1. Why do the stars twinkle? We see the stars shining, not because the luminosity of the stars has changed, but because of the occlusion of the atmosphere.
The atmosphere is between us and the stars. When starlight passes through the atmosphere, it will be affected by the density and thickness of the atmosphere. The atmosphere is not absolutely transparent, and its transparency will change according to its density.
So when we look at the stars through it on the ground, we will see that the stars seem to be flashing. 2. Why do people yawn? When we feel tired, a lot of carbon dioxide has been produced in our bodies.
When there is too much carbon dioxide, oxygen must be supplemented to balance the needs of the body. Because these residual carbon dioxide will affect our body's functional activities, then the body will send out a protective reaction, so we yawn.
Yawning is a deep breathing action, which will let us breathe in more oxygen and expel more carbon dioxide than usual, and it can also eliminate fatigue. 3. Why can snakes walk without feet? Snakes have many scales, which are the outermost armor on their bodies.
Scales are not only used to protect the body, but also to be their "feet". When a snake crawls forward, its body will be S-shaped.
Every scale outside the S-shape will tilt upward to help the snake catch the uneven road when it moves forward. These scales cooperate with the snake's muscles and can push the body forward, so the snake can walk without feet! 4. Small question mark: Why can the helicopter stop in the air? A helicopter is a very special kind of airplane. There are no wide wings on both sides of its body, but several wings similar to ceiling fans are installed on the top of the plane, which rotate rapidly, making the air generate great lift, lifting the helicopter and sending it into the high blue sky.
5. Why do sunflowers always bloom towards the sun? There is a substance called "auxin" in the stem under the sunflower disk. This substance has the function of accelerating replication, but it is anti-optical, and it will run to the backlight side whenever it encounters light.
So when the sun rises, the stem of the sunflower immediately hides to the side of the backlight, as if the whole plant is bent in the direction of the sun. 6. Why does hair turn white when people are old? There is a substance called melanin in our hair. The more melanin, the darker our hair will be.
Without melanin, hair will turn yellow or white. When human beings reach old age, various functions of the body will gradually decline, and the formation of pigments will be less and less, so the hair will gradually turn white! 7. Why do fireflies glow? Fireflies emit light because there is a luminous body at the end of their abdomen, which is filled with a lot of phosphorus-containing luminescent substances and luminescent enzymes, so that fireflies can emit flashing light.
Fireflies shine not only for lighting, but also for courtship, vigilance and trapping. This is also a communication tool for them. Different kinds of fireflies emit light in different ways, frequencies and colors, so they can convey different information.
8. Why do you growl when you are hungry? When you are hungry, you will purr. This is because the food you have eaten before has almost been digested. Although the stomach is empty, the gastric juice in the stomach will continue to secrete. At this time, the contraction of the stomach will gradually expand, and the liquid and gas inside will be stirred up and purr.
Don't be embarrassed by your stomach growling next time! Because this is a normal physiological action.
2. What are the children's scientific knowledge?
Scientific tip for children 1, avoid overeating and catching cold: in summer, children sweat more and the blood flowing through the gastrointestinal tract decreases, while eating a lot of raw and cold food will reduce the temperature of the gastrointestinal tract and affect the digestion and absorption of nutrients in the gastrointestinal tract.
Moreover, children's gastrointestinal development is not perfect, and they are prone to indigestion, nausea, vomiting, abdominal pain, diarrhea, and even acute gastroenteritis. 2, nourishing bogey is too greasy: children's digestive function is weakened in summer, it is not appropriate to eat too nourishing and greasy food, so as not to increase the burden on the spleen and stomach and affect the digestion and absorption of nutrients.
Summer diet should choose tonics that stimulate appetite, strengthen spleen and help transport, such as white lentils, lotus seeds, red dates, duck meat and pigeon meat. In addition, the warm pathogens in summer can easily invade the human body, so you can often give your children some food, such as tea, day lily, melon, crucian carp and so on.
