1. How to educate young children about natural science knowledge, 1,000 words

I don’t know what you mean by natural science. I think natural science knowledge refers to biology and physics. , chemistry, mathematics and other aspects of knowledge, that is, non-history, that is, knowledge of literature. For this knowledge you have to consider what characteristics they have. Which aspects of this knowledge are suitable for young children to learn and can attract children's interest. The so-called young children refer to children (except infants) who have not yet entered elementary school. You can do this:

Use subtle environmental influences, such as planting a few pots of flowers at home, and guide your children to observe when the flowers grow new leaves and what new changes occur every day. You can also raise two pots of the same flowers at the same time, place them in different environments, and let your children observe and compare the growth of the two pots of flowers. If you have time, you can take your children to the zoo to play. Let your children observe these animals. When you return home after playing, you can talk to your children about the physical characteristics of each animal and the characteristics of their diet. Why are there these characteristics? At this time, guidance can be provided in a timely manner. How about "Why do giraffes have long necks? Because during their evolution, many animals on land ate grass on land, and the leaves on the trees were very lush, so they always stretched their necks to eat the leaves on the trees. At the same time, it is easy to detect enemies in this way, and it will gradually evolve into this. "As for physical knowledge, for example, explain to the children any physical phenomena encountered in life.

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2. Do you know 100 questions about natural science?

1. When you eat something spicy and feel like it will kill you, put it in your mouth A little salt, hold it in your mouth, spit it out and rinse your mouth, it will no longer be spicy; ?2. If your teeth are yellow, you can chew peanuts in your mouth and brush your teeth for three minutes, it is very effective; 3. If you have a small area of ??skin For injuries, burns or scalds, apply a little toothpaste to immediately stop bleeding and relieve pain; ?4. Often there are ugly tea stains left in cups filled with tea, wash them with toothpaste and they will be very clean; ?5. Open your mouth slightly when you look up and nod eye drops , so that the eyes will not blink randomly; ?6. If there is an ulcer in the mouth, stick it on the ulcer with vitamin C. After it dissolves, the ulcer will be basically healed; ?7. If there is small dust in the eyes, close the eyes and exert force Cough a few times, and the dust will come out on its own; ?8. After washing your face, dip your fingers into some fine salt and rub it gently on both sides of the nose, then rinse with water. Blackheads and acne will be removed, and pores will be cleared. ?9. When you have just been bitten by a mosquito, apply soap and it will not itch; ?10. If your throat or gums are inflamed, cut the watermelon into small pieces at night and eat it with salt. Remember to If it is at night, the symptoms will be relieved and you will be fine the next day; ?11. Blow the hair dryer on the label until the glue of the label is hot, and you can easily peel off the label; ?12. Bring clothes when traveling If you are afraid of wrinkles, you can roll each piece of clothing into a roll; ?13. Drink some vinegar when you burp, and you will see immediate results; ?14. Eat something with a peculiar smell, such as garlic and stinky tofu. A few peanuts will be enough; ?15. To treat coughs, especially dry coughs, fry eggs with pure sesame oil before going to bed at night. Add a little more oil. Do not add any seasonings. Eat while it is hot and then go to bed. The effect will be obvious after taking it for several days; ?16. If a girl with thick wrists wants to wear a thinner bracelet, she should not wear it forcefully. She should put a plastic bag on her hand and then wear the bracelet. It is very easy to wear and will not touch her hands. If it hurts, take it off in the same way; ?17. The skin of chestnuts is difficult to peel. Peel off the shell first, then put it in the microwave oven and spin it. Take it out and rub it while it is hot, and the skin will fall off; ?18. When arranging flowers , add a drop of dishwashing liquid to the water and it can last for several days; ?19. Put the walnuts into the pot and steam them for ten minutes, take them out and put them in cold water and then smash them open, and you can take out the complete peach kernels; ? 20. Put the shrimps into a bowl, add a little salt and edible alkali powder, rub them with your hands for a while, then soak them in water, and then rinse them with water. The fried shrimps will be as transparent as crystal, tender and delicious; ?21 .When frying meat, first soak the meat in baking soda water for ten minutes, pour out the water, and then add the flavor. The fried meat will be very tender and smooth; ?22. Soak the remaining tea leaves in water for a few days, then pour it on the roots of the plants, which can promote the growth of the plants. growth; ?23. Dry the remaining tea leaves and put them in toilets or ditches to burn and smoke them, which can eliminate the odor and have the function of driving away mosquitoes and flies; ?24. How to re-cook the rice with uncooked rice: You can use chopsticks to stick some holes in the rice that go straight to the bottom of the pot. hole, sprinkle a little rice wine and simmer again, ?25. If only the surface is raw, just flip the surface to the middle and simmer again; ?26. How to remove greasiness from screen windows: put the cigarette butts left from washing clothes and smoking in the water , after dissolving, use it to clean glass windows and screens, the effect is really good; ?27. Just put a small piece of chalk in the jewelry box to keep the jewelry shiny; ?28. The surface of the table and bottle is not smooth Traces of dried glue can be wiped with wind oil essence; ?29. Always carry a small dry battery in your bag when going out. If your skirt has static electricity, rub the positive terminal of the battery on the skirt a few times to remove the static electricity; ?30. No matter If any part of the shoe rubs your foot, you can apply a little white wine on the place where the shoe rubs your foot to ensure that it will not rub your foot. 31. When cooking vegetables, if you must blanch them, the best water is used to blanch the vegetables. Make the most of it.

