I have loved science since I was a child, because science can achieve everything:
Science can invent "sonic running shoes". As long as you can wear these shoes, your running speed can be increased by 10,000 times. If I am at home, it only takes a few seconds to get to the park; If I am in Lhasa, it only takes a few minutes to go home.
Science can invent "fully automatic computer". This kind of computer can float in the air, which is convenient to carry around and can be touched. As long as I say QQ, all QQ numbers will appear on the computer. This kind of computer will emit air conditioning in midsummer; If it is in the middle of winter, it will emit heat energy; If it is in spring or autumn, it will give off fragrance.
Science can invent "automatic robots". This robot can cook, cook, wash clothes and so on. But its best function is cooking. The dishes it cooks are more delicious than those cooked by five-star chefs.
Science can invent "war-class sports cars". Such a sports car runs at 100 million kilometers per hour, so people don't have to be late for work. The most unexpected thing about this sports car is that it can run on the road, swim in the water and fly in the sky. It's really complete
Although these things have not been invented yet, I believe there will be a bright future!
What is science? Science is a quiet process for human beings to explore an infinite external objective existence and objective laws with the limited cognitive ability of each generation. The range of human knowledge, from the sun, moon and stars to dust microorganisms, is inseparable from science.
At present, the role of science in economic and social development is increasingly prominent, and a new day and a new month have appeared in the lives of ordinary people. Science and technology have also become the most proud technology in China. "People don't think when they meet, people don't think when they think, and pedestrians don't walk." As an advanced animal, the biggest difference between human beings and all low-level animals is that they can think. Obviously, the opposite of thinking always requires people to believe in unity, which is probably why. As a result, pseudoscience, pseudoscience and even various feudal superstitions have been able to steal the name of science in China for quite some time, and even dusty, making the whole China full of smog.
Despite all these years. The country has always advocated scientific thinking, but some people may not understand it very well. Science is a knowledge system that reflects the objective laws of nature, society and thought. Many times, many people stay at the level of literal slogans, but no one who advocates science will stay at a slogan. They can be ahead of others in all fields of human material civilization. We should see the rapid development of science and technology in China in recent years. We are all big countries in the world with "two bombs and one satellite and manned space flight". We have entered the 2 1 century, and the world's new technology has developed more rapidly. We need a solid scientific foundation and strong technical support more than ever before. Of course, the scientific basis is not to make people think, to be whimsical and to run amok. We should see that objective, empirical and practical tests are indispensable in scientific activities. Science is a treasure to explore all the sources of innovation in the world. Science despises all darkness, all fraud, all behind-the-scenes intrigue, secret manipulation and all "black-box operations" disguised as authority, power, or various gods and superstitions.
However, in order to stimulate and stimulate people's innovative ideas and activities as a whole, we should not only vigorously carry forward scientific ideas and advocate scientific spirit, but also severely crack down on superstitious activities that persecute people's lives under the pretext of "development". We should also realize the truth of science from our daily life experience, so as to understand that science is not boring, but full of fun. We should also know that science is the pillar of the development of human society. If it collapses, the consequences will be unimaginable.
Therefore, at the beginning of the new century, we should be more conscious and work harder to create and welcome a new China full of openness, fairness, justice, innovation and vitality with the concept of scientific and technological innovation and a more open mind.
Recently, I visited the Science and Technology Museum of Hebei Province. The Science and Technology Museum has several exhibition areas: power and machinery, electricity and magnetism, mathematics, Hebei scholars, universe and aerospace, sound and light, applied technology, life and health, etc. The visit to the Science and Technology Museum opened my eyes. I learned a lot of scientific knowledge, felt the infinite charm of science, felt the convenience and changes brought by science and technology to our lives, and let us enjoy the happiness brought by science and technology.
In the "electricity and magnetism" exhibition area, I enjoyed the wonderful performance of "playing with robots". The beautiful music played by robots is similar to the music played by piano master in our real life, which makes me feel the magic and shock of science. I also participated in interactive projects such as "Magnetoelectric Gallery", "Strange Wheelbarrow" and "Special-shaped Gear", which made me feel that science is really wonderful.