3, often eat bitter, sour food: bitter food can taste buds, at the same time promote saliva secretion, * * * gastric juice and bile secretion, can enhance appetite, promote digestion, and help strengthen physical fitness. Bitter foods include vegetables, lettuce, lettuce and celery.
In summer, children sweat a lot and are most likely to lose body fluids. Proper consumption of sour food can quench thirst, strengthen stomach and help digestion, such as tomatoes, lemons, strawberries and pineapples. 4, "symptomatic" drink mung bean soup: children with heatstroke or fever will also lose appetite. At this time, drinking a bowl of cool mung bean soup for children can not only quench their thirst, but also relieve summer heat and replenish qi, clear away heat and detoxify.
However, mung bean soup should be "symptomatic", including the function of relieving summer heat and detoxifying. Heat-clearing mung bean soup: Boil raw mung beans in cold water and cook for another five or six minutes.
Detoxification mung bean soup: The boiled mung bean soup is turbid in color, and the effect of clearing away heat and relieving summer heat is poor, and the effect of clearing away heat and detoxifying is good. 5. Don't let your baby eat while watching TV: For children aged 2-3, 30% of families have the habit of watching TV while eating.
Tell children that the process of eating is not only to eat nutrients, but also to make the absorption of nutrients reach the best state. Watching TV while eating will distract energy, which is not conducive to normal digestion and absorption.
6. Pay attention to eye protection for children with fever: when a child has a high fever, the body consumes a lot, which is easy to cause vitamin A deficiency. Parents should give him more foods rich in vitamin A to increase eye nutrition, such as eggs, milk, carrots and fish. And often wipe your eyes with a clean towel to avoid corneal infection. 7. Don't "calculate" early education: 42% of parents equate parent-child reading with literacy, and 32% of parents think that parent-child reading is storytelling; Most parents are concerned about their children's progress.
Experts pointed out that parent-child reading focuses on the subtle influence of knowledge and emotion, and parents should not have utilitarian plans, otherwise it will easily arouse children's resentment and backfire. 8. Asking questions in the game is easy to distract children. Many parents like to ask questions when their children are playing games, hoping that their children can learn more.
In fact, playtime should be a good time for children to exercise their attention, and extra problems will increase his burden and lead to distraction. If you want to promote parent-child relationship, you might as well replace the question with an affirmation of his serious game.
9. How to teach children to distinguish between soft and hard things? Prepare soft and hard items such as dolls and building blocks, let the children have a look and feel, talk about which is the "soft brother" and which is the "hard brother", and guide him to distinguish between soft and hard. Children can also observe which items at home are soft and which are hard, and classify them.
/kloc-What toys should children aged 0/0.2-3 play with? During this period, children walk steadily, touch more and more things, and have certain thinking and activity ability. At this time, you can buy toys that can walk and drag, such as plastic jingle cars, dragging ducklings, assembling toys, building blocks, puzzles and so on. , improve the ability of hands and brain.
3. What are the common scientific knowledge in kindergarten middle class?
1. Why do the stars twinkle?
We see the stars shining, not because the luminosity of the stars has changed, but because of the occlusion of the atmosphere. The atmosphere is between us and the stars. When starlight passes through the atmosphere, it will be affected by the density and thickness of the atmosphere. The atmosphere is not absolutely transparent, and its transparency will change according to its density. So when we look at the stars through it on the ground, we will see that the stars seem to be flashing.
2. Why do people yawn?
When we feel tired, a lot of carbon dioxide has been produced in our bodies. When there is too much carbon dioxide, oxygen must be supplemented to balance the needs of the body. Because these residual carbon dioxide will affect our body's functional activities, then the body will send out a protective reaction, so we yawn. Yawning is a deep breathing action, which will let us breathe in more oxygen and expel more carbon dioxide than usual, and it can also eliminate fatigue.
