton match be held outdoors?" Wait, of course, each type of article has its own type of related knowledge.
3.50 words of scientific and technological information
No supplement: compared with 65438+ million years ago, the lifestyle of human beings will not change much; Compared with before 2000, there will not be much change before 3000; Compared with 500 years ago, there will not be much change 600 years ago.
However, today's people are not the people they used to be. Even now, compared with 100 years ago, they are completely different. What has promoted the development of human history? What made mankind start a new way of life? I said, this is technology. It is the development of science and technology that promotes the progress of mankind. It is the development of science and technology that gives mankind this brand-new and beautiful life.
Throughout the ages, which dynasty and generation did not attach importance to the development of science and technology? Looking back, the four great inventions are unique; Look at the astronomical calendar and marvel; Look at Zhaozhou Arch Bridge, which is beautifully designed; A glimpse of the oriental masterpiece compendium of materia medica: look at the value of pi, seven decimal places; Overlooking the Silk Road and developing the economy; Blue and white porcelain is very famous overseas. Scientific and technological development is the road to a strong country and the first driving force for the progress of the Chinese nation. Without science, how could we have a happy life today? Without science and technology, how can we have a comfortable material life and spiritual enjoyment? Without the progress of science and technology, how can you eat hybrid 2? How can I put on cotton clothes and live in a tall building? Q: Is the development of science and technology beneficial or harmful? Without a doubt, of course it is Lida! What is the explanation? No need to explain! The 8,000-year history and civilization of Chinese civilization is irrefutable evidence. History has been changing and technology has been developing.
Humans learn to use or burn cooked food from primitive life, from relying on nature to thriving, from unarmed to metallurgical smelting. Isn't this all progress? Isn't this all development? If the disadvantages outweigh the advantages, then why do human beings choose progress in unison? Only progress can make tomorrow better! It is sad for a person not to make progress, a country is declining without progress, and a world is dark without progress. Only by continuous progress can human life be sublimated.
Man is small and fragile. He has no huge body, no strength like an ox, and no hard shell like a turtle. However, God has given mankind a clever brain and a pair of hard-working hands. Instead of enjoying success, human beings have chosen continuous progress to stand at the top of today's food chain.
Let's compare today's life with that of 10 million years ago, and we are supreme; Comparing today with thousands of years ago, we are condescending; Comparing today with hundreds of years ago, we are happy and comfortable; Comparing today with tomorrow, the future is bright. For thousands of years, it has changed from a carriage to a car, train and plane; From kerosene lamps to incandescent lamps, neon lights and energy-saving lamps; From the ends of the earth to close at hand, video chat and mouse know everything about the world.
We are happy, we are lucky, and we have caught up with an era of rapid development of science and technology, an era full of high-tech technology. This is not only because our ancestors chose development and progress in evolution, but also includes the unremitting efforts and hard work of all people. How many hard-working scientists have bought it with their wisdom and even their lives today. Because of Faraday, our life is full of all kinds of electrical appliances; Because of Darwin and Mendel, we can know ourselves better and know ourselves; Because of Bian Que, because of Hua Tuo and because of Li Shizhen, our lives can be guaranteed.
Didn't they buy everything around us? Life is so comfortable, life is so pleasant and life is so wonderful. Our average life expectancy is 30 years higher than that in ancient times, and we don't even have to go out to visit relatives and friends. Isn't this all the benefits of scientific development? Although there are disadvantages, it is irrelevant compared with the scientific and technological development concept of benefiting mankind and protecting home. As long as there are drawbacks, scientists will try to solve them. We can't stop eating because of choking, and the pace of scientific and technological development will not stop for a moment. There is nothing wrong with the development of science and technology, that is, to benefit greatly. This is the only answer to this argument! Just because science and technology have been advancing and science has been developing, cunning sophistry, generalization and unreasonable entanglement can't change this truth.
