Selected works of popular science among teenagers

Seven selected works on popular science among teenagers

Science and technology is a symbol, representing the primary productive force, enabling people to create a better life and leading us to explore the future and pursue Excellence. I will bring you an anthology of popular science articles for young people. I hope you like them.

On a Sunday in mid-August, after the continuous drizzle moistened everything, the sun smiled again, birds sang happily, and plants dripped dew, as if praising the drizzle. Chinese rose flowers on both sides of the road, red flowers stand on the green branches and leaves, and the sun is floating on the colorful flowers. On such a beautiful day, my mother and I visited the China Science and Technology Museum.

China Science and Technology Museum is located in Beijing North Third Ring Road. It is made of red bricks and has three floors. There is also a silver circular building next to the China Science and Technology Museum, which is the famous "Variable Screen Cinema".

My mother and I first came to the "experimental field" on the second floor. At this time, the experiment has just begun, only to see the instructor aunt take out an alloy bud and take out a hair dryer to heat the bud, only to see the bud slowly blooming. Turn off the hair dryer. When the temperature drops, the blooming buds gradually close again. The commentator's aunt said that this phenomenon is called two-way memory.

The commentator's aunt picked up a spring made of another alloy material. A fluffy duckling is tied to one end of the spring. She asked a child to hold a fluffy duck, and then heated the spring, which gradually straightened and became a straight wire. When the temperature drops, the spring is still straight and cannot return to its original position. Only by heating again can the spring shrink back to its original position bit by bit. This phenomenon is called one-way memory.

After explanation, I know that this material is very useful, for example, it is often used in hotel fireworks alarm devices. The third experiment is "faraday cage". There is a big iron cage with insulation board, on which people can stand and be isolated from the ground. Aunt commentator invited two uncles into the cage and closed the door. At this time, she pressed the power switch and the cage was charged. She told everyone that the voltage of the cage was 50,000 volts at this time. Wow! People are worried about people in cages, but people in cages are not in danger. They even dare to touch the cage with their hands Dare outsiders touch the cage? The narrator's aunt said she didn't dare to take the risk. She brought a long pole with a piece of wire at the top. She touched the cage with the top of the pole and only saw a blue electric spark and a click. It's really scary Why? The commentator's aunt told us: This is because the people in the cage are standing on the insulation board, and the voltage at any part of them is 50,000 volts. The voltage in the cage is 50,000 volts, and the voltage is zero. People outside are standing on the ground, and the ground voltage is zero. The voltage of the cage is 50 thousand volts, so people outside must never touch the cage. This experiment also told me a truth-children are not easy to move electricity, because their eyes are invisible without electricity.

After watching the experimental performance, I watched Wonderful Water Drops, Submarines, Soap Chips, Photo Wall and Are You or Me, which made me learn a lot of scientific knowledge.

China Science and Technology Museum, you are like a book, let people learn scientific knowledge; You are like a huge picture, showing people today's science. I praise you-China Science and Technology Museum!

With the development of science and technology, there is a shadow of science around us, which is always with us and helps us solve some problems in our lives. It can be seen that science is still very important to us. Some people may ask: What is science? I think science has not been discovered yet, and we need to discover, study and discuss it. But I think the most important thing is the help that science brings to people and how people find and use it. In fact, science is all around us. As long as we pay attention, I think you may be the future "Einstein".

It happened during the summer vacation. During the summer vacation, the weather is particularly hot. Even my dog often sticks out his tongue, as if to say, "It's hot, it's hot …" Because of the hot weather, mosquitoes are going to show their talents. When it comes to mosquitoes, no one doesn't hate them and call them "vampires". Yes, every evening, mosquitoes often attack us in droves, and sometimes even disturb us to sleep all night. Who doesn't hate such vampires? Strangely, we have a wonderful feeling about mosquitoes. But don't get me wrong, this wonderful feeling is by no means a love for mosquitoes, but a scientific interest. As far as I know about the living habits of mosquitoes, I find that their activities are closely related to weather changes.