3. Why can snakes walk without feet?
Snakes have many scales, which are the outermost armor on their bodies. Scales are not only used to protect the body, but also to be their "feet". When a snake crawls forward, its body will be S-shaped. Every scale outside the S-shape will tilt upward to help the snake catch the uneven road when it moves forward. These scales cooperate with the snake's muscles and can push the body forward, so the snake can walk without feet!
4. Small question mark: Why can the helicopter stop in the air?
A helicopter is a very special kind of airplane. There are no wide wings on both sides of its body, but several wings similar to ceiling fans are installed on the top of the plane, which rotate rapidly, making the air generate great lift, lifting the helicopter and sending it into the high blue sky.
5. Why do sunflowers always bloom towards the sun?
There is a substance called "auxin" in the stem under the sunflower disk. This substance has the function of accelerating replication, but it is anti-optical, and it will run to the backlight side whenever it encounters light. So when the sun rises, the stem of the sunflower immediately hides to the side of the backlight, as if the whole plant is bent in the direction of the sun.
6. Why does hair turn white when people are old?
There is a substance called melanin in our hair. The more melanin, the darker our hair will be. Without melanin, hair will turn yellow or white. When human beings reach old age, various functions of the body will gradually decline, and the formation of pigments will be less and less, so the hair will gradually turn white!
7. Why do fireflies glow?
Fireflies emit light because there is a luminous body at the end of their abdomen, which is filled with a lot of phosphorus-containing luminescent substances and luminescent enzymes, so that fireflies can emit flashing light. Fireflies shine not only for lighting, but also for courtship, vigilance and trapping. This is also a communication tool for them. Different kinds of fireflies emit light in different ways, frequencies and colors, so they can convey different information.
8. Why do you growl when you are hungry?
When you are hungry, you will purr. This is because the food you have eaten before has almost been digested. Although the stomach is empty, the gastric juice in the stomach will continue to secrete. At this time, the contraction of the stomach will gradually expand, and the liquid and gas inside will be stirred up and purr. Don't be embarrassed by your stomach growling next time! Because this is a normal physiological action.
4. Tips for Children's Life 100 Tips for Life
1. Brushing your teeth in the morning and evening is one of the effective ways to protect your teeth.
2. Correct reading and writing posture is beneficial to protecting eyesight.
Because raw water contains bacteria and eggs, you can't drink it.
You can't go swimming in the swimming pool when pinkeye is popular.
5. The function of lung is to inhale oxygen continuously and exhale carbon dioxide.
6. Preventing myopia is mainly to achieve "three wants and three don't".
7. Hepatitis A is a highly contagious infectious disease.
8. Vaccination with BCG vaccine on time is a safe and effective method to prevent tuberculosis.
9. Sugar is good for protecting the liver.
10, not only do a good job in family hygiene, but also do a good job in environmental hygiene.
1 1, physical exercise is beneficial to our growth and physical fitness.
12, boys before puberty want * * * tight pants, girls don't want to gird their bellies and waists, and * * * high heels.
13, children can't smoke; Because smoking is very harmful to health.
14. The simplest and most economical way to prevent iodine deficiency disorders is to insist on eating iodized salt for a long time.
15, the main function of teeth is to chew food.
16, real health means that a person's physiology, psychology and ability to adapt to society and environment are in good condition.
17, the main function of fat is to supply human body with heat; Maintain body temperature; Promote the absorption of fat-soluble vitamins; Protecting internal organs and moisturizing the skin are very important to the human body.
18, maintain public health, do a good job in residential areas, streets and public places, and take good care of public health facilities.
19, to prevent anemia, we should correct bad eating habits such as partial eclipse and picky eaters.
20. First aid facilities include emergency telephone numbers (120); Ambulances and hospital emergency rooms, etc.
Our body consists of head, neck, trunk and limbs. Sugar is good for protecting the liver.
Vaccination can prevent diseases and keep healthy.