For example, when making dumplings, an appropriate amount of blanched water can be put into the meat filling, which not only ensures nutrition, but also makes the dumpling filling delicious and soupy; ?32. Feet are prone to sweating in summer, so use it every day Soaking your feet in light salt water can effectively deal with sweaty feet; ?33. Sunbathing after swimming in summer can prevent skin strain and other diseases; ?34. Pillows are prone to moisture and mold growth in summer, and frequent exposure to the sun is good for your health; ?35. Eat more Barley and adzuki bean porridge and other moist foods can strengthen the spleen and prevent heatstroke; 36. Prevent insomnia: talk less before going to bed, avoid drinking strong tea, do not use your brain before going to bed, and wash your feet with hot water and vinegar; 37. Honeysuckle It has the effect of dispersing rheumatism. Decoction the juice of honeysuckle and mix it with honey to relieve summer heat. ?38. Drinking tea after eating too fatty food can stimulate the autonomic nervous system and promote fat metabolism. ?39. Lack of sleep will cause To become stupid, you need eight hours of sleep a day, and having a nap habit can delay aging; ?40. Your hands can easily become dry and rough, so soaking your hands in vinegar for ten minutes can protect your skin; ?41. In summer, wipe the mat with clean water with toilet water added. The mat can keep the mat fresh and clean. Of course, it is best to wipe along the lines of the mat, so that the toilet water can penetrate into the lines and gaps of the mat, so that the cool and comfortable feeling will last longer; 42. Eat more tomatoes, citric acid and other acidic vegetables and fruits for breakfast, which is good for nourishing the liver ; ?43. Refreshing and anti-itching. When washing your hair or taking a bath, add five or six drops of toilet water in the water, which can have a good cooling effect, remove bacteria, remove prickly heat and relieve itching; ?44. Grapes contain sleep-auxiliary hormones, and regular consumption can help sleep ?45. Drinking more tomato soup in summer can not only obtain nutrients, but also replenish water. Tomato soup should be cooked and cooled before drinking. The lycopene contained in it has certain effects on fighting prostate cancer and protecting myocardium. It is most suitable for Men; Brushing your teeth immediately after eating acidic substances will damage your dental health; ?46. When the skin is broken due to trauma, apply toothpaste on the injured area to reduce inflammation and stop bleeding, and then bandage it. As a temporary first aid drug, medicated toothpaste is the most effective; ?47 .Spray white vinegar on the cutting board and leave it for half an hour before washing it. It can not only sterilize but also remove odor; ?48. Drinking yogurt can relieve irritability after hangover. Yogurt can protect the gastric mucosa, delay alcohol absorption, and contains calcium. Rich in alcohol, it is especially effective in relieving irritability after drinking; ?49. When the foreskin of leather shoes has been stored for a long time and becomes moldy, you can use a soft cloth dipped in alcohol and water (1:1) solution to wipe it; ?50. When you have a headache or dizziness, you can apply it on the temples Use toothpaste, because toothpaste contains menthol and clove oil, which can relieve pain; ?51. Freeze candles for 24 hours before inserting them into the birthday cake. The candle oil will not flow when lit; ?52. White clothes are easy to wash after washing For yellowing, you can take a basin of water, add two or three drops of blue ink, soak the washed clothes for a quarter of an hour, do not wring them out, just put them in the sun to dry them, and they will become white and clean; ?53.