Everyone has this experience! In summer and autumn, mosquitoes are extremely active before the rainy season, just as people often say, "Today mosquitoes bite people fiercely, and a rainy season is reliable." Others often say: "There are more mosquitoes in July and a half, fewer mosquitoes in August and a half, and mosquitoes bite stone balls in September and a half." So why is this? It turns out that mosquitoes are very sensitive to changes in the surrounding electric field. Under normal circumstances, the surrounding air is negatively charged, and the cloud and rain area is positively charged. When a thunderstorm appeared in the nearby sky and gradually moved towards me, mosquitoes quickly felt the change of the surrounding electric field, so the thunderstorm came soon, so they tried their best to bite and suck blood before the thunderstorm to make their eggs mature, and just laid eggs after the heavy rain.

People's diet is also important. For example, it is not advisable to have a cup of tea after a meal. Many people have the habit of drinking tea after leaving their jobs, which is actually not desirable. Because just after eating, the stomach is full of food, and the gastric juice is secreted vigorously. A large number of tea leaves enter the stomach, which will dilute the gastric juice and affect digestion. At the same time, it also increases the burden on the stomach and abdominal pressure, which is not good for the heart. Experts from Georgia Medical College pointed out that drinking strong tea after meals is even more unfavorable. Because tea contains caffeine and tannin, the former will excite nerves and cause insomnia; The latter combines with protein in food in the stomach, which will form indigestible solidified substances, affecting protein's digestion and absorption, and so on.

There were many such examples at that time, but we didn't find them. I believe that in the near future, science will become our necessity, and we will always use it.

Selected Works of Popular Science for Teenagers 3 Hua 'an County is beautiful homeland where I live. The trees on both sides of the artificial lake in Jiulong River are lush, the river is so green, and the blue sky, white clouds, houses and green trees are reflected on the river like a beautiful picture. The beautiful Hua 'an is permeated with a harmonious atmosphere everywhere.

In the community.

The grass in the community is green and the unknown flowers are beautiful and clean. Children go to school happily in groups of three and five with schoolbags on their backs; After school, I would hum a song or talk and laugh and skip home like a rabbit. After the children finish their homework, they get together to play hide-and-seek, ride bicycles, play football and other games. My brothers and sisters sometimes invite us to skate, skateboard and watch colorful lanterns to form a colorful dragon. Let's laugh and cheer, not to mention how happy we are!

Next to the waiting station

Everyone waited patiently for the arrival of the bus, but the fierce sunshine left sweat on people's faces. Finally, the car stopped and everyone crowded in the direction where it stopped. 1 of "brush", the door opened and people got on in turn. Hot weather is inevitably annoying, but no one cuts in line or pushes me. When I got on the bus, there were no seats left. At this time, a little brother warmly greeted: "Brother, come and sit with me!" " "My little brother and I smiled at one another and crowded together. The car went on. After a while, another grandmother came up and several young people offered their seats. Grandma's face is filled with a gratified smile. What a beautiful and harmonious picture this is.

Artificial lakeside

As night falls and the lights are on, the Jiulong River becomes a sea of lights, which is even more beautiful. Trees on both sides put on bright new clothes, strings of colorful lanterns are confusing, and neon lights on high buildings are flashing, reflecting on the lake like stars all over the sky. The new bridge built on the artificial lake, like a rainbow, connects the north and south banks, adding a lot of charm to the artificial lake. When people are full, they come to the lake for a walk, either scurrying or walking slowly. It's so cozy, and the cool breeze gently caresses their faces, which makes people feel refreshed. Tired of walking, you can take a nap on the bench on the shore and enjoy the peace of the night. Young parents are holding their toddlers with smiles on their faces. Look at the pavilion by the lake. Old people in twos and threes are laughing and recalling the past. Hearing their hearty laughter, it seems to be back to youth. How happy this scene is.

A harmonious home is beautiful, civilized and warm. I love my home.

Young people's popular science anthology 4 little reporters have activities again. This week, we will go to the youth science and technology activity center-the city exhibition hall to participate in a large-scale popular science spring outing. /kloc-On the morning of April, 2007, my sister and I put on the waistcoat of the little reporter early and set off excitedly, thinking that we could get in close contact with giant snakes, giant turtles, lizards and so on, and experience the magical stereoscopic vision charm of 3D and 4D movies for free. At 9 o'clock, we arrived at the entrance of the exhibition hall on time, and I saw someone wearing a bright red vest.

