Science is a charming word. The charm of science lies in broadness, justice, eternity and sublimity. Below, I compiled a comprehensive review of the open class in the third quarter of 2023. I hope you like it!

Tonight, I saw the little gecko that ate mosquitoes yesterday. Because my mother called me to the living room, she killed the gecko. The gecko's tail is still moving on the floor. I was shocked and thought that the gecko's tail was alive! Look at that gecko again. It doesn't move. It looks dead!

I think of the text "Little Gecko Borrows Tail" I learned before, which said that Gecko broke its tail and ran away, but didn't say that Gecko's tail would move!

I didn't know there was such a thing until I looked up the information on the Internet-

When the gecko was attacked by the enemy, its muscles contracted violently, causing its tail to break. The tail that has just been broken is always moving because the nerve is not dead, so it can be used to protect itself from running away.

At the same time, there is a hormone in the gecko that can regenerate its tail. When the gecko's tail is broken, it will secrete this hormone to make the tail grow, and when the tail grows, it will stop secreting.

Oh, I see. It seems that there is science everywhere in life!

Wan Li: It's cloudless and sunny in Wan Li today. I'm going to the composition class in high spirits!

Just entering the classroom, I saw a plastic cup, a small piece of paper and a pot of yellow water on the teacher's desk. A big question mark popped up in my heart: what is this? I thought to myself: forget it, the truth will come out when the teacher comes! Just then, familiar footsteps came from my ear, and the teacher finally came! Just then, the class began and the teacher said, "Let's do the experiment today!" " "The students jumped three feet high with joy. The teacher picked up the glass first, and then poured the water from the pot into the glass. The water is rising gradually and will soon be full! Then, the teacher carefully put the paper on the glass. Finally, the teacher held down the paper and rotated it 180 degrees. The most surprising time has come. The teacher let go of the hand holding the paper, but the paper hasn't fallen off yet! I opened my mouth wide in surprise. I can hold an egg! The teacher told us that this is the role of air.

Through this time, I understand a truth, we can't underestimate science, which is of great help to society and life.

One clear day in Wan Li, Wan Li, I came to the composition class and saw a transparent glass, a pot of yellow water and a long piece of paper on the teacher's desk. I thought to myself: Are we going to do an experiment today?

After class, the teacher said, "Today we will do experiments." It's exactly what I thought. I can't wait to see how the teacher does it. The teacher has a cup in his left hand and a kettle in his right. I saw the water flowing into the cup like a stream. Gradually, the water was filled immediately, but the teacher was still filling, just1mm. The students shouted, "Stop, stop, stop!" " Even I'm yelling. Finally, the teacher stopped. Then the teacher put a piece of paper on the cup. There seems to be a hat on the cup. Hold down this paper, it rotates 180 degrees. The water didn't leak. The teacher took his hand away. The paper didn't drop and the water didn't spill. At this time, countless question marks popped up in my heart? The teacher said: "It is the air that resists the paper. The pressure of water is less than that of air, so it will not flow out."

From this experiment, I understand that air is a kind of wealth.

Today, my father and I did an interesting little experiment.

We brought two identical paper cups and a lighter. Then a paper cup is filled with water and a paper cup is not filled with water. Dad raised the paper cup and lit it under the quilt with a lighter. Results The paper cup without water burned a hole in the bottom of the cup for 5 seconds, and the paper cup with water was still intact after 1 minute.

"Why is this happening?" I asked my father curiously.

Dad told me: "there is no paper cup full of water." The paper cup directly absorbs the heat of the lighter, and soon the heat absorbed by the cup reaches the ignition point of the paper cup, so the paper cup burns quickly. " In a paper cup filled with water, the heat transferred by the lighter is quickly transferred to the water through the paper cup, and most of the heat is absorbed by the water, while the cup itself absorbs little heat, so the cup will not be burned. "

Hehe, such a small experiment has proved the truth of heat transfer to us. It seems that there are so many interesting sciences around us!

How to treat the third quarter of 2023 (option 5)? Do aliens really exist?

We often see reports of aliens in newspapers, and many people claim to have seen aliens. So do aliens really exist? Some scientists believe that there are almost hundreds of billions of stars in the Milky Way, and quite a few of them have planets, while the estimated number similar to the earth's environment is one million. Those planets are likely to be able to produce life and evolve intelligent creatures like the earth, some of which may be more advanced than the current human civilization. There are also some scientists who believe that it is entirely possible to have extraterrestrial intelligent life in theory. Aliens really exist. 1983, an oval metal object fell over the Soviet Union. There is an alien baby boy in it. His feet are webbed like frogs! But what aliens really look like is still a mystery. It's amazing. Science needs your careful observation.

Examination questions:

How old must a planet be to have life?

Answer: Any planet, if there is life, has been born for more than 65.438 billion years.

Before, I thought science was far away from us. Now, I know that science is actually very close to us. Life is full of science!

It's the New Year! My sister and I decorated our little room together! We brought a small balloon to cheer ourselves up. Soon, we finished decorating our little balloon. However, we were in a daze with small balloons. Do you know why?