If you say that the development of science and technology does more harm than good, can you come to class without a car, gel pen, ballpoint pen and pen within a week? Can you stop watching TV, listening to the news, reading newspapers, reading books and surfing the Internet for a week? Can the developed hybrid rice not be eaten for a week? No spaghetti? Don't drink? No, no and no, because technology is closely related to you and cannot be separated from you! Now you write to the chairman, suggesting to stop all scientific research activities. Do you want people to send you flowers, or does the board of directors shoot you specially? It is true that science and technology have changed history. Without the development of science and technology, our life would be unimaginable. Our days are dark. It was the development of science and technology that saved us. It was science that saved us from the hot water age. We should respect him with awe. How can we say that the development of science and technology is full of drawbacks? Science and technology change history, and knowledge changes destiny.
We have entered the 2 1 century, an era full of high technology. Science has changed our lives, and science has changed our destiny.
"Knowledge is power". Why can our people in China, a vast country with a population of 654.38+300 million, stand tall in front of the world? Because our technology is constantly developing! Our technology is constantly improving! The advantages of scientific and technological development outweigh the disadvantages, which is an eternal theme.
4. Ask for 50 small scientific knowledge
1. The reason why sorbet bubbles is because there is a lot of invisible water vapor in the outside air. When it meets a very cold sorbet, it will liquefy into droplets and surround it when it is cold. It seems that the sorbet is bubbling.
2. Why do cicadas shed their skin? Cicada's shell (exoskeleton) is hard and can't expand with the growth of cicada. When the cicada grows to a certain stage, the cicada's exoskeleton restricts its growth, and the cicada loses its original exoskeleton, which is cicada slough. 3. How do bees make honey? First, the bees spit the sweet juice of the flowers they picked into an empty hive. At night, they suck sweet juice into their honey stomachs to make it, and then spit it out and swallow it. It takes 100~240 times to make sweet honey.
Will the fish drown? Fish have gills and can breathe in water. Fish has a swim bladder and can float freely in the water. However, some people say that fish living in water will also drown. Is it true?/You don't say. It sounds ridiculous, but it's true.
The swim bladder is the "lifebuoy" for fish swimming, and it can adjust the specific gravity of fish by inflating and deflating. In this way, when swimming, the fish can maintain a stable state and not sink or float in the water with minimal muscle activity.
However, when the fish sinks to a certain depth (that is, the "critical depth"), the huge external pressure will make the volume of the swim bladder irreparable. At this point, its buoyancy is less than its own gravity, so it will involuntarily sink to the bottom of the water, can not float up again, and will eventually drown because it can not breathe.
Although fish can still float upward by swinging their fins and tails, it won't help if they sink too deep. On the other hand, fish living in the deep sea can live freely in the deep water because their bones can bear great pressure.
If we quickly let the fish living in the deep sea reach the "critical depth", it will continue to "swell" until it comes to the surface because the pressure inside its body cannot be balanced with the smaller pressure outside. Sometimes, it even spits out its internal organs and "explodes" to die.
= = = = = = = = = = = = = = = = Children who are greedy will become stupid, and gluttony will reduce the blood flow to the brain. If you eat too much at a time, or eat all the time, a lot of blood in the human body, including blood in the brain, will be mobilized to the gastrointestinal tract. Adequate blood supply is the premise of development, and if it is often in ischemic state, its development will inevitably be affected.
Gluttony will lead to overeating in the "obese brain", especially if you eat too much nutritious food, the calories you consume will greatly exceed the calories you consume, and the heat energy will be converted into fat and accumulated in the body. If there is too much fat in brain tissue, it will cause "brain obesity".
Studies have confirmed that human intelligence is related to the number of wrinkles in the sulcus gyrus of the brain. The more obvious the sulcus gyrus, the more wrinkles, and the higher the intelligence level. The obese brain makes the sulcus close, wrinkles disappear, the cerebral cortex is smooth, the neural network is poorly developed, and the intelligence level will be reduced.
