Every time I wear a book, I am forced to turn around

In order to avoid being dragged to the conference site by his filial sons and daughters-in-law, Yan Jinyun wisely went to Professor Li to assume the identity of a teaching assistant.Of course, Yan Jinyun now wants to maintain his personality of "never studied, but learned a few words from his youngest son, and later learned to look up the dictionary himself, and now there is no problem with reading and writing", and he definitely can't compete with Professor Li To explore some advanced scientific issues, what he has to do is to help Professor Li maintain classroom discipline.

The children in the village are very naughty.Girls are okay, most little girls have to step on a small bench to learn to cook when they are three or four years old, and they are indeed a little more sensible than boys.But the boy is really a skin!They are used to running wildly all over the mountains and plains all day long, but suddenly they are asked to stay upright in a room, they can't sit still!

One or two days was fine, but in three or four days, the boys figured out Professor Li's character, and the classroom discipline was not so good.Professor Li used to be a university professor, and he is better at dealing with students who have grown up.For adult students, if they do something wrong or wrong, you just need to reason with them.

The children in the study class range from five or six years old to twelve or thirteen years old. Children in their teens can still reason, but how can they reason with five or six-year-old children?They seem to have listened, but I'm sorry, their left ear goes in and the right ear goes out!

When the child's parents saw Professor Li, they all said: "Sir, if my baby doesn't take classes seriously, you just beat him! If he hurts, he will be good." This is really not a scene, the child Parents really think so.From the perspective of the parents of the children at this time, if you learn from the master and the master beats you, is that called beating?That is called being responsible to you!

But as a senior intellectual, Professor Li doesn't have the term "beating up students" in his dictionary!

Children are actually very good at pushing an inch. When they find that the teacher can't help them, they feel that they can be a little more skinny.So Professor Li urgently needs a teaching assistant.It happened that Yan Jinyun was quite free on weekdays, so he took the initiative to take on the job.Yan Jinyun's peers still have to work all day long, but who can tell Yan Jinyun's sons and daughters-in-law to be capable? There is no shortage of work points for him in the family, and the original body's illness and weakness have been deeply rooted in the hearts of the people, so Yan Jinyun has passed away long ago. On the old-age life.When Yan Jinyun stood in the back row of the classroom, the children in the class were obviously much better behaved.

However, there are still children who do not listen carefully.

Yan Jinyun couldn't help calling a child's name: "Xiaowei, isn't there a firewood pile under your butt? It's burning you?" The little butt kept twisting and turning, as if unable to sit still, His eyes were still staring at the door.

Xiaowei is the most naughty child in the village. He led his friends to hide in straw stacks to roast sparrows, and almost burned other people's houses; All the three cents and four cents of his father's private house money were turned out; his grandmother gave him a new dress, which he put on in the morning, and the hole was torn at noon...

Every time he got into trouble, his parents would beat him up together.But the child has been skinned.It hurts when the stick hits my body, and I know to admit my mistake.After the beating is over, the mistakes will still be made, and the misfortunes will still be made, which is of no use at all.

Being named by Yan Jinyun, Xiaowei didn't show any fear at all, but showed an expression eager to try to reason with adults: "Uncle, my father, my grandfather, and my great-grandfather never went to school. I don't want to go either!"

Yan Jinyun said: "Your father, your grandfather, and your great-grandfather have never been to school, so they can only stay in the mountain nest to farm, but after you go to school, you can go out and build airplanes and spaceships." , can go to the moon."

In this era when televisions were not popular and children in mountain villages did not even have picture books, it was probably difficult for Xiaowei to imagine the magnificence of airplanes and spaceships.You told him that you could go to the moon, but he might still be thinking, so what if you go to the moon?Is it possible to go to the moon to farm?It's not necessary, is it?The land in Yujia Village is already enough for them to plant.It's like when beggars in ancient times imagined the life of the emperor, they imagined that the empress of the East Palace would spread the big cake, and the empress of the West Palace would peel the scallions.

In Xiaowei's view, filling his stomach is the most important thing. Can reading make more food in the field?Can reading make the fruit on the tree bigger?Can reading make the fish in the creek keep flowing so that they have fish to eat all year round?There is no concept of transforming knowledge into productivity in his little mind, so he feels that reading is useless.

Yan Jinyun looked towards Professor Li.Professor Li gave him a helpless smile.

To be honest, although Professor Li is very professional and responsible, he is not like a professional elementary school teacher who can guide students to develop good class habits and gradually make them like learning.

Yan Jinyun took out a handkerchief from his pocket, the most ordinary handkerchief, and asked Xiaowei and other students in the class: "Have you ever seen this kind of handkerchief? I can use it to wrap water and prevent it from seeping through." Leaked out, do you believe it?"

"I don't believe it!" Xiaowei was the first to shout, pulling his neck.

The other older and younger children also shook their heads.How can a handkerchief hold water?impossible!