3. Do you know 100 questions about natural science?

1. When you feel like you are going to be burned to death after eating something spicy, put a little salt in your mouth. , suck it, spit it out, rinse your mouth, it will no longer be spicy; ?2. If your teeth are yellow, you can chew peanuts in your mouth and brush your teeth for three minutes, it is very effective; 3. If there is a small area of ??skin damage or For burns or scalds, apply a little toothpaste to immediately stop bleeding and relieve pain; ?4. Often there are ugly tea stains left in the cups filled with tea, wash them with toothpaste and they will be very clean; ?5. Open your mouth slightly when you nod eye drops, like this Your eyes will no longer blink randomly; ?6. If you have an ulcer in your mouth, stick it on the ulcer with vitamin C. After it dissolves, the ulcer will be basically healed; ?7. If there is small dust in your eyes, close your eyes and cough hard for a few times. ?8. After washing your face, dip your fingers into some fine salt and rub it gently on both sides of your nose, then rinse with water. Blackheads and acne will be removed, and pores will also be cleared. ?9. When you have just been bitten by a mosquito, apply soap and it will not itch; ?10. If your throat or gums are inflamed, cut the watermelon into small pieces at night and eat it with salt. Remember to do it at night , the symptoms will be relieved at that time, and you will be fine the next day; ?11. Blow the hair dryer on the label, and when the glue of the label is hot, you can easily tear off the label; ?12. If you are traveling with clothes If you are afraid of wrinkles, you can roll each piece of clothing into a roll; ?13. Drink some vinegar when you burp, and you will see immediate results; ?14. Eat a few stinky things, such as garlic and stinky tofu. Peanuts will be fine; ?15. To treat coughs, especially dry coughs, before going to bed at night, fry eggs with pure sesame oil, add a little more oil, and do not add any seasonings. Eat it while it is hot before going to bed, and even eat it The effect will be obvious in a few days; ?16. If a girl with thick wrists wants to wear a thinner bracelet, she should not wear it forcefully. She should put a plastic bag on her hand and then wear the bracelet. It is very easy to wear and will not hurt her hand. The same method is used to remove it; ?17. Chestnut skin is difficult to peel. Peel off the shell first, then put it in the microwave oven for a spin, take it out and rub it while it is hot, and the skin will fall off; ?18. When arranging flowers, A drop of dishwashing liquid in the water can last for several days; ?19. Steam the walnuts in a pot for ten minutes, take them out and put them in cold water and then smash them open, and you can take out the complete peach kernels; ?20. Put the shrimp into a bowl, add a little salt and edible alkali powder, rub it with your hands for a while, soak it in water, and then rinse it with water. The fried shrimp will be as transparent as crystal, tender and delicious; ? 21. Stir-fry When cooking meat, first soak the meat in baking soda water for ten minutes, pour out the water, and then add the flavor. It will be very tender when fried; ? 22. Soak the remaining tea leaves in water for a few days, then pour it on the roots of the plants to promote plant growth; ?23. Dry the remaining tea leaves and put them in toilets or ditches to burn and smoke them, which can eliminate the odor and have the function of driving away mosquitoes and flies; ?24. How to recook raw rice with rice: You can use chopsticks to poke some holes in the rice that go straight to the bottom of the pot. Sprinkle a little rice wine and simmer again, ?25. If only the surface is cooked, just flip the surface to the middle and simmer again; ?26. How to remove greasiness from screen windows: put the cigarette butts left from washing clothes and smoking in the water, and wait After dissolving, use it to clean glass windows and screens, the effect is really good; ?27. Just put a small piece of chalk in the jewelry box to keep the jewelry shiny; ?28. Stickers on the surface of tables and bottles Traces can be wiped with wind oil essence; ?29. Always carry a small dry battery in your bag when going out. If your skirt has static electricity, rub the positive terminal of the battery on the skirt a few times to remove the static electricity; ?30. Whether it is shoes Wherever the shoe rubs your foot, you can apply a little white wine on the place where the shoe rubs your foot to ensure that it will not rub your foot; 31. When cooking vegetables, if you must blanch them, it is best to use the water used to blanch the vegetables. .

