A common "disease" in primary school popular science composition 1 life, it doesn't need to see a doctor, take medicine or have an injection, just drink more boiled water. Guess what this "disease" is?
Yes, it's a nosebleed! Although not sick, only 0. 1% of us have never had a nosebleed in our lives. What a small number this is! Therefore, we should also pay attention! Why can this "disease" be cured without a doctor? Because drinking more boiled water and eating less food and drinks containing preservatives can avoid this "disease".
A nosebleed means a nosebleed. If a person often has nosebleeds, he will be very weak, often suffer from various diseases, and even die seriously. But we can treat it. Drink more boiled water; Eat less and drink less, and get angry with preservatives.
But how to prevent it? If you have a nosebleed, it will do great harm to your body! Will feel dizzy, want to vomit and so on! And it will make clothes ugly. If you want the right way. Some people will block their nostrils with paper towels after a nosebleed, which is all wet! You should hold your nostril with your hand (hold your left nostril with your left hand) and wash your face with your other hand. You can also use ice or sorbet to compress your forehead and stop the bleeding slowly. But in the following three cases, you should seek medical attention in time:
1. The nosebleed is so bad that I can't stop it.
2. Frequent nosebleeds
I think I have a nosebleed because of some disease.
Please drink more boiled water, eat less and drink less unhealthy food and drinks! Pay attention to the "disease" of nosebleeds!
I think some people may have experienced the pain of bee sting. Looking at the red and swollen skin, I believe they will hate this "culprit". In fact, bees don't sting people unless they have to, because they will die if they are stung. You may say that if you just want people to suffer a little loss and pain, it is not called "losing yourself and breaking the needle".
Bees sting only under special circumstances. They don't like black things, and they don't like the special taste of wine, onion and garlic. If people offend bees because they violate their "taboos", they are in danger of being stung by bees; When people tease or beat bees, they will rise up to defend themselves and attack the enemy regardless.
You may ask why bees sting people and die, because they sting people with needles at the end of their abdomen. The bayonet consists of a back bayonet and two belly bayonets. The back is connected with large and small glands and some internal organs. There are several small barbs on the tip of the needle. When a bee sticks a needle into a person's skin and pulls it out, because the small barb is firmly hooked on the skin, the needle and internal organs will fall off, so the bee will definitely die. According to my series of descriptions, do you understand? So bees don't approach enemies in the same way. Everything has two sides, and this is no exception. If a bee bites an insect with hard skin, such as a beetle, it can pull the needle back from the gap and escape its fate.
There are many spiny creatures in nature, such as seaweed, octopus and wasp. I won't introduce them one by one. Through the introduction just now, I think you should know the habits of bees. For more information about natural phenomena, listen to the next chapter.
Time flies, and half a semester passed quickly in a blink of an eye. During this half term, many things happened: some made me happy, some made me sad, some bothered me ... What impressed me most was visiting a large animal science exhibition.
On Saturday afternoon, it was sunny. When my father and I came to the front of Wu Yuqing Science and Technology Museum in Zhenshan Park, the seven characters "Large-scale Animal Science Exhibition" appeared in front of us. We bought tickets and entered the exhibition hall. Wow! There are so many people in the exhibition hall: there are old people, children, adults and students, and the whole exhibition hall is packed.
We began to visit. There are so many animals on display in the exhibition hall! There are flying wenbirds, owls and lucky birds; Bamboo rat, tiger palace guard, peacock walking on land; There are soft-shelled turtles, Chinese soft-shelled turtles and Chinese sturgeons living in the water; There are amphibians, crocodiles and so on. There are so many kinds that I really feast my eyes! My father also picked up his mobile phone and took many photos.
Among them, I like a small animal called wenbird best. They are small and exquisite, brightly colored and very pleasing in appearance. I really want to take a few back to raise them at home and accompany them every day.
Various ancient educational toys are also displayed in the exhibition hall. Everyone can't help playing with them when they see them, even adults enjoy it.
This large animal science exhibition is very interesting. It broadens my horizons, increases my knowledge and lets me know about animals I have never seen before. When I left the Science and Technology Museum, I reluctantly went back to see it again. I really hope that more popular science exhibitions will come to us in the future.
Goodbye, my lovely animals!
On Saturday, I heard that Suqian Cultural and Art Center has a large-scale popular science exhibition on "The Mysteries of Nature". I took my father regardless of his life.
