According to my mother, a long time ago, there were no lights, telephones, cars and washing machines in the world ... I think people at that time should be tired, bored and inconvenient! Thanks to scientists, their inventions make our world so beautiful. Therefore, I also want to be a scientist and invent more useful things for people.
Nowadays, because of environmental pollution and people's life pressure, diseases are getting younger and younger, and many people get incurable diseases at a young age and die young. White-haired people send black-haired people, which is the sadness and pain of many parents. In addition, there are so many infectious diseases, such as SARS, hand-foot-mouth disease, type A H 1N 1 and so on. This makes many people "talk about illness and change color." If I were a scientist, I would invent a medicine, which will make people recover immediately after taking it, just as good as a cold and fever now. Besides, this medicine is very cheap and everyone can afford it.
Our parents often worry about our clothes. When the seasons change and we grow taller, we have to buy new clothes. The water is so cold in winter, but we often get dirty for fun, which makes our parents wash our clothes and our hands freeze like carrots. If I were a scientist, I would invent such a kind of clothes: it will change color and thickness with the change of seasons, and even change a style once a week, so that you won't get tired of wearing it. More importantly, it will never be dirty, lest our parents wash our clothes again.
If I were a scientist, I would invent many things that are beneficial to mankind. Of course, being a scientist is not that easy. So I will study hard and strive to realize my ideal as soon as possible.
I came to the scientist's office today and continued to invent houses that can be planted.
Can the house still be planted? Don't worry, listen to me slowly. In the past, houses not only wasted energy, but also polluted the environment, because many building materials, such as plywood and paint, were not environmentally friendly and would release various toxic and harmful substances, which were extremely harmful to human health. The kind of house removes all the disadvantages of the previous house and does not need air conditioning. Warm in winter and cool in summer, it still smells sweet. Walk in and you will be relaxed and happy.
If you want to plant this kind of house, you must first find a piece of land big enough and fat enough, and then water it with a special water fertilizer. The seeds will germinate in a few days, and after a while they will become towering trees. There are several rooms like fruits growing on this tree. Branches are corridors, and together they are a small house. And these fruits can be turned into various fruits according to your preferences, which are very beautiful.
There is a door on the suitcase. When you walk in, you will see a staircase. Go up the stairs and you will reach the living room.
This kind of house is invented. I'm going to invent a vacuum cleaner that can help people do housework automatically.
This kind of vacuum cleaner has solar panels, so it doesn't need to be recharged, which is environmentally friendly and saves money.
This is my dream when I grow up. I must realize these inventions in the future.
The assembled world is a boy's Garden of Eden, which is full of the mystery of the magic castle and the unpredictability of the misty forest. This requires imagination and logical rules. Lego star diamond, robot DIY accessories and scientific tool accessories are all amazing, which will give you a big surprise if you are not careful. Let me talk about my science conference!
What I often do is Lego assembly. When I first came into contact with Lego assembled toys, my mother was very wary of the little star diamond, fearing that I might accidentally swallow it as candy. Actually, my mother doesn't understand that I prefer these small diamonds to candy. For a time, I was fascinated by building Lego City. I added many space passages between skyscrapers, strengthened the defense of wartime tribes, and built large amusement parks in coastal towns ... one after another, time flew like a bullet. I often get carried away and immerse myself in it. I feel like a great architect in Lego world, fighting for a happy home. Some people are very enthusiastic about Lego and think it is easy to assemble Lego, as long as you follow the instructions and use the software casually.
Spelling Lego is memory and patience. With the increasing number of star diamonds, it is a very challenging thing to find the administration you want in thousands of star diamonds. In the past two years, I am very proud. In the case of more and more heavy study, I also completed the assembly of Millennium Falcon and Death Star. The real charm of Lego is to assemble it according to your own imagination. I have spelled castles, farms, railway lines, deserts, sky cities, etc. Different from the instructions. The most interesting thing is to assemble with friends and compete with two armies or three armies. My job is to turn thousands of star diamonds into vivid and interesting stories, and it feels really great!