Science and technology are an indispensable part of our daily life. It has greatly promoted the development and progress of our society and brought about earth-shaking changes in our lives. Science is everywhere around us.
For example, why can't microwave ovens heat food with metal utensils? Because transparent things like glass can let microwaves penetrate, but metals can't. Microwave will reflect back when it touches metal. Not only can it not heat food, but it will also burn electrical appliances and eventually damage them. If we can't operate household appliances scientifically, unimaginable consequences will occur, so understanding scientific knowledge will bring us a safe and convenient life.
And why can the pulsator washing machine wash clothes? The reason is to use the power of impeller rotation to drive the water flow and push the clothes to rub the bucket wall to wash clothes. The drum washing machine rotates clothes up and down, left and right by clockwise and counterclockwise rotation, so that laundry detergent can penetrate into clothes more effectively to wash clothes. It is also a washing machine, but the principle is different.
There is a lot of scientific knowledge around, for example, at the same temperature, frozen pork thaws faster in water than in air; Nails that burn in water cool faster than those in air at the same temperature; A cup filled with boiling water cools faster when immersed in water than when immersed in air at the same temperature. All the above scientific phenomena show that water has better heat transfer performance than air.
Science brings us endless surprises. For example, people's genetic engineering through scientific research is an achievement. The greatest advantage of genetic engineering is that it can cure diseases. It can cure minor colds and life-threatening cancers, thus achieving the purpose of prevention and treatment.
Science around us is everywhere, and science around us is inseparable. In short, learn scientific knowledge well, have fun from science, study, love and use science happily, arm your mind with science, make yourself smarter, enrich our lives with scientific knowledge, and make our lives more colorful. Let's experience the happiness that science brings to our lives!
I have an ideal that is easy to say but complicated and difficult to realize, and that is to be a scientist. It has changed and shaken, but I still hold it firmly in my heart.
The idea came to my mind when I first learned to read. Sitting in the yard, I saw the rain dripping down the eaves and gradually disappearing into the ground, so I began to think about why. Instead of telling my family and friends, I chose someone to draw this picture on paper and stare at the stick figure whenever I have time. Later, I saw more and more things and accumulated more and more problems.
Problems always need to be studied slowly. Every time I see something, as long as I can't tell the reason immediately, I will write it down in my notebook and try my best to understand it. Some questions that others think are naive will become part of my problem notes. But I also have self-knowledge, and what I am doing now can only be regarded as a stepping stone on the ideal road. For the future, I also have a plan to master all the knowledge and keep it in my mind; Go out and have a look, after all, seeing is believing; Try to find like-minded friends and accomplish distant dreams together. This will be my first step as a scientist.
I have always believed that a life without an ideal is like wandering endlessly in a maze. And for the sake of ideals, the lost time is very valuable.
Last science class, when I approached the science classroom with an onion and a knife, I saw at a glance that there were more than a dozen microscopes behind the classroom. I can't help thinking: there is a microscope in the classroom, and we are allowed to bring onions and knives. Isn't it,,,,
Sure enough, this lesson wants everyone to observe the cell structure on the surface of onion. The teacher asked us to make specimens first, and my deskmate Gu Lina and I did as the teacher said: I carefully peeled off a thin layer of onion skin with a knife, then Gu Lina dropped a drop of water on the glass slide, and I carefully laid the onion skin flat on the dripping glass slide. Finally, the teacher gave us a cover glass for us to cover. This cover glass looks fragile, as if it would break with a little force. We, like the empress dowager, are cautious and quiet, and dare not neglect. Finally, the cover glass safely "settled" on the onion skin, and we were relieved.
