Qiu Qiu photography

Original popular science knowledge story

"You guess, there are dark clouds because the sky is angry? 》

Text/Photography/Jiang Zhendong

One morning, Tigress and Yue Yue, Xiao Gang and Qiu Qiu were doing outdoor activities on the playground. On the edge of the bird's nest built on the branches, several birds are also singing, as if singing a growing song.

A gust of wind blows, leaves rustle, and they play the songs of nature together.

"Look up, there are many white clouds in the sky!" I don't know who shouted. After hearing this, several children quickly looked up at the sky.

Qiu Qiu pointed to a white cloud and said loudly, "What a big cloud, like cotton, so beautiful!"

Xiao Gang went on to say, "Look, is this cloud shaped like a goat?"

Yue Yue narrowed his eyes, took a step forward, then took two steps back, and then said unhurriedly, "Don't you feel like an elephant? Look, everyone has a nose! "

When you look closely, it really looks like an elephant, so you scramble to give it a name.

Who knows the name hasn't been decided yet? When I looked up again, I saw that the elephant cloud had lost a leg and even a nose. Several people laughed.

"Hey, if only these white clouds were cotton, you could make a lot of clothes, and the farmer's uncle wouldn't have to work so hard!" Go to have breakfast, Tigress looked at Bai Yunbian with emotion.

After lunch break, it suddenly got dark. The children rushed to the door of the classroom and saw the sky covered with dark clouds.

"The sky is full of white clouds in the morning. How do the white clouds turn black now? " Tigress looked puzzled.

Hearing Tigress's words, Xiaogang said to her, "I didn't even know that white clouds turned black after a long time in the sun."

"no! Because the sky is angry, the white clouds are black with fear! " Yue Yue said with confidence.

The teacher came and heard the children talking to each other. Knowing that they were curious about natural phenomena, he said, "Now all the clouds in the sky are dark clouds, and it's going to rain."

Before the teacher finished, the rain had fallen.

Son, the water on the ground evaporates into gas, which is water vapor. When the water vapor rises to high altitude and meets cold, it condenses into crystals. These crystals are the clouds we see, so the composition of clouds is mostly water vapor.

When the clouds are thin, light can easily penetrate, and we see white clouds. When the number of crystals is increasing, the number and volume are increasing, the clouds will be thick and low, and it will be difficult for light to pass through. The clouds we see are gray or black. When the air can't hold these crystals, it will form rain, which is what we call rain.

In our daily life, if we see white clouds in the sky, the chances of rain are relatively small, while if there are dark clouds in the sky, the chances of rain are relatively large. This has nothing to do with whether the sky is angry or not!

Son, judging from the formation process of clouds, dark clouds can become white clouds, and white clouds can also become dark clouds. Do you know why?

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Original good habit story

I want to drink boiled water.

Text/Photography/Jiang Zhendong

Mom took Xiaogang to Tigress's house to play. Tigress's mother brought them coke to drink. Xiaogang caught the bottle and thanked his aunt, but didn't open it.

When Tigress saw that Xiaogang didn't drink, she opened the refrigerator door and said, "Drink quickly. Look, our refrigerator is full of drinks. I'll get it for you after drinking. "

Xiao Gang said to Tigress, "I want to drink a cup of boiled water. My mother says drinking drinks is bad for my teeth. "

When Tigress's mother heard this, she quickly turned on the water dispenser and said with a little surprise, "Tigress and I both like to drink. Every time we go to the supermarket, we have to buy a lot. Learn Xiaogang and drink more boiled water in the future. "

Children, do you think that all the drinks we usually drink are colored? This is because drinks often contain additives, pigments and other things, which have a strong corrosive effect on our teeth. Drinking them often will not only harm our teeth, but also affect the absorption of calcium. Once calcium is lacking, bones will grow slowly and cause osteoporosis, which is very harmful to our health. It is said that children who especially like drinking are more likely to get fat.

In addition, water in the human body accounts for about 70% of the body weight. Water plays the role of transportation, nutrition supplement and participation in various metabolism of the body, and its role is irreplaceable by any beverage.

Don't look at boiled water, it's tasteless and ordinary. It is the most thirst-quenching and beneficial drink for our health. Boiled water contains no calories and can be directly absorbed by the human body without digestion.

Children, do you think we have grown up now? So our metabolism is faster than that of adults, so should we drink more white water and less drinks?

One night, Dad and Tigress went to the supermarket to buy things. Dad put two bottles of coke in the shopping cart. Tigress quickly said to her father, "My mother and I don't drink these drinks. We said to drink plenty of boiled water. "

Dad took the coke out of the shopping cart and said to Tigress, "You did the right thing. I also want to drink boiled water. Niu Niu will accompany me to buy a water cup now! " "