The most popular in our family is robot DIY assembly. DIY is self-assembly. I think it is a little more difficult than Lego assembly, because there is a lot of physical knowledge. Playing this fun-loving project can get the unanimous support of parents. My first job was a robot dog. I needed wrenches, screwdrivers, vises and other tools, as well as wiring and debugging programs. It was very challenging for me when I was only 8 years old. My hands are not strong enough. Those screws are difficult to tighten. After many debugging, the puppy's four feet jumped out of harmony and fell down as soon as it started. I revised the instructions repeatedly and corrected my mistakes. When the puppy is really finished, that kind of happiness is unparalleled. After that, I think the outstanding works are six-legged car, automatic obstacle avoidance cleaning robot and physical experiment suit. I borrowed a book called Robot from the school library. There are many complicated robots in it, which are very capable. I really hope that one day I can become an engineer who makes super robots.
I think one that is very practical is the assembly of household appliances. The biggest piece of equipment I have completed so far is the astronomical telescope, which belongs to scientific tools. When I bought it from Taobao, it was a bunch of scattered lenses, brackets, screws and other parts. It was a bit difficult to read the assembly instructions, which cost me a lot of effort, and I also asked my uncle who had the same assembly experience in my circle of friends. However, it is really handsome after assembly. I took it to the balcony on the top floor for astronomical observation, and the surface of the moon I saw was uneven, which was completely different from what I saw with my naked eyes. According to the instructions, this astronomical telescope can also observe other planets and nebulae in the solar system, and can also take pictures and record them, but it needs lenses and other spare parts for assembly and upgrading. This assembly can not only learn scientific knowledge in the process of assembly, but also allow me to obtain better scientific observation records after completing my work. I also assembled daily necessities, my mother's shoe rack, my father's bookcase and my sister's little bike, all of which are my works. These labors have won full praise!
After reading so much, do you think scientific assembly is interesting? If you are interested, please join us!
I have many wishes. My greatest wish is to be a scientist. I want to make China's science and technology more developed, and I want my scientific research results to benefit mankind.
I really want to be a scientist, and then I can invent a magical potion. This potion can cure all diseases, whether it's a cold or fever, bleeding or injury, or even cancer and AIDS, it's incurable. As long as this medicine is used, the patient will recover immediately. You will never see the painful expression on the patient's face again, but you will get a happy smile and waves of happy laughter.
I really want to be a scientist, and then I can invent intelligent spacecraft. I want to sit on it, fly to the moon, see how cold it is on the moon, see how magical the osmanthus tree that can never be cut down, touch the beautiful dress on sister Chang 'e, and hug the docile and white little jade rabbit.
I really want to be a scientist, and then I can invent an intelligent road. This kind of road can be widened automatically when there are many cars and restored to its original state when there are few cars. With this road, people can travel more conveniently, the traffic in the city is smoother, and our life will be better and better.
I really want to be a scientist. I invented the purifier at that time. Hanging this purifier in the air can suck out all the waste gas and dust and make the sky bluer; Put this purifier in the water, it can make the polluted river clear again and make the fish swim more happily; Inserting this purifier into the soil can make the hard land soft and fertile, and make the dealers grow better year by year.
After becoming a scientist, I really want to ... I want to invent too many things. Please don't say I'm daydreaming. As long as we study hard now, I believe my wish will come true.
Science is often attractive, science will never be explored, and it will always be fresh and interesting. For example, taking the floating egg experiment as an example, many people may know it, but the process of doing the experiment is far more novel than what I heard.
The experiment is simple. There are only four materials: big glass, salt, spoon and eggs. Simple as it is, you can get endless knowledge from it.
First, I picked up the kettle, poured half a glass of water into the cup, and then gently put the eggs into the water. After the egg sank to the bottom of the glass, it stopped moving and seemed to be resting.
Then I put 1 tablespoon of salt, and the eggs didn't move; I began to put the second spoonful of salt, and the eggs were still lying quietly at the bottom of the cup; I put down 6 spoonfuls of salt in a rage, and the eggs didn't live up to expectations and rose a little; Finally, I put 2 spoonfuls of salt, and the index of egg rise was higher.
I heard that other people's eggs can float in the middle of water, so I took them out, stirred the semi-finished salt water with a spoon and slowly put them in until the bottom of the cup was salted. At this time, the eggs kept floating up and down. I waited for a while, but the egg did not move and struggled to surface.
Finally, I poured the remaining 2 spoonfuls of salt into the water, and the eggs gradually surfaced, like swimming freely in a swimming ring. Naughtily, I pressed the egg down with my fingers, released my fingers, and the egg quickly floated back to the water.