For example, when making dumplings, an appropriate amount of blanched water can be put into the meat filling, which not only ensures nutrition, but also makes the dumpling filling delicious and soupy; ?32. Feet are prone to sweating in summer, so use it every day Soaking your feet in light salt water can effectively deal with sweaty feet; ?33. Sunbathing after swimming in summer can prevent skin strain and other diseases; ?34. Pillows are prone to moisture and mold growth in summer, and frequent exposure to the sun is good for your health; ?35. Eat more Barley and adzuki bean porridge and other moist foods can strengthen the spleen and prevent heatstroke; 36. Prevent insomnia: talk less before going to bed, avoid drinking strong tea, do not use your brain before going to bed, and wash your feet with hot water and vinegar; 37. Honeysuckle It has the effect of dispersing rheumatism. Decoction the juice of honeysuckle and mix it with honey to relieve summer heat. ?38. Drinking tea after eating too fatty food can stimulate the autonomic nervous system and promote fat metabolism. ?39. Lack of sleep will cause To become stupid, you need eight hours of sleep a day, and having a nap habit can delay aging; ?40. Your hands can easily become dry and rough, so soaking your hands in vinegar for ten minutes can protect your skin; ?41. In summer, wipe the mat with clean water with toilet water added. The mat can keep the mat fresh and clean. Of course, it is best to wipe along the lines of the mat, so that the toilet water can penetrate into the lines and gaps of the mat, so that the cool and comfortable feeling will last longer; 42. Eat more tomatoes, citric acid and other acidic vegetables and fruits for breakfast, which is good for nourishing the liver ; ?43. Refreshing and anti-itching. When washing your hair or taking a bath, add five or six drops of toilet water in the water, which can have a good cooling effect, remove bacteria, remove prickly heat and relieve itching; ?44. Grapes contain sleep-auxiliary hormones, and regular consumption can help sleep ?45. Drinking more tomato soup in summer can not only obtain nutrients, but also replenish water. Tomato soup should be cooked and cooled before drinking. The lycopene contained in it has certain effects on fighting prostate cancer and protecting myocardium. It is most suitable for Men; Brushing your teeth immediately after eating acidic substances will damage your dental health; ?46. When the skin is broken due to trauma, apply toothpaste on the injured area to reduce inflammation and stop bleeding, and then bandage it. As a temporary first aid drug, medicated toothpaste is the most effective; ?47 .Spray white vinegar on the cutting board and leave it for half an hour before washing it. It can not only sterilize but also remove odor; ?48. Drinking yogurt can relieve irritability after hangover. Yogurt can protect the gastric mucosa, delay alcohol absorption, and contains calcium. Rich in alcohol, it is especially effective in relieving irritability after drinking; ?49. When the foreskin of leather shoes has been stored for a long time and becomes moldy, you can use a soft cloth dipped in alcohol and water (1:1) solution to wipe it; ?50. When you have a headache or dizziness, you can apply it on the temples Use toothpaste, because toothpaste contains menthol and clove oil, which can relieve pain; ?51. Freeze candles for 24 hours before inserting them into the birthday cake. The candle oil will not flow when lit; ?52. White clothes are easy to wash after washing If it turns yellow, you can take a basin of water, add two or three drops of blue ink, and soak the washed clothes for a quarter of an hour. Do not wring them out, but just put them in the sun to make them white and clean; 53. Excessive consumption of raw materials .