Next is a very important step-adjusting the microscope. I gently took off the lid and put it on the table. Then, adjust the rearview mirror. We carefully moved the mirror bit by bit until we saw a very dazzling white bright spot. Finally, after putting the slide in place, I took a closer look: under the microscope, the onion skin became very big. Hexagonal blocks are combined together with a big bubble on the side! Haven't finished reading, was pushed aside by Lina Gu. As she watched it, she said, "Let me see, you go."
This scientific experiment is not only interesting, but also shows us something we have never seen before. Really very rewarding!
Sixth grade scientific composition 6 sixth grade narrative composition: man and science
The development of mankind is inseparable from science, and the development of science is also inseparable from mankind; But everything is not perfect, and there are advantages and disadvantages. The development of science is like a double-edged sword, which has changed mankind and even the whole earth. Let's take a look at the advantages and disadvantages of scientific development to human beings and nature!
With the development of science, human life has undergone earth-shaking changes and become more comfortable and convenient. But at the same time, its negative impact should not be underestimated. For example, cars can save time and facilitate travel, but also make people's physical function gradually deteriorate due to lack of exercise, and the exhaust gas generated by cars will also destroy the ozone layer and pollute the air; Although the appearance of TV and computer can make people know information without leaving home, it also reduces the communication between people and makes medicine more advanced and developed. But because people abuse antibiotics, the resistance of bacteria to drugs is getting stronger and stronger, and one day, the invasion of bacteria will become unstoppable.
While enjoying the new life of science and technology, have humans ever thought about a series of ecological disasters caused by it? According to scientists' statistics, 23% of the world's arable land is seriously degraded, 50% of rivers and rivers are reduced or polluted, 25% of mammals and 12% of birds are endangered,14 of human diseases are related to environmental degradation,13 of the land is facing desertification, and 80 countries are seriously short of water, 65438. The above-mentioned environmental problems are precisely the evil consequences caused by human beings, and these figures increase rapidly at an alarming rate every year.
The once beautiful earth, beautiful lakes and mountains, endless rivers, vast and spectacular virgin forests, crystal-clear lakes ... all these things no longer exist, and the culprit causing this serious consequence is human beings. The kind and beautiful Mother Earth created human beings to make the whole nature full of vitality and harmony, but we let her down too much and even broke her heart. If mankind continues, the consequences will be unimaginable! Shouldn't we be responsible for the consequences we have caused? Should we continue to harm nature? Will we continue to hurt our mother earth? No, we should take immediate action to remedy what we have done before. You should know: "being kind to the earth means being kind to yourself, and saving the earth means saving the future;" There is only one home, and the earth cannot be cloned! Act now before it's too late! "
There is a saying: "Science and technology change history, and knowledge changes destiny. When we enter the 2 1 century, we are entering a high-tech era. The progress of a country depends on the development of science and technology. " But at the same time, we should grasp the double-edged sword of science and technology to make human life better and more comfortable, and at the same time, we should avoid it from "hurting" nature. In fact, the development of science is beneficial and harmless. As long as we master it well, then human beings and nature will go hand in hand. The effects will complement each other.
My mother is a middle school chemistry teacher and may be influenced by her. I like doing small scientific experiments since I was a child. I remember when I was in grade one, my mother bought me a copy of Children's Science Experiment 100 Case. I have been reading books all day and have done many interesting experiments!
On Sunday, after finishing my homework, I picked up the book Children's Science Experiment 100 Cases and looked through it. Suddenly, several big characters came into my eyes: "homemade rain doll". "ah!" I cried with joy and immediately danced with joy. Yes, do this little experiment!
I first found a plastic doll according to the requirements in the book and washed its body with soapy water. With the help of my mother, I made a white dress for the doll. Next, we need to find a chemical called diamond dioxide, which happens to be some at home. I pour a little diamond dioxide into the beaker, then add distilled water and stir well until the solution is pink. I soaked the white skirt in the solution for a while and took it out to dry. I put the finished skirt on Wagui and on the windowsill, but I tried it for a few days. Although the weather has changed, the skirt has not changed color. Why? Oh, the reason is found, because the skirt is not dry but dry, no wonder it doesn't change color! Failure is the mother of success, and I am determined to do it again.
