I have a dream: I hope people all over the world can care for the environment, protect the ecological balance of the earth and make our earth more beautiful.
You see, in the streets, markets and parks, you can always see flying plastic bags, wrapping paper, bamboo sticks with spicy kebabs and billboards. Although sanitation workers keep cleaning and picking up, some people turn a blind eye to the garbage bins not far away and throw them around. Around us, there are countless examples of littering, cutting down trees, air pollution and water pollution. All these make our living environment worse and worse, and the quality of life drops rapidly. How can you feel comfortable living in such an environment?
So, when I grow up, I want to be an environmental scientist, specializing in resource utilization and regeneration. We should invent all kinds of environmental protection products, purify water and air, recycle all kinds of garbage efficiently, and reuse all kinds of resources to greatly improve and improve our living environment. We also want to be an environmental protection ambassador and travel around the world, so that everyone can take action, remove garbage, form a good habit of hygiene, make environmental protection deeply rooted in people's hearts, make our environment better, and raise our quality of life to a higher level.
It is my dream and my lifelong pursuit to contribute to environmental protection. I hope my dream can come true as soon as possible, so that our earth tree will be greener, flowers will be redder and birds will sing more melodiously.
If I were a scientist, I would invent an inflatable car. This kind of car is very soft, even if it hits someone, it's okay, just like someone hitting a sofa. In this way, there will be no "car crash" caused by car accidents.
If I were a scientist, I would build a house that can be underwater. It is built in shallow water, and the whole house is transparent, allowing sunlight to come in. There is also a robot in it, relying on light energy, so that you won't be too busy to clean the room. There are two balconies, a master bedroom, a living room, a baby room and a guest room, a kitchen and a baby room.
There is a green cupboard in the kitchen, with buttons in seven colors: red, orange, yellow, green, blue and purple. Red is cooking. When you press it, delicious rice will appear before your eyes. Oranges are juice; Yellow is fruit; Green and cyan are; Cyan is a dish; Purple is for cooking for yourself.
If you want to go out, there is a submarine at home. Its speed reaches 500 kilometers per hour and it runs automatically. If you're bored,
Then turn around and you will find a computer. If you enter the name of a book, it will "spit" out from a small hole below.
If this underwater house is successfully built, it can reduce the loss of forests and save tens of millions of acres of land.
If I were a scientist. ......
In this so-called injury-free era and materialistic society, we are more and more eager to pursue that initial emotion, that simple smile, and recall that long dream with a cool and peaceful heart, which is our childhood that we can't go back to! But it didn't alleviate my yearning. Your face appeared in my mind, and I can't forget it for a long time. Where is the value? The distance between reality and heart, so far apart? In other words, we are still alive, which is the fundamental reason why we continue to live, and the essence of our desperate struggle is that we don't want to be blindfolded and die nameless.
I like science since I was a child.
Science can invent multifunctional chopsticks. This pair of chopsticks is empty in the middle. As long as the head and tail are pulled apart, it becomes a straw and can be used to drink water. There are four buttons on it Press the first button, the chopstick head will immediately become a knife, which can be used to cut things. Press the second button to become a fork, which can be used to eat noodles; Press the third button to become a spoon, which can be used to drink soup; Press the fourth key to change back to the original chopsticks, which can be used for eating.
Science can invent magic shoes. Shoes are automatically controlled by the bioelectric current of the human body. When the brain sends a signal to direct the foot to move in which direction, the bioelectric current of the brain is quickly transmitted to the foot through the nervous system. These shoes don't need to consume other energy. It can store the energy that the wearer usually walks, and it will be released once needed. You should loosen your shoelaces when you don't wear them at ordinary times, so it is no different from ordinary shoes. When you need it to run fast, just tie your shoelaces, and it becomes a veritable magic shoe.
Science can invent smart dustbins. It can distinguish different colors and different materials. It has a rectangular mouth with a red button at the top and four trash cans below. If you throw the slider into the big mouth of the smart trash can and press the red button, the box will make a rustling sound, that is, it is automatically sorting garbage. If it is ordinary garbage, it will fall into the first trash can. If it is plastic garbage, it will fall into the second trash can, if it is metal garbage, it will fall into the third trash can, and if it is dangerous garbage, it will automatically fall into the fourth trash can. People recycle according to the classified garbage, and plastic garbage can be recycled after treatment; Metal scrap can also be re-made into products; Hazardous waste can be changed from harmful to harmless through biochemical treatment.
Although these objects have not been made, I believe they will be made in the future world. This is the wisdom that science brings to mankind.