When we arrived at the Cultural and Art Center, the first thing we saw was a tall building. My father and I walked into a big room-exhibition room with great interest.
There are many things here, including dinosaur fossils that have gone through 100 million years, realgar corals, crystal clear crystals and all kinds of marble. Among them, the most attractive thing for me is the night pearl that radiates lovely light.
The luminous pearl is a crystal clear mineral called fluorite, which is mainly blue, green or blue-green. So why does the night pearl shine at night? This is a problem. It turns out that under the irradiation of high-energy ultraviolet light during the day, the outer electrons of atoms or ions in the crystal are temporarily excited by high energy after absorbing energy, and the electrons excited in the dark at night return to the ground state at a certain speed and release energy at the same time, so they emit beautiful light and can continue to emit light for a certain period of time. Luminous crystals and minerals are extremely scarce, and large minerals are more difficult to collect, so large-sized luminous pearls are particularly precious.
I participated in the popular science exhibition today and learned a lot of popular science knowledge. I like popular science.
Doing experiments is my favorite form of entertainment. I often go to the bookstore to read some books about doing experiments, and then go home to do experiments from memory.
On this day, I came to the bookstore again and suddenly found a strange experiment: match dancing. Can you believe that naked matches can dance in the water? I can't believe it. I came home with a curious heart, ready to solve my doubts by doing experiments.
Back home, as usual, I started the experiment from memory.
I brought a basin of water, a match and a bottle of "all-purpose glue". I applied a thick layer of "all-purpose glue" to the match head, and then carefully put the match into the clear water. After waiting for a while, I didn't see any response. I calmed down and waited patiently. A few minutes passed. "Miracle" really appeared! I saw matches standing upright in the water and dancing with the swing. However, in less than half a minute, the match floated on the water again. A few minutes later, the match began to dance again. This cycle lasted seven or eight times, and the match never moved again.
What magical power drives matches to "dance"? My mind is full of doubts and I can't figure it out. Finally, my silent teacher, the computer, helped me. It turns out that when the "all-purpose glue" comes into contact with the phosphorus on the match head, it will produce a substance. The more this substance accumulates, the more it will make the match stand upright. When this substance volatilizes, matches are driven to dance. After a while, the outermost substance of the matchhead evaporated and the match did not move. During this time, the generated substances gather again, and the matches "dance" again until the reaction between the all-purpose glue and phosphorus is over.
At this moment, I suddenly realized: Ah! Matchsticks can dance, so that's it!
On Wednesday morning, several "popular science caravans" drove to our school. It turns out that this is the activity of "Popularizing Science into Campus" organized by Zhengzhou Science and Technology Museum, and it will be held in our school today!
During the morning break, students flocked to the playground to watch these interesting exhibits that dazzled us.
Huh? Where did the crowd gather? What is this? I also rushed there. It turned out to be a quiz on popular science knowledge! The teacher who asked questions gave some prizes to the winners-several Nobel prizes in science-for a hundred years.
Ah! What greedy eyes!
However, there are so many people there that I can't squeeze in at all! At this time, Teacher Ma happened to come over and saw that I was in a hurry. He asked me, "Chang Pengrui, can you solve these problems?" "Yes, yes!" On the recommendation of Mr. Ma, the teacher of the Science and Technology Museum agreed to let me try.
The teacher asked me, "What is the principle of the exhibit' flipping the image'?" Haha, I can't beat this! "This is because there are three mirrors in this exhibit, and the light is reflected three times, and the image seen in the mirror becomes like this." I remembered it almost word for word! Needless to say, I got a book!
Back in class, I picked it up and watched it with great interest, thinking: If only there were more such activities!
Everyone has a small pit on his stomach. Because it looks like eyes, people call it "belly button eye". Have you noticed this little navel? Have you ever hated that this pit is ugly? I didn't like it before, but now I know its history and don't want to be ungrateful anymore.
When we were still in our mother's belly, we had this navel, but at that time, there was an umbilical cord to help us transport food. We are like prisoners in a prison, waiting for the jailer to deliver something, and this jailer is the umbilical cord. Although we all had mouths at that time, we could not eat. At that time, if we really didn't eat, we would "starve to death", which we now call "because our umbilical cord is connected with our mother, which helps us to send nutrition to our stomachs." That umbilical cord is like a grass stalk, which sends nutrition to our stomachs and makes us grow in our mothers' stomachs. But why is our umbilical cord missing now? Only a bare belly button is left. It turns out that we were cut off by the doctor when we were born, because he was useless. You can't get out without cutting it off.