My mother and I made a white dress for the doll as it is, soaked it in diamond dioxide solution for a few minutes, and then took it out and put it on a plastic plate to dry. Gradually, the skirt turned light blue. I looked at the weather, and it was sunny. I dressed the doll and put it on the windowsill. The next morning, I first ran to see the weather, well, cloudy, and then looked at the skirt, which turned pink. "It worked! Success! " I jumped for joy.
Why does the skirt change color? Is it magic? Mother said, "Diamond dioxide is a chemical substance, which contains pink and blue pigments." When the air is wet on cloudy days, the diamond dioxide absorbs water, and the blue color is rejected, so the color turns red. On sunny days, the air is dry, the water evaporates, and the red color is eliminated, so the color becomes blue. "I looked at the small production and couldn't help but blurt out:" How mysterious science is! "
I benefited a lot from this little scientific experiment. I think: No matter what you do, as long as you have perseverance and are good at thinking, you will certainly succeed.
That day, I took some ice cubes out of the freezer and wanted to put them in my drink.
Inadvertently, my elbow knocked over the salt pot, and the spilled salt got on the ice that had just been taken out. "Oh, what a nuisance!" Just when I was frowning to clean up the spilled salt, I suddenly found that one of the ice cubes with salt had melted into a pool of water! I looked at the other ice cubes curiously: they only melted a little. Even in hot summer, when you are indoors, the ice won't melt so fast. Comparing the two, I began to guess: will the melting of ice be related to salt? I sprinkled some salt on another piece of ice. As expected, the ice melted quickly.
There must be a scientific principle! It's no coincidence. I thought so, and opened an encyclopedia at home. The above explanation confirms my hypothesis: indeed, because salt molecules can prevent the formation of ice crystals, salt can accelerate the process of ice melting, so that the salted ice can quickly melt into water. I suddenly realized that I was attracted by this principle and turned on the computer to try to get more knowledge.
In addition to what I read in books, I also learned that when water contains salt, it needs a temperature below 0℃ to solidify, which is why seawater will not freeze below 0℃. This phenomenon is called "freezing point lowering". There are many icebergs floating on the sea near the poles of the earth. They can condense into ice because the water in them contains only a small amount of salt, which is equivalent to the condensation of fresh water. Therefore, the icebergs at the poles are the largest storage places of fresh water resources on earth!
There is science everywhere in life! Because of a small mistake, I learned an important scientific principle. I believe that as long as you are good at discovery and brave in exploration, you will always gain a lot!
On Sunday, I couldn't help sighing when I saw my father's dusty leather shoes. "Well, it seems that I should be a coolie again." Why did I pick up my father's dusty leather shoes and polish them carefully to reproduce my youth? I'm not confused. "
So I found a new pair of shoes to compare with the old ones. I first touched the uppers of two pairs of leather shoes and found that the surface of the new shoes was smoother than the old ones. After the old leather shoes are painted with shoe polish, careful observation shows that although they are much brighter, they are still not as good as the new ones. Is there a relationship between the brightness and smoothness of leather shoes?
I went to get a pair of old leather shoes, which looked uneven under a magnifying glass. Then I applied shoe polish to the rough areas 1 and 2 of the leather shoes, and wiped them carefully. The area 2 was not applied as a blank control. I found that the surface of 1 area is obviously smoother after wiping and brighter than that of area 2 in the sun. Why is there such a big difference between them?
So I went to ask my father that the surface of leather shoes is not absolutely smooth. If they are old leather shoes, they are even more uneven, so that they can't reflect light in a certain direction and look dim. And some small particles in shoe polish just fill the pits of leather shoes. If cloth shoe polish is used to make it more uniform, the surface of leather shoes will be smoother and more reflective.
Through the experiment, I finally know the secret of shoes getting brighter and brighter!