Why do eggs float? I got something from the computer: when an egg is just put into clean water, it will sink to the bottom because its specific gravity is greater than water and its buoyancy is less than its own weight; After salt is released, water dissolves the salt and the specific gravity of water increases. When the specific gravity of salt water is equal to that of eggs, eggs will float in the middle of water. Keep adding salt. When the specific gravity of salt water is greater than that of eggs, the eggs will float on the salt water and the top of the eggs will be exposed to the water.
The teacher told us in class that any object will be buoyed in water, and buoyancy is equal to the volume and weight of the water boiled by the object. This is the famous Archimedes principle, also known as the law of buoyancy. In fact, science and physics are similar when they grow up.
I was surprised that this little experiment contained so many theorems, which made me realize that science is of great significance to us besides relaxing and playing. I secretly made up my mind to study physics and study this interesting science in the future.
At the end of last year, near the festival, my mother bought me a daffodil. I am very happy. I put it in the basin as my mother said, then poured clean water into it and put some pebbles in the basin.
I change the water once every three or four days. My mother said that the Spring Festival would be held and the flowers would be particularly fragrant. A few days later, daffodils sprouted, much like onion seedlings. About a month later, several buds grew out of the green leaves.
The Spring Festival is coming, and those buds haven't bloomed yet. It may not know how anxious I am to see the flowers! After the Spring Festival, not only did it not bloom, but the buds withered. Mother told me that it was dead and hopeless. I'm so sad! I am determined to find out the cause of its death. So, I went to the computer to find information. It turns out that the growth of daffodils needs sunlight, and the suitable temperature is 12℃-16℃. If the water temperature is too low, daffodils will only grow leaves and will not bloom, or even die. During that time, the south was hit by a once-in-a-century heavy snow, and the temperature in our place dropped to 0 degrees Celsius, which lasted for more than ten days. I didn't take any heat preservation measures to protect the flower buds, which led to the death of daffodils. I just froze to death because of my mistake, and I regret it.
I see, it takes knowledge to raise daffodils! Although daffodils don't need any flower fertilizer, they only need water. But in order to make daffodils grow strong, they should be taken to the balcony to bask in the sun during the day. If you want to postpone the flowering period, you can lower the water temperature, not too low, 10 degrees Celsius is appropriate. In addition, if you can't see the full flower buds before the festival 10, you can use water heating to promote the flowers, and the water temperature should be close to the body temperature. With this experience of failure, I believe that a fragrant "Ling Boxian" will be raised by the end of this year.
Thursday's science class really made me angry.
Today, we learn pendulum. The science teacher made an interesting opening remarks. "Oh ~ pendulum ..." "Don't you study mechanics?" The podium suddenly exploded.
"Well ... all right. Yes, we are going to learn to swing today. " The teacher announced the truth. The representative of our group went up to get the experimental props-two nuts, a short rope and a shelf (sorry, I forgot the name). We hang the rope on the hook and put the nut on the hook. Get a stopwatch ready and start timing. The rope shook with the nut, which reminded me of the pirate ship in heaven. Hmm. Hmm? A little hypnotized. I saw Chen Xiqi counting back and forth, his hand dangling, a bit like ... "Haha, it seems to be slapping you in the face." He smiled like a demon, and the fat on his face was shaking. "Boys are really annoying!" I think. Look at the two people next to the quartet. One is playing with a pen. If I had an English class, I would have killed him (I am the representative of English students in a class)! The other is timing, not bad, he is my best friend, but the urgency makes him not only not help me, but also stand by! Anger, anger, anger
Oh ~ I seem to see hope (too exaggerated), the teacher is coming. I immediately turned back into a good girl and complained piteously to the teacher: "Teacher, Chen Xiqi hit me (because I am a representative of English students in a class, everyday speech often involves English)!" Say that finish turned to look at Chen Xiqi that embarrassing appearance. Who knows the teacher came: "Chen Xiqi is a good boy, how can he hit people?" There is a bit of sarcasm in the words. "Yes, the teacher said I was a good boy. Yes, yes! " What a thick skin! I am so angry!
Article 8 of the fourth grade scientific composition "Teacher, teacher, my desk lamp is on" and "My sweeping robot has finally started sweeping the floor". Waves of cheerful laughter echoed in the classroom, and every classmate's face was filled with the joy of success.
On the first day of winter vacation, I took part in the little Newton's scientific practice class organized by Cuiyuan Street, and went into the scientific world to observe scientific miracles and understand scientific principles. This course lasted five days. We studied science knowledge such as electricity, magnetism and lever principle, and made small desk lamps, magnetic levitation pens, boats, shooting machines and sweeping robots. Among them, my favorite is the sweeping robot.