23, the correct way to brush your teeth is to brush the toothbrush, the upper teeth are brushed from top to bottom, the lower teeth are brushed from bottom to top, and the mandibular surface is brushed back and forth, from top to bottom.
24. The function of the stomach is to digest food, absorb nutrients and discharge dregs.
25, autumn is coming, the temperature is getting lower and lower, send you a text message to care: it is still hot after the summer heat, so pay attention to your health; Wear more clothes and less * * * to prevent diseases caused by cool autumn; Exercise regularly, do more exercise, be healthy, and bind your body!
26. In early autumn, the weather turned cold, and we began to make up for the enjoyment of happiness, choose less and be more sour, and adjust our diet and nutrition. Try to eat less onions, garlic, ginger, leeks and peppers, eat less fried puffed wine and eat less sour fruits and vegetables to stay healthy!
27. Drinking soup before meals varies from person to person, and it is also necessary to master the time of drinking soup. Generally, it is advisable to have half a bowl of soup before dinner and more before breakfast. After a night's sleep, the body will lose more water. At this time, drinking more soup can replenish the water lost in the body and is beneficial to the human body.
5. What are the common knowledge of children's health?
1. Educate children not to bring toys and sharp tools to the park, let alone put them in their mouth, nose and ears to avoid injury.
2. Educate children not to play with toys with their peers, let alone scratch, bite or hit their peers.
3. Go up and down the stairs to the right, don't slide down from the handrail of the stairs, and don't do dangerous actions such as climbing the window, tearing the window, jumping up the stairs, playing with the door, jumping off from a height, etc.
4. When going to public places for sightseeing, going out for a walk or outdoor activities, educate children to stay away from dangerous places such as transformers and construction sites, and listen to teachers (or adults) and don't leave the group casually. Tell the teacher if anything happens.
5. Educate children to obey the teacher's arrangement during sports or games, observe discipline, conduct activities in an orderly manner, and avoid chasing, running around and colliding with each other.
6. Explain and publicize safety knowledge to children, so that children can understand the dangers of playing with fire, electricity and water to prevent accidents.
7. Guide children to understand the purpose of fire hydrants and fire extinguishers, and know the safe passage exit of kindergartens; Educate children to form the habit of observing fire signs and evacuation instructions in public places; Know all kinds of alarm calls and know how to call the police.
The main contents of kindergarten safety education
8. After school in the afternoon, educate children to bring adults, don't run around by themselves, and don't stay in the kindergarten to prevent accidents.
9. Educate children to know their names, garden names, parents' names, work units, home addresses and telephone numbers, and they will express clearly how to protect themselves in an emergency.
10. Teach children not to trust strangers at will, not to walk with strangers privately, and not to let strangers touch their bodies. Tell children that only parents, doctors and nurses can touch their bodies. If a stranger wants to do this, he must flee as soon as possible.
1 1. Educate children not to lock their doors at home, and not to play with dangerous goods such as gas, fire, lighters, kettles, water dispensers and medicines.
12. Educate children not to cross the road without adult guidance. When crossing the road, you should obey the traffic rules, walk on the sidewalk, don't stay and play on the road, and walk on the right in the street.
13. Teach children not to open the door at will when they are alone at home. Don't open the door when they hear a knock at the door. You can say "My parents are not at home, please come back later" to prevent thieves from entering the house when adults are away.
14, when traveling or walking in the wild, don't pick flowers and fruits casually, catch insects, and don't put them in your mouth to prevent accidents.
6. There are 30 questions suitable for kindergarten to answer scientifically.
Kindergarten encyclopedia knowledge question and answer
1. Which two animals are called "ocean chameleons"?
A. hippocampus and squid B. squid and octopus C. octopus and jellyfish
2. Can penguins fly?
A.yes, b no.