Overeating can inhibit the physiological function of the intelligent area of the brain. The way of human brain activity is that excitation and inhibition induce each other, that is, when some parts of the brain are excited, some areas of its adjacent parts are in a state of inhibition. The stronger the excitement, the deeper the inhibition on the surrounding parts, and vice versa. Therefore, if the autonomic nerve center responsible for gastrointestinal digestion is excited for a long time because of overeating, it will inevitably lead to the suppression of adjacent brain intelligent areas such as language, thinking, memory and imagination.
If these areas are often suppressed, their intelligence will get worse and worse. Overeating can damage the brain because of constipation. Snacks for children are mostly high-nutrient fine foods, which are easy to constipation.
When constipation occurs, the metabolites accumulate in the digestive tract for a long time, and after the action of intestinal bacteria, a large number of harmful substances are produced, which are easily absorbed by the intestine and enter the blood circulation, causing chronic poisoning of brain nerve cells and affecting the normal development of the brain. Overeating can also promote premature aging of the brain. In a study, scientists found that a substance that can promote premature aging of the brain-fibroblast growth factor, will increase tens of thousands of times after meals because of overeating. This is a substance that can promote arteriosclerosis, so overeating will cause premature aging of the brain in the long run.
Fifty is too much. I'm too lazy to remit money to you.
5. A 50-word description of popular science knowledge.
Popular science knowledge of snakes
Snake is a terrible word, but if you understand them, it won't be so terrible.
Snakes belong to reptiles and are cold-blooded vertebrates. Their bodies are usually covered with horny scales and crustaceans.
Snakes are a huge family. They are: boidae, the familiar giant snake, and they are a similar family; Our famous poisonous snakes-cobra and rattlesnake. ...
Speaking of snakes, we have many doubts about them, for example, why do we shed our skin? Why do they spit letters?
Why do snakes shed their skin? Because the horny protective layer on the surface of snakeskin will be worn off during crawling, they must grow a new protective layer to protect themselves before the old protective layer is broken.
Why do snakes spit out information? Because highly sensitive olfactory organs are distributed on the snake tongue, their tongues will send information about the surrounding smells to the pear nose of the upper jaw, analyze the smells, identify the direction, and look for water sources, prey and the like.
Snakes are a very magical species. Although dangerous, I am still deeply attracted!
6. 50 little scientific knowledge around you
Science is everywhere. Here are 50 scientific tips 1.
Why do you see lightning first and then hear thunder? Light waves travel faster in air than sound speed by 2. Who was the first Olympic champion in China? Xu Haifeng III.
Who invented glasses? Roger? Bacon 4. Why does the bicycle move? Bicycle tires rub against the ground.
Whose title is the following? Poet Fairy-Li Bai, Poet Saint-Du Fu,-Li He, Poet Bone-Chen Ziang, Poet Crazy-He 6. What does the moon revolve around? How long does it take to make a revolution? Earth, 27.32 days 7.
What are the three plains in China? Northeast Plain, North China Plain, Middle and Lower Reaches of the Yangtze River Plain. How many earthquakes are there on the earth every year? About 5 million times.
What is the smallest and coldest star in the solar system? Pluto 10. What is the thickness of the earth? Atmosphere 1 1.
Why are there black boxes on the plane? It is used to record all kinds of situations on the plane during the crash and help people understand the cause of the accident. What are the customs during the Spring Festival? Sweep the house, set off firecrackers, put up Spring Festival couplets, eat New Year's Eve, etc. 13.
What animal can predict earthquakes? Cattle, horses, rabbits, chickens, ducks, dogs, snakes, rats, fish, etc. What plant blooms first and leaves later? Chimonanthus praecox, kapok, forsythia suspensa, peach tree, winter jasmine, pear tree, silver willow, bauhinia, Xiang Jie, Lycoris radiata and plum blossom 15.
How do bees make hives? Every worker bee has a wax gland at the waist, which can secrete wax. This wax becomes soft and tough after chewing in the mouth, and can be used to build a honeycomb. Why is the medicine bottle so light? Because light color can reflect light, dark color absorbs more light when exposed to sunlight, so drugs are easy to deteriorate.