As early as the May 4th Movement, pioneers shouted the declaration of "advocating science and opposing ignorance". From a realistic point of view, economic prosperity cannot automatically stop the spread of ignorance and superstition. It is still a long way to go to improve the scientific and cultural quality of the people and fight ignorance. To improve the public's scientific literacy and form a good fashion of "being proud of advocating science and being ashamed of ignorance" requires the joint efforts of the whole society. For example, scientists should adhere to the scientific spirit, abide by scientific ethics, and maintain the seriousness, rigor and standardization of science. Take a serious study and scientific verification attitude towards the hypothesis that has not been scientifically proved; We must resolutely oppose acts of violating basic scientific facts and laws, practicing fraud, and marching around the city in the name of "science." As leading cadres and management workers, we should clearly adhere to scientific truth, support scientific experiments and free discussion of scientific issues, and support the struggle against superstition, ignorance and pseudo-scientific activities. As news publishing and mass media workers, we should guide the broad masses to choose a healthy, civilized and scientific lifestyle, rather than providing a carrier for the spread of ignorance and so on.
According to the Survey Report on the Current Situation of Popular Science in China completed by experts from Chinese Academy of Sciences and other institutions last year, at present, two people in China 1 are superstitious about seeking visas; Of the 4 people, 1 person is superstitious about constellations; Of the five people, 1 is superstitious about Duke Zhou. In 20xx, the proportion of China public's scientific literacy to individual literacy was only 1. 98% of the 50 people in China have only a basic scientific literacy, which is about twenty or thirty years behind the developed countries.
Proud of advocating science and ashamed of ignorance. Scientific progress is a great source of social progress, and the modernization of a country must first be the modernization of science and technology. The five transfers of the world economic center are all driven by the transfer of science and technology centers without exception. A nation that advocates science is bound to be a nation that is constantly improving and full of vigor and vitality. The more our country develops, the more we should attach great importance to the coordinated development of social science and natural science, widely spread scientific knowledge, scientific methods, scientific ideas and scientific spirit in the whole society, and further form a good social fashion of stressing, loving, learning and using science.
Do you know toothpicks? Do you know how toothpicks let us know about science? Only use your own observation and courage to do the experiment. Do you know balloons? Do you know static electricity? Next I will take you to discover the mystery of static electricity.
The experiment began. Let's prepare tools, toothpicks, water, sugar cubes and soap. Step 1: Carefully put the toothpick on the water. Step 2: Put the sugar cubes in a basin away from toothpicks. The toothpick will move towards the sugar cube. Step 3: Put the soap in the water and keep the toothpick away from the soap.
The next experiment begins. Tools are 2 inflatable balloons, 1 string, 1 piece of cardboard. Step 1: Inflate two balloons separately and tie a knot in your mouth. Step 2: Connect two balloons with a thread. Step 3: Erase static electricity. Step 4: Separate the two balloons. Step 5: put the cardboard between two balloons, and the electricity on the balloons makes them attracted to the cardboard.
Why? Because of static electricity. The electricity on one balloon repels the electricity on the other balloon. The electricity on the two balloons attracts them to the cardboard.
When you put the cube in the center of the basin, it will absorb some water, so there will be a small water flow in the direction of the cube, and the toothpick will move with the water flow. However, when you put soap into the basin, the surface tension at the edge of the basin is strong, so you will pull the toothpick out.
Thank you for doing the experiment with me.
During the summer vacation, my father took me swimming in the Olympic Sports Center. When I came to the swimming pool, I took off my underwear and went swimming. I swim happily. Suddenly I felt a little pain in my ear, but I felt that it was nothing serious, so I endured it and swam down for a while. Oh, no, my ear hurts again and I don't want to surface. So I asked my father, "Dad, why do I feel my ears hurt when I swim?" Dad told me, "Maybe you dive a little deep. The pressure of the water is too great for your ears, so it hurts."
So I became curious about the pressure of water and wanted to know what determines the pressure. When I got home, I flipped through "100,000 Why", and there were too few things written on it to understand. I looked up the information on the Internet and learned that the pressure of water is determined by its depth. The deeper the water, the greater the pressure, and the shallower the water, the less the pressure.
To this end, I did an experiment. The materials are: 1 rectangular vertical carton filled with milk, 1 rolled tape, 1 nail, 1 flat plate.
I put away the milk carton and poked three holes in both sides with nails. The positions of the three holes are bottom, middle and upper respectively. Then seal the three holes with adhesive tape, fill the carton with water, put the flat plate under the perforated side and tear off the adhesive tape. Do you know what happened? Is there a difference between three-hole water spraying? Of course not. The water from the bottom is sprayed farthest, followed by the water in the middle, and the water from the top is sprayed closest. This proves that the pressure of water varies with the depth of water. The deeper the water, the greater the pressure, and the shallower the water, the less the pressure. Therefore, the depth of my swimming pool is different, and the pressure felt by my ears is different.