The little reporters have already arrived.

While waiting for the reporter to sell tickets, our little reporter chattered excitedly ... Ah, we can finally go in and can't wait to go in. Just as we entered the door, a big brother gave us a pair of stereo glasses, which were still free. It's really good. It seems that it is good to be a small reporter. We went to the movies first, but there were so many people there that we couldn't see them. We have no choice but to see animals. I saw the giant turtle and lizard, a century-old turtle, didn't I? At first glance, really, I quickly took a picture with my camera. One hundred-year-old turtles shrank their heads like fear, and only one stuck out its head as if to say, "Who are you? Why are there so many people?" Seeing such an old turtle for the first time, I also understand why turtles are often called shrinking turtles, because they always shrink their heads inside. Isn't it interesting? The lizard, on the other hand, stood motionless beside the branch and looked fake.

Then, we went to Magic Island and got a set of exquisite Liu Qian magic props for free. I really envy Liu Qian's skillful magic performance, but I can't learn it, so I thought about it at that time; Magic is too difficult to learn! So I looked at it carefully, and slowly I saw something, and I knew a little, so I thought, is it hard? It seems that you have to do everything with your heart. Walking, I suddenly saw a lot of people around me. I was very curious and immediately squeezed in to see it. Wow, it turns out that Pleasant Goat and Big Big Wolf, which I've been waiting for for a long time, are too powerful. Everything there is very strange, and the garbage has been modified several times.

Time flies so fast that we forget all the time. When we reluctantly walked out of the exhibition hall, we were still wanting more. Today's weather is really good, just like my happy mood. Popular science spring outing brought me closer to science and understood the mystery of science. I really hope to sow the seeds of exploring science in everyone's heart.

Science is closely related to life, and many magical phenomena in life can be explained by scientific knowledge.

Don't wear white in winter and black in summer. "This is the experience that people have summed up from their life practice. Do you know the scientific truth it contains?

The natural environment we live in is colorful and beautiful, with red flowers, green grass, blue sky and white clouds ... all kinds of objects have their own colors. However, these gorgeous colors disappeared in the dark. This shows that only under the illumination of sunlight (white light) can an object appear in color. So, why do all kinds of objects have different colors under the same light source? As we all know, sunlight is a mixture of red, orange, yellow, green, blue, indigo and purple. Different objects have different absorption and reflection abilities for different colors of light. People can't see the light absorbed by objects, only the reflected light. Therefore, what color light an object can reflect, in our view, it has what color. Such as safflower, because it can only reflect red light and absorb light of other colors; White things can reflect all colors of light, so they look white; But black things can absorb all colors of light, and there is no light reflected back, so they look black. The sun not only brings people light, but also brings a lot of radiant heat. For radiant heat, black only absorbs and does not reflect, while white is just the opposite.

Generally speaking, dark things absorb more sunlight and radiant heat and reflect less; Light-colored things reflect more and absorb less. Therefore, people like to wear light-colored clothes in summer, such as white, gray, light blue and light yellow, which can reflect a lot of light and radiant heat and make people feel cool. It is best to wear black and dark blue clothes in winter. They can absorb a lot of light and radiant heat, and people naturally feel warm. When people know the laws of nature, they can use them in production technology. For example, the surfaces of large open-air gas tanks and oil tanks are painted silvery white to improve their ability to reflect sunlight and radiate heat, so that the temperature of the tanks will not rise too high, so as not to cause explosion accidents.

People also use the principles of reverse and absorption to conquer nature and make it serve mankind. There is a Qilian Mountain in the northwest of China, which is covered with snow and ice. However, because the mountains are very high and the weather is very cold, even in hot summer, strong sunlight and radiant heat are reflected back by dazzling white snow and ice, so the snow can't melt. As a result, the vast fields under the mountain were barren because of lack of water.

13 On June 3rd, the teacher came into the classroom excitedly and said to us, "This afternoon, the popular science caravan will drive into our Dong Jun primary school."

