The great progress of science comes from new and bold imagination. Below I have compiled the contents of the Science World handwritten newspaper. You are welcome to read and study! Elementary school science quotes (1)

1. The question mark is the key to any science - French proverb

2. All reasoning must be derived from observation and experiment. ——Galileo

3. Art belongs to the ancient world, and science belongs to the modern world. ——Disraeli

4. Curiosity creates scientists and poets. ——France

5. My most important discoveries were inspired by failure. ——David

6. The great progress of science comes from new and bold imagination. ——Dewey

7. The spirit of scientific fraternity unites people who are scattered all over the world and are enthusiastic about science into a big family.——Roosevelt

8. Don’t be immersed in science for a long time. , and lose the ability to feel life, beauty, and poetry - Darwin Elementary School Science Composition (2)

Today I have a new, very interesting toy, and I want to know how it works Are you here? Let me tell you! This little toy is called a colorful fiber optic light. It was made by us in the science experiment class of Little Newton's class on Saturday. Let me tell you a little bit about optical fiber!

Optical fiber has many functions. It can be found in telephones and televisions. Optical fiber communication televisions can be used as television fax telephones. When talking, you can see me and me. Can see you too. Fax and telephone can also be used for TV teaching. In most teachings now, teachers can only teach on TV and students can watch in front of the TV and cannot ask each other questions. () If optical fiber "two-way" TV is used, it will be like a teacher having a face-to-face class with students in the classroom. It reduces the difficulty of communication between teachers and students, which is really convenient.

Do you want to know how doctors check for stomach problems? Let me tell you the answer! It is an instrument made of optical fiber that is inserted into a person's stomach, and the computer can display the situation in the person's stomach. If you encounter difficult and complicated diseases, you can also conduct computer consultation. Teacher Zhang said to us: "In the next few years, the new technology of optical fiber will have an infinite future, and its applications will be even more brilliant."

The teacher also taught us how to make colorful fiber optic lights. Connect the colorful light tube to the battery with two wires, then take out a handful of optical fiber and insert one end of it into one end of a small tube, stand the other end up, and insert the colorful light tube into the small tube. alright. Turn on the switch, and the colorful luminous tubes shine on the optical fiber, and suddenly they emit bright light one by one, constantly changing colors, and the colors are so colorful and beautiful. Little knowledge of natural science (3)

1. Why do sunflowers always face the sun?

The stems of sunflowers contain a wonderful auxin. This auxin is very photophobic. When exposed to light, it will go to the backlit side. At the same time, it stimulates the cells on the backlit side to multiply rapidly. Therefore, the backlit side grows faster than the light-facing side, causing the sunflower to bend toward the light.

2. Why do cicadas shed their skin?

The shell (exoskeleton) of a cicada is hard and cannot expand as the cicada grows. When the cicada grows to a certain stage, The cicada's exoskeleton limits the growth of the cicada. The cicada sheds its original exoskeleton, which is the process of sloughing.

3. How do bees make honey?

The bees first spit out the sweet juice from the flowers they collected into an empty hive. At night, they suck the sweet juice into their honey stomach to prepare it, then spit it out and then swallow it. This hesitation process takes 100 to 240 times, and finally it becomes sweet honey. Elementary school science experiment (4)

Small charcoal dancing

Take a test tube, put 3 to 4 grams of solid potassium nitrate in it, and then fix it upright on the iron frame with an iron clamp , and heat the test tube with an alcohol lamp.

When the solid potassium nitrate gradually melts, take a piece of charcoal the size of a small bean, put it into the test tube, and continue heating. After a while, you will see small charcoal blocks suddenly jumping on the liquid surface in the test tube. Sometimes they jump up and down, and sometimes they turn over on their own, as if dancing, and emit a hot red light. It is very interesting. Please enjoy Xiao Zatan's beautiful dance. Can you answer why Little Charcoal dances?

Answer

It turns out that when the charcoal was first put into the test tube, the temperature of the potassium nitrate in the test tube was too low to cause the charcoal to burn, so the charcoal was still there. Lying down. After the test tube continues to be heated, the temperature rises, causing the charcoal to reach the ignition point. At this time, a violent chemical reaction occurs with potassium nitrate, and a large amount of heat is released, causing the charcoal to burn and glow immediately. Because potassium nitrate decomposes at high temperatures and releases oxygen, this oxygen immediately reacts with the small charcoal to form carbon dioxide gas, and this gas immediately pushes up the small charcoal. After the charcoal jumps up, it breaks out of contact with the potassium nitrate liquid below, the reaction is interrupted, and the carbon dioxide gas no longer occurs. When the small charcoal falls back to the potassium nitrate due to the effect of gravity, the reaction occurs again, and the small charcoal reacts again. Jump up a second time. This cycle goes back and forth, and the little charcoal keeps jumping up and down.

I have an experiment, which is both simple and magical.

The experimental materials are as follows:

1. White sugar, 400 grams.

2. A new writing brush.

3. Two paper cups (one holds sugar water, the other holds water).

4. White paper, 2 to 3 sheets.

5. A lighter.

The experimental steps are as follows:

1. Make a cup of concentrated sugar water. It must be thick. If the sugar is not enough, add more.

2. Take a piece of white paper and lay it flat on the table. Use a brush dipped in sugar water to write or draw on the white paper.

3. After the sugar water dries, use a lighter to bake it briefly. The words or pictures you just wrote will appear.