4. Collect natural science knowledge ppt suitable for preschool children to learn

Safety knowledge and fire safety knowledge 1. Liquefied petroleum gas stoves cannot be placed in bedrooms, offices, or balconies. Or in public places such as warehouses and auditoriums to prevent air leakage and fire.

Second, correctly master the use of the switch. Wait for fire for gas, not gas for fire. Remember to turn off the valve and switch after use. If the valve is broken, replace it in time. Do not allow children to use the stove or play with the switches.

Third, when using liquefied gas, someone must supervise it and not stay away. Pay attention to adjusting the size of the fire head at any time to prevent the soup from overflowing and extinguishing the flame or being blown out by the wind, causing outgassing. Fourth, the liquefied gas tank should be kept upright and cannot be placed upside down, let alone soaked in boiling water or grilled over fire.

5. If you find air leakage, you should take immediate measures: open doors and windows, use a fan to ventilate (but do not blow with an electric fan), and then look for the location of the air leak. Basic knowledge of fire extinguishing (1) Isolation method: This is a method of eliminating flammable materials.

(2) Suffocation method: Prevent air from flowing into the combustion zone, reduce the oxygen content in the air, and prevent the fire source from getting enough oxygen to extinguish it.

(3) Cooling method: Spray water or other fire extinguishing agents onto the burning materials to reduce the temperature of the burning materials below the ignition point, forcing the material to stop burning; or spray water and fire extinguishing agents onto the combustible materials near the fire source to reduce the flammability temperature of the object to prevent the fire from expanding.

(4) Suppression method. Hope this helps.

5. Collect natural science knowledge ppt suitable for preschool children to learn

Safety knowledge and fire safety knowledge 1. Liquefied petroleum gas stoves cannot be placed in bedrooms, offices, or balconies. Or in public places such as warehouses and auditoriums to prevent air leakage and fire.

Second, correctly master the use of the switch. Wait for fire for gas, not gas for fire. Remember to turn off the valve and switch after use. If the valve is broken, replace it in time. Do not allow children to use the stove or play with the switches.

Third, when using liquefied gas, someone must supervise it and not stay away. Pay attention to adjusting the size of the fire head at any time to prevent the soup from overflowing and extinguishing the flame or being blown out by the wind, causing outgassing. Fourth, the liquefied gas tank should be kept upright and cannot be placed upside down, let alone soaked in boiling water or grilled over fire.

5. If you find air leakage, you should take immediate measures: open doors and windows, use a fan to ventilate (but do not blow with an electric fan), and then look for the location of the air leak. Basic knowledge of fire extinguishing (1) Isolation method: This is a method of eliminating flammable materials.

(2) Suffocation method: Prevent air from flowing into the combustion zone, reduce the oxygen content in the air, and prevent the fire source from getting enough oxygen to extinguish it. (3) Cooling method: Spray water or other fire extinguishing agents onto the burning materials to reduce the temperature of the burning materials below the ignition point, forcing the material to stop burning; or spray water and fire extinguishing agents onto the combustible materials near the fire source to reduce the flammability temperature of the object to prevent the fire from expanding.

(4) Suppression method. Hope this helps.