Mr. Hu is the science teacher in our class. He is a handsome young man. In class, while playing PPT video, he tells the scientific principle and production method in simple and easy-to-understand language. The picture changes in odd seconds, which deeply attracts our attention. After talking about the principle, the teacher gave each student a set of equipment boxes. I can't wait to open it. There are electromagnetic boxes, brushes, motors, springs and other materials inside.
According to the teacher's production steps, I first connected the motor and the electromagnetic box with a black line and a red line, and then fixed the motor on the big brush with screws. Then a broom similar to a writing brush is installed at the back end of the robot, and a spring eye is installed at the front end of the robot. Finally, two batteries were installed, and a lifelike sweeping robot was successfully made.
Flip the switch and the sweeping robot will start working at once. I saw its two round eyes wide open, blinking around the ground, looking for garbage everywhere, sweeping wherever it was dirty, and automatically changing direction when encountering obstacles. Watching it turn around and keep busy, I can't help but think of the hard sanitation workers. I think in the near future, sweeping robots can help them clean and lighten their work.
I feel very happy during these five days of study. I not only learned the scientific knowledge of series circuit, magnetic levitation and lever principle, but also made so many scientific small productions in the exploration and research. It's really meaningful.
On June 1, my mother bought me a set of parts for a model ship, and I jumped three feet high happily, which is to say nothing of Joey. In the afternoon, I invited two students, Xue Cheng and Wang Haoyang, to help me assemble the model.
When the work is ready, I assign them tasks and start action. I glued the deck with universal glue first, and then installed the cab. At this point, Xuecheng has completed the five-star red flag. Then I glued it on and started to make the hull. I put the bottom of the boat together with two bottom plates, and then put two side plates on it. Hmm! The basic shape of the ship is ready. Then, I fixed the hull with screws. At this time, the screw seems to be playing hide-and-seek with us, but it can't be found. Suddenly, I thought there were screws at home, so I rummaged through the boxes and found them. In the end, only those tiny parts need to be installed, which is a big problem. I was just about to give up. Wang Haoyang told me. Didn't your mother tell you? Don't give up halfway, or you can't do anything well. Come on, I'll show you how to do it. After Wang Haoyang's guidance, I realized that it was a piece of cake for Zhang Fei to eat bean sprouts. Three times five divided by two is done. Take a closer look, ha! What a style! In order to be more realistic, we installed several small windows in the cockpit and made an observation room! We cheered and put the boat into the water to see its heroic posture on the water, but unexpectedly, the boat did not move, as if it were against us. At this time, Xue Cheng shouted: Ah! I forgot to make the motor! Sorry, hee hee! Wang Haoyang and I both stared at him, then put the copper core and iron sheet in Madanes, and then fixed the motor with screws and installed it on the ship. Then, install cannons and planes. Ha! A model aircraft carrier was born. We put it in the water and saw it swimming happily.
Suddenly, I seem to be a captain, standing on a ship I built and swimming in the ocean of scientific knowledge.
Last week, my mother bought me a small and exquisite compass.
I turned the compass around and couldn't understand why its hands always pointed to the surface. In the evening, my father came back and saw me playing with a compass. He asked, "What's the matter?" I said, "Dad, why does the compass always point to the water?" Dad said, "The compass was invented by our ancestors. Our ancestors knew that magnets can absorb iron, so they made a compass that can move freely. " . Why can a compass point the way? It turns out that the earth is a very big magnet. Like a magnet, it has two poles, one is called geomagnetic North Pole and the other is called geomagnetic South Pole. Because the compass is a magnet, it can move, and the magnet is like-minded and opposites attract, so the compass on the earth always faces the geomagnetic north pole and the geomagnetic south pole. ""Oh, that's what it is. It's so interesting! " I said.
Dad also told me that the compass was one of the four great inventions in ancient China, and the earliest compass was called the compass. I asked my father, "So, how to use this compass?" Dad said, "put it flat, and then the pointer will rotate under the action of the geomagnetic field." When it stops, one end points to the south and the other end points to the north. " Compass is mainly used to tell the direction when the direction is unknown, but it can't be used in some places with unstable geomagnetic field, such as deserts and some canyons. "
Ships sailing on the sea and planes flying in the sky need compasses to point out the direction; When we travel to the suburbs, the compass will also bring us great help ... the compass is really our good helper!