The students discussed with each other, and some said, what kind of car is this? Is it different from other cars? Others say it must be a high-tech product. We are curious about what a technology caravan is and what functions it will have.

The long-awaited moment has finally arrived. The teacher asked us to line up and walk to the playground. We hurried downstairs. On the first floor, two aunts wearing the same clothes gave us a pair of 3d glasses. The whole class wore 3d glasses, and two aunts took us to the playground. Now I understand that they are our "tour guides".

Under the guidance of my aunt, we came to the "TV" one by one. I was watching an introduction about dinosaur eggs in the movie: at present, the longest axis of dinosaur eggs discovered by scientists is 56cm, and the shortest axis is 38cm. I went to see a dinosaur movie again, and a huge dinosaur grabbed me with its sharp claws. In an instant, the cries of dinosaurs came to mind. It took me a few seconds to react. The instructor's aunt told us: "The largest dinosaur fossil discovered by human beings is as heavy as 20 elephants. Whales are much smaller than this dinosaur, but the smallest dinosaur is only as big as pigeons." It seems unbelievable

After watching it, we took off our 3d glasses. I was surprised to find that the film I just saw turned out to be a painting. I can't help sighing in my heart: technology is really amazing. Then, my aunt led us to visit "solar power generation", "visible sound waves", "handstand", "invisible force" and "flying bowl" ... This time we visited the "popular science caravan", which fully showed us scientific principles such as mathematics, optics and electromagnetism. It really opened my eyes!

The caravan of science and technology introduced us to many scientific discoveries and truths. I believe that the caravan of popular science will definitely enter the rural and mountainous areas, so that more children in rural and mountainous areas can experience the development and magic of science and technology. Broaden our horizons, enrich our knowledge and ignite our yearning and love for science.

My article mainly focuses on the speed of scientific and technological development, the influence of popular science caravan on primary school students, and letting primary school students watch rare animals such as dinosaurs at close range.

Selected Works of Popular Science for Teenagers 7 Ink is used for writing. However, it is difficult to eliminate ordinary ink after writing, which hinders the recycling of paper. I saw a magic ink in the column "I love inventing" today.

According to Professor Dong Chuan, the inventor of this ink, "The magic of this ink is that it will disappear under the action of light and water after writing. Therefore, we named this ink' Fashion Ink'. " The reporter is a little incredulous and is going to do an experiment to verify Professor Dong's ink.

The reporter prepared three kinds of paper: printing paper, writing paper and newspaper. First of all, the reporter wrote and painted on the printing paper with easy-to-fade ink, ordinary watercolor pen and watercolor pigment, and then sprayed water on it with a flower watering nozzle. In less than a minute, you can clearly see that the words written in fadeable ink have changed obviously and the color has faded a lot, but it will take some time to disappear. Then, the reporter wrote on stationery and newspapers. However, what was written on the stationery did not disappear. Professor Dong explained: "Because the fibers used to make all kinds of paper are different, and the penetration degree of this ink is different from that of all kinds of paper, the fibers and ink of stationery like this have strong penetration, so it takes a long time." Then I read the newspaper, and the result was greatly unexpected. The words in the newspaper disappeared as soon as they touched the water. Looking at the three pieces of paper together, the words written by Professor Dong in ink are almost invisible, but there are still some traces.

To this end, Professor Dong invented another kind of paper. In fact, this kind of paper is nothing special, just covering ordinary paper with a plastic film. Write on it with faded ink. Wipe it with a wet cloth, and there is no trace at all. Wipe it gently and the trace on the cloth will be gone.

Although this kind of ink can improve the utilization rate of waste paper, it will disappear when it touches water. If it is a roll paper for examination, it will be bad. In order to perfect this kind of ink, Professor Dong invented another kind of ink which can be dissolved in boiling water. Later, the reporter started the experiment again.

There are two pots heating on the table. After the water boiled, the reporter put the ordinary printed printing paper in one pot and the paper with ink invented by Professor Dong in another pot. The water temperature rises slowly. When the water temperature reaches 50℃, you can see that the ink characters have disappeared, the water has not changed, and the ordinary printing paper has not changed.

It's amazing! I hope this kind of ink can be widely used in our daily life in the future, which will greatly reduce the waste of paper.