6. Mysteries of nature. Who has little knowledge of nature?

Overview of nature - water, air, mountains, rivers, microorganisms, plants, animals, earth, universe etc., all belong to the category of nature; the science of studying nature is natural science, including mathematics, physics, chemistry, biology, geography and other sciences, and the branches of these sciences are very numerous and complicated, such as: biology Science can be divided into three major disciplines: microbiology, botany, and zoology. It can further be divided into molecular biology, cytology, genetics, physiology, etc. The intersection of various disciplines will lead to many sub-disciplines, such as biochemistry. , biophysics, molecular structure biology, etc. Man and Nature The birth of human beings by nature shows that it respects human behavior. On the contrary, human beings should respect nature even more. On the surface, humans are born from parents, but in fact they are born from parents. Naturally, with human photon information, the human embryo can absorb this photon information from nature and grow the embryo into an adult. It is born from the parents. At the same time, it is nature that completes the stimulation of the dark matter of the embryo. There are 45,336 species of vertebrates in nature. , including 1,244 species of birds and 3,862 species of fish. There are more than 3 million species of insects, and only more than 1 million species have been confirmed. Nature is a natural resource, and humans and nature should respect each other and maintain a cherishing and caring attitude. Use nature moderately and prevent it from being destroyed so that the living environment is beautiful and natural resources are not exhausted. They are as close and harmonious as mother and child. Therefore, the richness of information about nature can only be described as a vast ocean. It is too complex to be explained in 30,000 to 20,000 words or by a few people. Classification of Nature There are various living things in nature, including three major categories: plants, animals, bacteria and fungi. At the same time, nature is also a system that contains various ecosystems. place! The elements of nature are divided into seven types: light, darkness, water, fire, wind, thunder, and earth, which means that nature controls the balance of these things. Nature has the greatest influence on the spirit in terms of time. First, the place is the most important. Every day, the sun; after sunset, the night, and her stars. The wind is always blowing; the grass is always growing. Every day, men and women talk and watch, Being watched. Of all people, that image attracts the most to the philosopher. He must decide its value in his own mind. What is nature to him? This web of God, its incomprehensible continuity, never begins, never ends, is always a circular force, returning to itself. In this it resembles his own soul, and he can never find it. The beginning and end of the universe - so complete, so infinite. The brilliance of nature also shines so far, and there are universes above the universe, radiating out like rays of light, up and down, without a center or a circle - whether it is gathered Or scattered, nature is eager to express herself to the human heart. It begins to classify. In the heart of the young man, everything is individual and stands there alone. Gradually, he knows how to classify Two things were joined together, recognizing their absolute identity; then three things, then three thousand; and then, dominated by his own instinct to unite everything, he continued to tie things together, less and less. Regular phenomena, discovering roots in the ground, connecting opposite and distant things, blooming on the same branch. He soon learned that since the beginning of history, facts have been continuously gathered and classified. However, "classification" "What does it mean?" It is nothing more than seeing that these things are not chaotic and have no relationship with each other, but have certain laws, which are also the laws of the human mind. Geometry is purely an abstract thing in the human mind, and astronomers Discovered that the movement of the planets can be measured using geometry. Chemists discovered that there are proportions and understandable laws in all matter; what is science? It is nothing more than discovering similarities and similarities in the most distant things. A man with great ambitions sits down to study every uncontrollable fact; one by one, all strange structures and all new forces are classified into their categories. reduced to their theorems, and so on forever, using profound observation to give life to the last fiber of every organization and to the outer edges of nature.