3. What is the scientific name of the mermaid?
A. dugong carp
4. Which birds can imitate human language? (multiple choices)
A. myna crow myna parrot
5. What does the hedgehog eat? (multiple choices)
A. Rodents B. Ants C. Yellow worms D. Gryphon
6. What animal is Australia's national treasure?
A. kangaroo B. eagle C. panda D. koala
7. What do kangaroos eat? (multiple choices)
A. Leaves B. Paddy C. Tree vines D. Grass
8. What is the scientific name of dung beetle?
A. Cockroach B. dung beetles
9. Are snails mollusks?
A. it's B. no
10. Is Komodo dragon a lizard or a dragon?
A. lizard B. dragon
1 1. Is King cobra?
A: Yes, they are all the same snake. No, they are two kinds of snakes.
12. Who has the longest tail among birds?
A. albatross B. carving C. Rimi long-tailed pheasant
13. Who has the most beautiful tail?
A. Peacock B. Bird of Paradise C. Turkey
14. What is the most poisonous plant in the world?
A. Jatropha curcas, a poisonous vine
15. What do leeches fear most?
A. sugar hydrochloride
16. What do men eat? (multiple choices)
A. blood B. flower density C. fruit juice D. peanut oil
17. What animal is called "super high jumper"?
A. kangaroo B. jumping louse C. cockroach D. grasshopper
18. What animal is the "king of fur"? (multiple choices)
A.beaver b polar bear c water color d wolf
19. What do giant pandas like best? (multiple choices)
A leaves b bamboo shoots c bamboo leaves d grass
20. What animals sleep in summer?
A frog b sea cucumber c hippocampus d lizard
2 1. What are three similar animals? (multiple choices)
A horse b donkey c giraffe d mule
22. What kind of dog is a laughing dog?
A squirrel dog b dog c spotted dog d spotted dog
23. Is the mole a mouse?
A is B, isn't it?
24. Who runs fastest among the following animals?
Ostrich b cheetah c antelope
25. How fast can dolphins swim?
A 100 km/h B 85km/h C 65km/h D 50km/h
26. Who is the champion of "Standing Long Jump"?
Kangaroo b frog c flea
27. What are the three golden waterways in the world? (multiple choices)
Strait of Gibraltar; Panama canal; Mississippi river; Suez Canal
28. Where is the headquarters of the Organization of African Unity?
A Ethiopia b Addis Ababa c Brussels
29. Is the central government of the Netherlands located in the capital?
A is B, isn't it?
30. What's the name of Brussels?
A African capital b Asian capital c American capital d European capital
For reference.
7. parenting tips
Tips for children's health care Early childhood is the period when children grow fastest and have the most energy. In this period when the child's function and system are not fully developed, the child is the most likely to get sick.
Therefore, the health of early childhood is what parents should pay most attention to. Parents should know more about their children's health knowledge in order to help them spend this period safely and healthily.
The health of early childhood is inseparable from the baby's diet. During this period, the baby's food is the basis of the baby's growth and development. Only by constantly absorbing energy and nutrition from food can we ensure the normal health of the baby and be conducive to the baby's development and growth. Let's listen to the advice of health knowledge from parenting experts: 1. In early childhood, because the baby grows and develops rapidly, it is particularly easy to feel thirsty. It is necessary for the baby to replenish water.
Warm water is the most suitable reference for babies in this period. Other drinks or sweet drinks should not be eaten, and it is best not to eat. Because fragrant food will affect the baby's normal diet structure and eating habits.
2. The dietary structure of early childhood should be a balanced vegetarian diet, alternating between dry and wet, and coarse grains. In this way, we can ensure that the baby takes in all kinds of nutrients in a balanced way and will not cause malnutrition. The diversity of baby food is the best source of nutrition and energy for babies.
And the number of times the baby eats is also stipulated. In addition to three meals a day, snacks should be added between meals in the morning and afternoon, and no other food can be eaten after dinner except fruit. 3, for the baby's diet, in addition to balanced nutrition, but also pay attention to the freshness of food and the color and fragrance of dishes.
