Everyone has his own ideal, some want to be a doctor, some want to be a teacher … and my ideal is to be a scientist and make the world a better place.
If I were a scientist, I would invent a universal pill that can cure any disease. This will make the elderly healthier, adults stronger and children more lively and lovely.
If I were a scientist, I would invent a solar car, which can run normally at any time. As long as there is a ray of sunshine, it will absorb sunlight and convert it into energy. Shh ... Let me tell you a little secret. It can also absorb carbon dioxide and release oxygen! How's it going? Isn't it amazing?
If I were a scientist, I would invent a garbage collector. This garbage cleaner is not an ordinary garbage cleaner. It can turn useless things into useful things. Very convenient.
I really want to be a scientist, but there is still a long way to go. What we can do now is to study hard and make this ideal come true.
Now it is 20xx, and there are countless high-tech products and high-tech houses, including glass houses, snow houses, underwater houses, boat houses, forest buildings and barrel houses.
I have a particularly domineering house, which is unique on the earth. Its walls are bulletproof, and so is its glass. Whether it is a bullet or a wall-penetrating bullet, as long as it touches the wall of my house, it will be tackled immediately, and the safety factor has increased a lot. The most interesting thing is that there are several lines of defense in front of my house. The first line is the cornea, which is used to wash the eyes. The second line is to unlock the fingerprint. The third line is to brush your face. The fourth line is verification. Haha, that sounds troublesome. It is not troublesome to use, and the whole process will not exceed five seconds. If it judges that you are family, it will open the door immediately, otherwise it will be locked, with a general error rate of 0.2%.
The first thing you see when you enter the door is a piece of glass, not ordinary glass. This is a telephone glass invented by a scientist. If you stand in front of the glass for more than three seconds, the glass will make a sound and ask who you are looking for. As long as you call once, he won't forget, and there is no such thing as downtime. As long as you name it, even in the Pacific, he can help you find this person. Then I will see a TV, not an ordinary TV. It is connected with other electrical appliances and can prevent theft. If the thief touches the appliances, every appliance will sound an alarm. And it will emit light that can hurt people and beat the thief away.
Let's introduce here first.
I remember on a Sunday morning, my sister and I played table tennis at home, and we had a good time. The ping-pong ball was dented because of excessive force. I looked at the sunken table tennis with a sad face and suddenly had a brainwave: can I change the sunken table tennis back to its original appearance? So, I took a ping-pong ball and asked my father.
"Dad, how can I restore the sunken table tennis to its original appearance?" I asked. Dad said, "put the ping-pong ball in the cup and then rinse it with boiling water." I did as my father said. When I rushed to the table tennis with boiling water, the depression of the table tennis slowly expanded and changed back to its original state. I asked happily, "Dad, why is it so amazing?" Dad smiled and said, "It's not magic, it's because of the principle that heat expands and cold contracts. Thermal expansion and cold contraction are the basic properties of objects. Generally speaking, an object will expand when heated and contract when cooled. All objects have this property. "So that's it! I didn't expect such a big mystery. "
From this experiment, I understand: in fact, in our daily life, as long as we observe attentively, we will find more interesting things, stimulate our greater thirst for knowledge and explore higher scientific knowledge and mysteries.
In last week's science class, the teacher asked us to bring plasticine, wooden blocks, table tennis, rubber balls, glass bottles, foam, iron sheets and pebbles to prepare for scientific experiments.
After the experiment, the teacher said to us, "Now do an experiment to see what can sink in the water." What can float in water? "Through experiments, students know that plasticine, iron sheets and small stones will sink when put into the water, while wood blocks, table tennis, foam and glass bottles can float in the water. The teacher asked again, "how can I make plasticine float in the water?" "I crushed plasticine by hand, then wrapped it in foam and threw it into the water. As expected, plasticine floated. When the teacher saw it, he shook his head and said, "Let the plasticine float, and nothing else can be used. "I must find another way. I squeezed plasticine into the shape of a boat and then carefully put it into the water. The plasticine boat floated on the water. I was so happy that I quickly invited my teacher to see my "masterpiece". The teacher smiled and nodded, and my heart was filled with joy. The teacher asked again, "can you make the glass bottle sink?" "Hearing this, I held the glass bottle high and threw it into the water. I thought I could sink, but the glass bottle climbed up quickly after drilling to the bottom.
At this time, I thought that when I was swimming, I could float with my breath held, and my breath would sink. So I opened the glass bottle cap, let the glass bottle die and fill it with water. At this time, I saw the glass bottle shake a few times and sink. Doing experiments by hands is fun and interesting, and you can learn a lot.
I did two experiments after dinner today.