Therefore, the schoolchild under this sky feels that he and nature "are born from the same root"; one is a leaf, the other is a flower; friendship and sympathy are active in every blood vessel. What are the roots of a tree? Is it not the soul of his soul? A too bold idea; a too absurd dream. However, once the brilliance of the soul helped him discover the laws of more tangible physical properties - when he knew how to worship the soul, and saw that the existing natural philosophy was only about the soul When the giant hand first explores, he will look forward to ever-increasing knowledge, so as to become a future Creator. He will see that nature is the opposite of the soul, and each part corresponds to the other. One is the seal, the other is the print. The word. Its beauty is the beauty of his own soul. Its laws are the laws of his own soul. Therefore he regards nature as the measurer of his own achievements. The extent to which he does not know enough about nature is that he We still don’t have enough grasp of our own soul. In short, the ancient motto, “Know thyself”, and the modern motto, “Study nature”, have finally become the same motto. Verses in Praise of Nature 1. Poems are everywhere There are always flowers in the environment - "Lingmei" by Zhang Daoqia, Song Dynasty 2. Flowers are flying everywhere in the spring city - "Cold Food" by Han Hong, Tang Dynasty 3. There should be no such thing as a stick of incense in the hand - "Wang Anshi, Song Dynasty" "Song of Sweet Dew" 4. The dawn is light and cold outside the green poplar smoke, and the spring is stirring on the red apricot branches - Song Qi's "Spring in the Jade House" 5. The garden is full of spring scenery, and a branch of red apricot comes out of the wall - Song Dynasty's "Ye Shaoweng" "It's not worth visiting the garden" 6. It is easy to recognize that when the east wind faces the east wind, it is always spring when it is colorful - Zhu Xi's "Spring Day" of the Song Dynasty 7. When the sun rises, the flowers on the river are as red as the fire, and when spring comes, the water of the river is as green as blue - "Recalling Jiangnan" by Bai Juyi of the Tang Dynasty 8. Concentrated The green branches are a little red, and the moving spring scenery does not need to be too much - Wang Anshi, Song Dynasty, "Ode to Pomegranate Flowers" 9. Listen to the spring rain in the small building all night, and sell apricot flowers in the deep alleys in the Ming Dynasty - Lu You, Song Dynasty, "The First Spring Rain in Lin'an" 10. Shu The shadows are slanting across the clear and shallow water, and the faint fragrance floats in the moonlight at dusk--"Small Plum in the Mountain Garden" by Lin Bu of the Song Dynasty. 11. The peach and plum blossoms in the city are worried about the wind and rain, and the shepherd's purse flowers in the stream in spring--"Partridge Sky. Ode of the Generations" by Xin Qiji of the Song Dynasty 12. The spring breeze does not let go of the poplar flowers, and they flutter in the faces of passers-by - Yan Shu, Song Dynasty, "Treading on the Shasha" 13. In February and March of spring, the grass and water are the same color - "Meng Zhu", an ancient Yuefu poem in Jin Dynasty 14. February in the south of the Yangtze River Much fragrance.

7. Natural science knowledge

Three major discoveries in natural science in the 19th century:

1. Cell theory

The main contents are: cells It is the basic structural unit of animal and plant organisms and the basic unit of life activities. In this way, the structural unity of the entire biological world is demonstrated. Cells connect all species in the biological world, and there are kinship relationships between organisms. This is a huge support for the theory of biological evolution. The establishment of the cell theory strongly promoted the development of biology and provided an important natural scientific basis for dialectical materialism. Engels spoke highly of this and hailed the cell theory as one of the three major discoveries of natural science in the 19th century.

2. Theory of Biological Evolution

In 1859, Darwin, a British biologist and founder of the theory of biological evolution, proposed the theory of natural selection of biological evolution in his masterpiece "The Origin of Species". The key point of this theory is that individuals in a group have different traits, and these individuals have different adaptability to the environment in which they live; due to limited space and food, there is competition for survival among individuals. As a result, individuals with favorable traits survive and pass. Reproduction is passed on to offspring, and individuals with unfavorable traits will gradually be eliminated (Darwin called this process of retaining the best and eliminating the poor in nature); due to the long-term effect of natural selection, traits may appear in the same species distributed in different areas divergence and leading to the formation of new species.

3. The law of energy conservation and transformation

The law of energy conservation and transformation is an important theoretical cornerstone of natural science in the 19th century. The primary significance of energy conservation is to establish the equivalence relationship between certain physical quantities in the process of material movement and change.

In this regard, we do not need to know the actual interaction process between materials, nor do we need to know the conversion path between energy in the process of material movement and change. As long as we establish the relationship between energy and physical quantities corresponding to the material movement state, we can understand the movement of materials. Establish an equivalence relationship between the initial state and the final state during the change process, which facilitates the quantitative calculation of the material movement change process

8. Why should children master basic natural science knowledge

3. In "Small Science Experiments and Science Games", children can master basic natural science knowledge. Small science experiments can not only help children acquire extensive scientific knowledge and establish concepts based on perceptual experience, but also develop Children's intellectual skills such as observation, classification, measurement and thinking stimulate children's exploration spirit.

For example: In an experiment on what magnets can attract, children were allowed to use fishing poles with magnets attached to catch fish made of iron sheets, plastic sheets, paper, etc. It was found that only the fish made of iron sheets All the fish were caught, but none of the other fish were caught. What's the point? Through the teacher's inspiration and guidance, children understand the principle that magnets can attract iron, thereby cultivating children's learning habits of using their brains and actively thinking, and developing their imagination and thinking abilities.