Yan Jinyun demonstrated it to everyone.Professor Li had a cup, he borrowed it, poured the water in the cup on the handkerchief, the water seeped through the handkerchief, and all flowed on the ground.Xiaowei said happily: "Grandpa, you are bragging! Your handkerchief can't cover the water at all!" For children, it is very proud to expose the cowhide of adults.

"I haven't started yet, so don't worry." Yan Jinyun said.

Professor Li had already guessed what Yan Jinyun was going to do.He covered the mouth of the cup with a handkerchief, and then asked a female student to borrow a rubber band to tie the handkerchief tightly.Then, he led the students to the water tank outside the ancestral hall, scooped up a ladle of water with a gourd ladle, and poured it into the cup through the handkerchief tied to the mouth of the cup.Yan Jinyun has been paying attention to the water in the cup. When the cup is seven or eight percent full, he stops filling the cup and turns the cup upside down so that the mouth of the cup is facing down.

Yan Jinyun motioned the children to look at his cup, the water in the cup was caught by the handkerchief, and it didn't drip!

Xiaowei circled Yan Jinyun's hand twice and asked, "Uncle, can you do tricks?"

Yan Jinyun couldn’t let go of his uneducated persona, he just said: “It’s not a trick. It’s just that when I was washing the cups, I suddenly discovered such a phenomenon. You can try it, just follow the Do the steps I just did, everyone can use a handkerchief to hold the water. Teacher Li, do you know what this is?"

Professor Li looked at Yan Jinyun with a complicated expression.Yan Jinyun was firm in his own personality, and asked carefully in Professor Li's ear: "Could it be that this cannot be explained by science? Then am I doing something wrong? What should I do?"

"It can be explained." Professor Li looked at the children and said, "The water doesn't flow out because of the atmospheric pressure."

Yan Jinyun looked like he didn't understand: "Then what is atmospheric pressure? What is it used for? Can it be used for farming?"

"Of course it can. For example, we can use the principle of atmospheric pressure to make a water pump. If there is a flat land on a mountain that can be reclaimed to grow vegetables, but there is no water source around, there is only a stream at the foot of the mountain. In order to grow vegetables After planting well, you can only carry water to the mountain continuously. With the water pump, it can automatically send water to the mountain, which greatly improves the efficiency of farming. Save the effort of carrying water, and you can open up more More farmland and vegetable fields came out."

Yan Jinyun handed the cup and handkerchief to Xiaowei: "Did you understand what the teacher said? The teacher said that if you don't learn knowledge, you can only plant a limited amount of land. But after learning some knowledge, you will have Kung Fu cultivates a lot of land at the same time. In that way, you will have more and more food, and your life will be better. Do you think reading is useful?"

After all, Xiaowei and the others were still playful, got the cup and handkerchief, and followed Yan Jinyun's steps to repeat this simple atmospheric pressure experiment.It is not enough for one child to try it out, other children have to try it too.The outside of the ancestral hall was filled with children's laughter.They chirped and laughed: "Ah, I succeeded! I also covered the water!"

Xiaowei approached Yan Jinyun and Professor Li, and asked excitedly: "How to build a water pump? Can we build it? With a water pump, my father and the others don't have to work hard every day to carry water." It is really convincing, since an ordinary handkerchief can be used to wrap the water flow, it must be possible to let the water flow to a high place.

Professor Li said: "This kind of machine already exists in the city. As long as we have tools and raw materials, we can certainly make it." Seeing that the children were very interested in what he said, Professor Li vaguely understood something, and he knew how to do it. It's like teaching the children.He briefly explained the concept of atmospheric pressure to the children in words they could understand, and at the same time used the tools he could find at hand, such as washbasins and candles, to lead the children to do other atmospheric pressure reduction experiments.

By the time school is over, the children are still unsatisfied, and they are reluctant to leave the class!

In the evening, when every household was cooking, Xiaowei's family started beating their children again.Xiaowei ran ahead and ran around the village. His father held a rolling pin and chased after him.Xiaowei shouted loudly: "Uncle, help me! Save me quickly!"

Yan Jinyun ran out when he heard the movement, Xiaowei ran behind him and hid as if he had seen a savior.Yan Jinyun was protecting the child: "Sanwazi, why are you beating the child again? Xiaowei performed very well in the study class today."

Xiaowei's father was very angry: "This baby is going to die if you don't beat him, Uncle, you don't know how much he tosses at home, his **** vest and my jacket are all ruined, he made water all over him. His sister's diaper It’s hard to dry, but it’s also wet!”

Yan Jinyun looked down at Xiaowei.

Xiaowei said confidently: "I was doing an experiment! I just wanted to find out whether any cloth can cover the water. My experiment is only half done, and my dad can't do anything." If you don’t ask, tell me you’re going to hit me.”

"What kind of experiment? What kind of experiment can you do? Fun is fun, don't make excuses." Xiaowei's father said.

"It's really an experiment! It was taught by my uncle." Xiaowei hid behind Yan Jinyun and made faces at his father.

Yan Jinyun: "..."

For a moment, I couldn't deny anything, Sanwazi, listen to Uncle explain to you.