In the first experiment, you need to prepare a washbasin, a tap water cup and paper balls. First connect the washbasin with half a bottle of water, then tear some paper and knead it into a ball, and put the paper ball into the bottom of the cup. Next, put the cup vertically into the water. The paper in the cup won't get wet at all. It turns out that if the cup is put vertically into the water, the paper will not get wet at all, because the air in the cup can't get out and the water can't get in, which means the air occupies the space of the water. But if you put the cup into the water obliquely, the paper ball will be soaked immediately, because the air goes out and the water must come in slowly, which is that the water occupies the air space.
The second experiment needs to prepare a washbasin, tap water and plastic bags. First, fill the basin with water, fill the plastic bag with air, tighten your mouth like a balloon, and then press it into the basin. I found it wouldn't sink, and the water was bubbling. I think it's strange. If you fill the bag with water and press it, there will be no bubbles in the water and the bag will sink. This is because air without water is lighter than water and will float on the water. Italian scientist Galileo said: "All reasoning must come from observation and experiment." Science is meaningful only if it is done by itself; Only by doing it will the experiment succeed.
I like doing experiments, science, and love science!
I remember when I was a sophomore, my sister graduated from college and came to my house to do experiments with her. She said the experiment was very interesting and taught me after she finished it.
We happily bought experimental tools, a box of watercolor paints and two glass bottles. After settling accounts, we did experiments in my backyard. My sister told me to boil water, get some salt and a branch, and then winked at me. I really don't know what medicine she sells in the gourd.
I took everything my sister needed to the backyard. I saw my sister put the salt in a glass bottle, painted her favorite purple pigment, brewed it with hot water, and gently stirred it with branches. The sunken salt came out of steam and floated up. Put it in the refrigerator after evaporation.
After a while, we took the glass bottle out of the refrigerator. The crystal-clear salt crystals looked very cute in the glass bottle. My sister asked me to make one, too I made a pink salt crystal according to my sister's steps. After I finished, my sister and I cheered loudly. This is my first experiment, but I didn't expect it to succeed! This is a beautiful experiment.
I asked my sister what the principle is, and my sister said, "Because salt is saturated in its aqueous solution, it will crystallize and evaporate."
What an interesting experiment! The success of this experiment not only let me know the principle of salt crystallization, but also let me understand that as long as I dare to experiment, I can explore the mysteries of science!
Have you ever tried science in your life? Maybe not, but I did it. Come and have a look!
I found this experiment on TV by accident. In wartime, in order to send information safely without being discovered by the enemy, intelligence workers used a method called "writing secret letters". Seeing this, I am curious. Why can't we see the written words? Better, let me make a scientific attempt!
I took out a science and technology book and found the steps to do the experiment. I dipped some white vinegar with a clean brush, then spread a piece of white paper on the table and wrote a poem on the paper with a brush. The words are dry, and there are no traces of words on the white paper. Then dip a clean brush in the carrot liquid and evenly spread it on the white paper, and the words will appear.
What is the principle? I checked the computer, and the computer showed that the secret of white vinegar secret letter was the natural pigment of carrot. As long as carrot juice is coated on an acid-containing object, it will appear on white paper. I'm especially glad I found the answer.
"It is more valuable to explore the truth than to have it." Einstein said this sentence is really a famous saying. As long as you are a conscientious person in life, have a keen heart and a pair of observant eyes, you can discover scientific mysteries that you never knew.
I looked at the sky and sighed. I thought to myself: The weather was fine just now. It doesn't rain early, and it doesn't rain late. I was just about to go out when it began to rain. When I was worried, my mother asked me to drink wolfberry tea. As soon as I saw Lycium barbarum tea, I became interested in it immediately. Because I saw a lot of Lycium barbarum floating on the top of the cup and a few Lycium barbarum at the bottom of the cup, I felt particularly strange. Why do some Chinese wolfberry float on the water and some Chinese wolfberry sink under the teacup? I thought about it carefully: maybe Lycium barbarum is like a ball, and there is air in it that can float on the water.
I started doing small experiments. First, I took out two pieces of Lycium barbarum floating on the water, put one of them in the water and flattened it with a pair of chopsticks. As I expected, Lycium barbarum really bubbled in the water. Then I took off my chopsticks to see if the Lycium barbarum would sink. I saw the Lycium barbarum sink slowly. Then I put a wolfberry on the bottom of the teacup with chopsticks and took off the chopsticks. The wolfberry slowly floated up and finally floated to the water. Well, I finally figured it out. It turns out that my guess is right. Because the air in the first medlar came out, it sank. And there was air in the second medlar, so it floated up.
Through this little experiment, I learned a truth. Lycium barbarum is like a ball. With air in it, it can float on the water, but without air, it will sink. composition