In order to know what other factors are related to stress, I did another small experiment: I inserted a straw into the mouth of a small paper box and plugged it tightly. Then I use a straw to add water to the carton. When the water reached the suction pipe, the bottom of the small carton cracked. After many experiments, the results are the same. It turns out that water pressure is also related to weight. Because the bottom of the carton bears the maximum weight of water, the water pressure is the greatest, so the bottom of the carton cracks.
Pressure is everywhere, including water pressure and atmospheric pressure, which are closely related to our lives. The pressure is far away and close at hand!
I feel that the world is wonderful since I was a child, and I am curious about many things. For example, what does the tree "breathe"? Why do people fly away as soon as they get close to flies ... then they go to school, and now a lot of knowledge that they didn't understand before is slowly understood. In science class, I know that the "small nose" of a tree is its leaves, and the tree breathes on the leaves. In extracurricular books, I learned that flies can observe 360 degrees, so they can detect the smallest activities around them as quickly as possible. So when people get close, it will fly away immediately ... But there are still many phenomena around me that make me curious.
One day, I finished my homework and went to the balcony to see some goldfish raised by my grandfather. I brought fish food to feed the small fish, and then I lay down in front of the fish tank to watch the small fish eat. Suddenly I found out that the goldfish I saw in the water through the fish tank was much bigger than the goldfish I just saw through the water. So, I stood up again to see the fish through the water, and the little goldfish became smaller again. I was shocked and shouted, "Mom, no, the little fish has become a Transformers!" " "My mother heard me crying and ran to see it. I said to my mother anxiously, "Fish will get bigger and smaller. "After listening to my story, my mother smiled and said to me," It's not that small fish will get bigger and smaller, but that light is becoming a magical magic! ""I became more curious and asked, "How can light do magic?" So my mother found the encyclopedia and turned to the page about light. I couldn't wait to pick up the book and read it. After reading the book, I finally understand that it is really not the small goldfish that will become bigger and smaller, but the principle of light refraction: when light hits from one medium to another, the propagation direction of light changes at the interface, and some light enters the second medium. This phenomenon is called light refraction. I also learned from books that light can become other "magic". For example, when I look in the mirror, I hold it in my right hand, while when I look in the mirror, I hold it in my left hand. This is the principle of light reflection. Light can also do a lot of magic!
If there is no science in life, there will be no fun, no exploration and pursuit; The world is full of mystery, full of magic ... science is like the key to solve the mystery, and all questions need to be answered without it. We need to keep exploring in the future study in order to know more scientific mysteries.
Today, as soon as we got to the classroom, we began to have classes. But this class is really special! It turned out that Mr. Wang had two cups and a small piece of paper in his hand and said, "We are going to do an experiment today!" " "Experiment!" We cheered. After that, Mr. Wang began to do experiments.
The experiment began. Some students stood on the bench, some ran to Miss Wang, and even stood on the table! We saw that Mr. Wang poured a jar of water into the cup and buckled the paper on the mouth of the cup. Then cover the mouth of the cup with your left hand, press hard, and then cover the bottom of the cup with your right hand. Then I turned the cup over and moved my hand slowly. At this point, my heart is in my throat. I thought to myself: can this succeed? Everyone held their breath and waited for Miss Wang's "achievement". At this time, it seems that you can hear the sound of a needle falling to the ground. Suddenly, Mr. Wang let go of his left hand, and the piece of paper was washed down with a "wow" sound, and the water splashed all over the floor, and everyone burst into laughter. It turns out that Mr. Wang's paper is too small to cover the mouth of the cup, so air flows in, and the air inside and outside cancel each other out and disappear. However, Mr. Wang didn't lose heart and continued to do the experiment. Teacher Wang took another piece of paper, the same as before, but failed again this time. We laughed again. The teacher took another piece of paper, pressed it on the cup filled with water and turned it over. "Ah," we shouted. It turns out that teacher Wang succeeded. She held the cup high, and after a while, she put it down again and asked, "Why didn't the paper fall?" Later, the teacher called Zhang, and Zhang said, "Because when the paper is pressed on the cup, the air doesn't take up the position, so the paper won't fall." Teacher Wang said, "No, it's because there are things around us that are invisible and intangible. Its power is greater than water, and it is atmospheric pressure. Because we fill a cup with water, air can't get in, and then put a piece of paper on it, leaving no gap. On the contrary, the paper will not fall off. But if the water is not full, buckle a small piece of paper and the paper will be washed down. This is my second experiment. " "Oh!" We suddenly realized.
Through this experiment, I benefited a lot and learned the mysteries of nature.