It turns out that we have to put patterns on the wall and there is no tape at home. What shall we do? We think hard, but we can't think of a good way. My sister asked me, "No, ask my mother." So we told our mother about our troubles, and her mother smiled and said, "Just wipe the balloon on your hair and stick it on the wall." This method works, but why?

My sister and I went to the science library to borrow books. Finally, we found in a book "Little Knowledge of Science" that it was because of static electricity. Is science near? As long as you observe carefully, you will feel that there is science everywhere in your life.

In the third quarter of 2023, there are many scientific truths around us, which need our constant observation and exploration. Let's take a look at the science around us.

In our life, science is everywhere. If we observe carefully, we can know a lot of scientific knowledge.

The teacher asked us to prepare a ruler and some pieces of paper. We asked curiously, "What do you need these things for?" The teacher said mysteriously, "You will know later." The teacher wiped her hair several times with a ruler and put it on a piece of paper. The paper was sucked up. It's amazing!

The whole class was boiling when they saw this phenomenon, and everyone shouted to have a try. Like her, I gently rubbed my hair with a ruler and the small pieces of paper were sucked up. So you can generate static electricity in your hair. Where else? I tried rubbing a few times on my short sleeves and pants, and small pieces of paper could be sucked up. But it's strange that your sneakers can't be sucked up after a few rubs!

I like this interesting experiment, because it is not only interesting, but also allows me to learn a lot of scientific knowledge.

Early this morning, Mr. Chen came into the classroom mysteriously with his handbag, as if it contained a secret weapon.

I saw the teacher take out several colorful balloons from the handbag, and the students cheered. Some ran to the podium to grab the balloon in the teacher's hand. Teacher Chen called two Hercules and blew the balloon as round as two red lanterns. The students below are all saying "explosion, explosion ……", which makes my head dizzy. The female students were so scared that they closed their eyes and covered their ears.

I saw Mr. Chen Tie blow up the balloon with a thread, and then suck it on the blackboard with a magnet. Everyone is curious. At this time, the teacher invited a little girl wearing a white gauze skirt to go on stage and gently rubbed the balloon with a ponytail. I thought to myself: Is Mr. Chen going to let the balloon explode? As a result, the bruised balloon and another balloon actually got into a fight, pushing and bumping into each other and not giving in to each other. At this time, the teacher took another piece of A4 paper and put it between two balloons. They actually made up, which really opened my eyes! Finally, the teacher took away a piece of A4 paper, and they fought again. They are really two naughty balloons.

Ah! Science is really interesting! I really want to have science class every day!

I did an experiment at home today, called a mixture of oil, water and salt.

First, I fill a glass of water, and then put some oil and salt. I began to observe and found that the oil rose slowly at first, but the water floated below. Why? But I took my time pouring some salt. At this time, it changed. Oil drops slowly, while water rises slowly. Why? I wanted to look it up on the internet, but later I learned that oil is half as light as water, but water is heavier than salt.

But after adding salt, oil is heavier than water. When someone asks, "Isn't oil half of water?" ? Is it as heavy as water after adding salt? Then why is the oil underwater? Don't worry, let me tell you, because salt is lighter than water, but there are many small cells in the water. When salt is mixed with these small cells, it is more than half of water. When the weights of oil and salt are added together, oil is heavier than water.

Through this experiment, I learned that we can also become small experimenters as long as we pay attention to observation.

In the third quarter of 2023, the encyclopedia of comments on open science classes (selected articles 10), there are so many sciences around you! Let me introduce some scientific knowledge I have observed to you.

If you have something to go out, be sure to check whether you have unplugged the power, otherwise it will be very dangerous. In case of fire, only water can be used to put out the fire. Putting out a fire with oil will not only fail to put out the fire, but will add fuel to the fire. In summer, if you are bitten by mosquitoes, don't worry. You take an aloe leaf and squeeze some water out of it, so it won't itch.

In cold weather, if you feel cold, you can put a hot water bottle on your body to warm up. When changing water for fish, you can use the siphon principle to suck out the dirty things at the bottom of the fish tank with a tube.

The light in the basement will light up as long as the sound reaches a certain decibel, which is particularly energy-saving. There is also an inductive touch desk lamp, which lights up when touched by hand, and goes out when touched again, which is particularly convenient to use.

In public places, inductive faucets can sense water and avoid people's cross-infection. There are countless sciences around us, so let's find them with our heart and look for them with our heart. They are everywhere.

Science and technology is the primary productive force and plays an important role in the development of human history. In human life, science and technology are widely used in various fields.

In agriculture, due to the application of science and technology, human beings have cultivated hybrid rice and genetically modified fruits ... so that the grain output has been continuously improved and the quality has been continuously optimized. Humans have also invented various seeders, fertilizers and harvesters ... which makes the labor force invested in agriculture less and less.

In medical treatment, due to the application of science and technology, people have invented various high-tech medical instruments and drugs, which can treat patients painlessly and prolong people's life.

In national defense, due to the application of science and technology, scientists from various countries have invented various scientific and technological weapons ―― missiles, fighter planes, radars, etc. They play an important role in safeguarding the territorial integrity of the country.

In life, due to the application of science and technology, we invented telephones, televisions, computers, cars and airplanes ... so that we can go to heaven and get in touch with people thousands of miles away.

Technology is amazing! Scientists are so great!