Fresh food is nutritious, rich in vitamins and nutrients, which is more conducive to baby absorption; A delicious dish can arouse the baby's appetite and help him eat. In addition, parents should also use scientific cooking techniques when cooking food for their babies. While ensuring the nutrition of the food, they should also ensure that the food made is convenient for children to eat, so as not to cause adverse reactions to the baby.
Therefore, experts suggest that when parents cook food for young children, the taste should be light, and the cooking methods should be mainly steaming, boiling, stewing, simmering and frying. The above content is taken from Netease Women.
8. Kindergarten scientific common sense part questionnaire
Activity objectives:
1, know all kinds of wheels, know that there are all kinds of wheels around us.
2. Explore the characteristics and uses of wheels through operational activities.
3. Interested in the application of wheels in life.
Activity preparation:
1, collect all kinds of toys with wheels, as well as a number of circular, square and triangular branches.
2, the child has a "big wheel * * *" survey registration form (children draw pictures, parents remember words), a pen.
Activity flow:
First of all, children can freely play with all kinds of wheeled instruments and explore the characteristics of wheels. answer
1, inspire children to accompany freely, by watching, touching, rolling and turning. Compare the similarities and differences of wheels and perceive the characteristics of wheels.
2. Thinking: Why are all wheels round? What about rectangular or triangular wheels?
3, children once again dispersed operation activities, by playing triangle and square operation activities, know that the original wheel can roll.
Two, the exchange of "big wheels * * *" statistics.
Thirdly, through the group test of the "moving" game, I know that "the wheels turn fast, which can save time and effort"
9. What are the common knowledge of health and safety in kindergartens?
1. Educate children not to bring toys and sharp tools to the park, let alone put them in their mouth, nose and ears to avoid injury.
2. Educate children not to play with toys with their peers, let alone scratch, bite or hit their peers.
3. Go up and down the stairs to the right, don't slide down from the handrail of the stairs, and don't do dangerous actions such as climbing the window, tearing the window, jumping up the stairs, playing with the door, jumping off from a height, etc.
4. When going to public places for sightseeing, going out for a walk or outdoor activities, educate children to stay away from dangerous places such as transformers and construction sites, and listen to teachers (or adults) and don't leave the group casually. Tell the teacher if anything happens.
5. Educate children to obey the teacher's arrangement during sports or games, observe discipline, conduct activities in an orderly manner, and avoid chasing, running around and colliding with each other.
6. Explain and publicize safety knowledge to children, so that children can understand the dangers of playing with fire, electricity and water to prevent accidents.
7. Guide children to understand the purpose of fire hydrants and fire extinguishers, and know the safe passage exit of kindergartens; Educate children to form the habit of observing fire signs and evacuation instructions in public places; Know all kinds of alarm calls and know how to call the police.
The main contents of kindergarten safety education
8. After school in the afternoon, educate children to bring adults, don't run around by themselves, and don't stay in the kindergarten to prevent accidents.
9. Educate children to know their names, garden names, parents' names, work units, home addresses and telephone numbers, and they will express clearly how to protect themselves in an emergency.
10. Teach children not to trust strangers at will, not to walk with strangers privately, and not to let strangers touch their bodies. Tell children that only parents, doctors and nurses can touch their bodies. If a stranger wants to do this, he must flee as soon as possible.
1 1. Educate children not to lock their doors at home, and not to play with dangerous goods such as gas, fire, lighters, kettles, water dispensers and medicines.
12. Educate children not to cross the road without adult guidance. When crossing the road, you should obey the traffic rules, walk on the sidewalk, don't stay and play on the road, and walk on the right in the street.
13. Teach children not to open the door at will when they are alone at home. Don't open the door when they hear a knock at the door. You can say "My parents are not at home, please come back later" to prevent thieves from entering the house when adults are away.
14, when traveling or walking in the wild, don't pick flowers and fruits casually, catch insects, and don't put them in your mouth to prevent accidents.