Who invented the steam engine? Watt 18. Which dinosaur is the hardest? Stegosaurus 19.
What is the blood of the earth? Magma 20. What is the skeleton of the earth? Rock 2 1
Why not watch welding sparks? It contains ultraviolet rays harmful to the eyes. Why can't you turn off the lights and watch TV? The screen and image of TV are relatively small. In the dark, the vision should be highly concentrated and expanded, and it is particularly sensitive to the strong reflection of light on the TV screen, which will make the eyes suffer from * * * and the vision will drop by 23%.
Who are the top ten marshals of China people? Zhu De, Peng, He Long, Chen Yi, Liu Bocheng, Luo Ronghuan, Xu, Nie, Lin Biao, ** 24. Write down the dynasties in ancient China in order. Xia, Shang, Zhou, Qin, Han, Sui, Tang, Song, Yuan, Ming and Qing 25.
Why don't rabbits need water? Because the rabbit's staple food vegetables contain a lot of water, which is enough for the body. If there is more water in the intestine, you will get gastroenteritis. But rabbits can drink water when they are short of water.
What is a meteor? It refers to meteoroids running in interstellar space (usually including cosmic dust particles and solid blocks), which are attracted by the earth due to the perturbation of the earth's gravity when approaching the earth, and then enter the earth's atmosphere and burn with it. List some outstanding astronomers in the history of China.
Zhang Heng and his party, Guo Shoujing and Li, 28 people. Who is the inventor of the battery? Volt 29.
Where is Mount Vesuvius? Italy. 1 who are the two astronauts who arrived at the moon? Armstrong and Aldrin 3 1.
Which province and city is Mount Tai in? Taishan City, Shandong Province 32. Which countries does the Amazon River flow through? Brazil, Peru and Colombia.
Which countries does the Irrawaddy River flow through? China, Myanmar. What are the five most precious gems in the world? Diamonds, sapphires, rubies, emeralds and opals.
What was the name of the ancestor of the fish? Amphioxus 37 What kind of fish glows? Ankang fish, snapper, dragon head fish, naked eye fish, etc.
How many muscles does a person have? A * * * has more than 600 muscles. Will all the wood float on the water? No, there is a kind of "steel tree" that won't float on the water.
What is the biggest flower? Dawanghua 4 1. Who invented anesthesia? Hua tuo 42.
What is the capital of France? Paris 43. What is the capital of England? London 44.
What is the capital of Japan? Tokyo 45. What is the capital of Italy? Rome 46.
What is the capital of the United States? 47 Washington. What bird is one of the ancestors of birds? Archaeopteryx 48.
What are the four seafood products in China? Pseudosciaena crocea, Pseudosciaena crocea, hairtail, squid. What is the largest mammal? Blue whale 50.
What is the largest amphibian? giant salamander
7. Ask for 50 little scientific knowledge
1. The reason why sorbet bubbles is because there is a lot of invisible water vapor in the outside air. When it meets a very cold sorbet, it will liquefy into droplets and surround it when it is cold. It seems that the sorbet is bubbling.
2. Why do cicadas shed their skin?
Cicada's shell (exoskeleton) is hard and can't expand with the growth of cicada. When the cicada grows to a certain stage, the cicada's exoskeleton restricts its growth, and the cicada loses its original exoskeleton, which is cicada slough.
3.
How do bees make honey?
First, the bees spit the sweet juice of the flowers they picked into an empty hive. At night, they suck sweet juice into their honey stomachs to make it, and then spit it out and swallow it. It takes 100~240 times to make sweet honey.
Can fish drown, too?
Fish has gills and can breathe in the water, while fish has swim bladder and can rise and fall freely in the water. However, some people say that fish living in water will also drown. Is it true?/You don't say.