From now on, I think my navel is no longer ugly.
Today, my mother bought me a popular science book about animals.
Before human beings appeared, the earth was ruled by a group of extremely powerful creatures, who lived freely in ancient land, sea and sky. The earliest rulers of the earth were dinosaurs. When dinosaurs died out under natural conditions, the most humble mammals gradually changed greatly. After thousands of years of evolution, they have finally become prominent creatures on the earth. The long-nosed jerboa's slender tail seems to be very suitable for catching insects. In fact, the long-nosed jerboa also likes to catch snakes as food. Sometimes, some small mammals will become food in their mouths. Nicholas monkey looks very strange, with a big head, big eyes and big ears. Their orbital spacing is very narrow, and the outer drum bone is tubular. Niculu monkeys have sharp teeth that can be used to crush the shells of insects. The fossil of the Niculu monkey was found in western Europe. For hundreds of millions of years, in the process of life evolution, nature has created thousands of species. From 240 million years ago to 530 million years ago, there were many monsters living on the earth. The cruelty and strangeness of these monsters are far beyond our imagination. Although they are extinct now, fossil studies have proved that they did appear on our planet, and even stood for a while, ruthlessly striving for hegemony on the ancient earth. About 200 million years ago, mammals began to appear on the earth. These animals have fur or fluff on their skin and feed their young with milk. They are warm-blooded animals. Even if it gets cold, they can generate heat by themselves and keep their body temperature. The earliest mammals were very small animals, eating insects and watching mice. The earliest mammals laid eggs and fed their offspring with milk. This kind of animal is called monotremes.
I learned a lot from this book, and I'll talk about the rest next time!
I've always liked reading princess books. A few days ago, my aunt came back from a business trip and gave me a set of "100,000 Why" books, so I began to try to get in touch with popular science books.
I don't know if I didn't see it, but I was shocked when I saw it. It turns out that there are endless mysteries and wonders in popular science books, which attracted me at once. I turned a blind eye to "why" one by one, and suddenly became interested in scientific knowledge: why can't I drink boiled water repeatedly? Why can gas masks prevent viruses and so on? Among them, I am most interested in why washed eggs go bad easily. I took a curious look, oh! It turns out that there is a layer of colloidal substance on the surface of newborn eggs, which can block these holes in eggs. This layer of colloidal substance can be dissolved in water. So you wash the dirt of eggs with water, and you wash the jelly together. In this way, the small hole in the eggshell is like an open window, through which bacteria enter, so the egg will soon go bad.
It turns out that there are so many "why" in life that I don't know, but I never care. Today's reading opened a door to scientific inquiry for me. Because there are endless "why" waiting for us to discover and explore. So now we should study hard, think hard and ask questions well, so as to provide first-class technology for mankind and benefit everyone in the future.
I like this book very much, because it makes me understand that I should study hard and learn more new knowledge!
Primary school popular science composition 10 Yesterday, the teacher took us to the gym to see an interesting popular science exhibition.
Walking into the gymnasium, I saw many strange sights. Hey, what's that? A faucet has been running out of water, but there is no water pipe connector. Only when I saw the introduction did I know that there was a transparent water pipe hidden in the water. Ah! It turns out that the water pipe is the water in the water supply faucet. This is the so-called "passive water".
My favorite is a mirage. I stood a meter away and looked ahead. There is a spring hanging in the air. I reached out to touch curiously, but I couldn't touch anything. That's a mirage!
I saw another big screen. There are many strange patterns on it. The most striking thing is that there are two people on a big head. It says below that this painting has nine faces. It is said that all they found were IQ 180. I am curious to see that () many teachers also come. Alas, I only found three faces. Our Chinese teacher Ma pointed to the back and soon found nine long faces. What a good teacher!
There are many interesting things. I stopped, talking and laughing all the way, watching my classmates touch the big microphone with their hands. Listen to the students playing the electronic piano "Mi Duo Mi"; Feeling the laughter of my classmates, I really gained a lot.
Reluctantly left, I think the progress of science is really fast, and it fascinates me more and more. Also let us know that some things should not be too superstitious. We should believe in science, which can lead us to explore many unknown secrets.
I think this popular science exhibition is very meaningful.