It sounds ridiculous, but it's true. The swim bladder is the "lifebuoy" for fish swimming, and it can adjust the specific gravity of fish by inflating and deflating. In this way, when swimming, the fish can maintain a stable state, will not sink or float in the water, and the muscle activity is minimal. However, when the fish sinks to a certain depth (that is, the "critical depth"), the huge external pressure will make the volume of the swim bladder irreparable. At this point, its buoyancy is less than its own gravity, so it will involuntarily sink to the bottom of the water, can not float up again, and will eventually drown because it can not breathe. Although fish can still float upward by swinging their fins and tails, it won't help if they sink too deep.
On the other hand, fish living in the deep sea can live freely in the deep water because their bones can bear great pressure. If we quickly let the fish living in the deep sea reach the "critical depth", it will continue to "swell" until it comes to the surface because the pressure inside its body cannot be balanced with the smaller pressure outside. Sometimes, it even spits out its internal organs and "explodes" to die.
=============================
Greedy children become stupid
Overeating will reduce blood flow to the brain.
If you eat too much at a time, or eat all the time, a lot of blood in the human body, including blood in the brain, will be mobilized to the gastrointestinal tract. Adequate blood supply is the premise of development, and if it is often in ischemic state, its development will inevitably be affected.
Overeating can lead to "fat brain"
Eating too much, especially eating too much nutritious food, will greatly exceed the calorie intake, so that heat energy will be converted into fat and accumulated in the body. If there is too much fat in brain tissue, it will cause "brain obesity". Studies have confirmed that human intelligence is related to the number of wrinkles in the sulcus gyrus of the brain. The more obvious the sulcus gyrus, the more wrinkles and the higher the intelligence level. The obese brain makes the sulcus close, wrinkles disappear, the cerebral cortex is smooth, the neural network is poorly developed, and the intelligence level will be reduced.
Overeating can inhibit the physiological function of the intelligent area of the brain.
The way of human brain activity is that excitement and inhibition induce each other, that is, when a certain part of the brain is excited, a certain part of the area adjacent to it is in a state of inhibition. The more excited they are, the deeper the inhibition around them, and vice versa. Therefore, if the autonomic nerve center responsible for gastrointestinal digestion is excited for a long time because of overeating, it will inevitably lead to the suppression of adjacent brain intelligent areas such as language, thinking, memory and imagination. If these areas are often suppressed, their intelligence will get worse and worse.
Overeating can damage the brain because of constipation.
Children's snacks are mostly high-nutrient fine foods, which are easy to constipation. When constipation occurs, the metabolites accumulate in the digestive tract for a long time, and after the action of intestinal bacteria, a large number of harmful substances are produced, which are easily absorbed by the intestine and enter the blood circulation, causing chronic poisoning of brain nerve cells and affecting the normal development of the brain.
Overeating can also promote premature aging of the brain.
Scientists found in a study that a substance that can promote premature aging of the brain-fibroblast growth factor, will increase tens of thousands of times after meals because of overeating, which is a substance that can promote arteriosclerosis, so in the long run, overeating will make the brain premature aging.
Fifty is too much. I'm too lazy to remit money to you.
Science stories within 8.50 words.
He is full of excitement. This magical medicine has saved countless lives.
& ampLt, in the evasive action, the screen is not as bright as it was just now, blocking the light and moving back and forth. He cut off the current, although the experiment in his hand stopped: "Opportunity, form a habit? Is it a new ray that has not been discovered?
& amplt. He first wrapped a crookes discharge tube in black paper, and lead can block the rays. But the mysterious fluorescence appeared again. How can we make this surface flash on the fluorescent screen nearly one meter away? The discharge tube was wrapped in black paper just now; Br & ampgt. He changed to another book. Roentgen was shocked. It turned out that a small screen of platinum and barium cyanide stood on the workbench nearly one meter away. On Friday, only the prepared mind was left, and there seemed to be a flash of green fluorescence in front of my eyes. In the experiment, I prepare to do the experiment every day. I am 50 years old and I am determined to find a medicine. This is his success with the efforts of several scientists, but I didn't leave. So I kept changing the cover, and the effect was the same as a thick book. Br>1\, but for a moment. So can it penetrate other substances besides air? This afternoon1895165438+18 October, I was concentrating on my experiment in the laboratory and saw many soldiers die painfully because of bacterial infection in the wound. He said he grabbed the matches on the table. When Fleming was a military doctor, he repeated the discharge experiment. With the ups and downs of the induction coil, he accidentally discovered penicillin. Now it is certain that this is a new kind of ray, and Roentgen works as usual. He changed a thin lead plate again? He thought he must have observed this mysterious fluorescent fire in the darkroom all day, which made the high voltage discharge pass through the discharger. But the green light never went out, just darkness. In this dark room, there is neither winter nor summer, and this is where the fluorescence comes from. Roentgen was very excited. Is this fluorescence a sign of fate? Open the induction coil; Fleming won the Nobel Prize in Medicine. It seems that this new ray is very penetrating. "
2, but he is still staring at the screen, blackening the room, and there is a light on the screen, which goes on with a bang. However, the cathode ray should not pass through the air more than a few centimeters, and the fluorescent screen is not erected to treat diseases caused by bacteria. At this time, the craftsman came in to urge him to eat. He casually promised to call it "X-ray" for the time being, but it was still shining. Is everything all right? It's really unknown, but there will never be light, like a pale green cloud floating deep in the night sky, the discoverer of penicillin. He changed a thin piece of aluminum again. How can there be fluorescence? He has tried almost everything he can touch at hand, and blinking has little to do with distance. Think so? What should I call it for the time being, but there is no light, an illusion? He excitedly raised the screen; Fleming is a British scientist, but what's the use? Want to explore the mysteries of nature? Roentgen took out a playing card, and the black paper didn't leak light.
9. The main content of Gao Shiqi's popular science fairy tales is 50 words.
This book contains popular science fairy tales such as Biography of Mushrooms, Scattered Flower Fairy, Interview with Mr. Cholera, Girls Playing Flower Drum Talking about Mosquitoes, and Fairy Tales such as March in Heaven.
The language of Gao Shiqi's scientific sketches is vivid, lively, vivid and lively. In his youth, Gao Shiqi was deeply influenced by the spirit of the May 4th Movement-"democracy and science" and went to the United States for further study with the ideal of "saving the country through science".
During the period of 1928, he was unfortunately infected with encephalitis virus in an experiment while studying for a doctoral degree at the Institute of Medicine of the University of Chicago, resulting in an incurable disability for life. However, Gao Shiqi completed the doctoral program with amazing perseverance and joined the American Chemical Society and the American Society of Public Health.
After returning to China, Gao Shiqi worked in Nanjing Central Hospital. He hated the corruption of collusion between hospitals and corrupt officials in officialdom, and resolutely changed his name to "Gao Shiqi", solemnly declaring: "No officials except people, no money except gold". At the same time, he resigned angrily and came to Shanghai. Inspired by the new style of "scientific sketch", he began to create popular science works and found a way to contribute science to the public.
Biography of Jun 'er is his masterpiece. Juner, the hero, is one of thousands of bacteria in Qian Qian. The book was written by your son.
Please listen to the opening remarks of the fungus: I am the smallest, smallest, lightest and lightest one in the fungus family. It is so small that your naked eye can see the dust flying, but you can't see us floating in it.
It's so light that hundreds of thousands of us hang at the feet of flies, and it doesn't feel heavy. I am smaller than the fly's eyes 1000 times and lighter than the smallest dust1000 times ... What a vivid autobiography, which contains the birthplace of bacteria, their family life, their wandering in water and fire, and their adventures in various parts of the human body.
The fifteen chapters of the full text can be independent or combined into a full text. In the author's pen, your son is a character with secular desires. He sometimes explores in the respiratory tract, sometimes fights in the lung mouth, and sometimes holds a meeting in the intestinal cavity, showing the harm and prevention of bacteria to human beings incisively and vividly.