On the second day, Gu Qingxin took Di Renjie to the bookstore with satisfaction. Many adults had already brought their children here, with more than a dozen children, and the number was a bit small, but it was a class.

Gu Qing said to Di Renjie: "You will be the class monitor here from now on. You must manage these children well."

"Yes!" Di Renjie answered seriously with a bunch of books.

Several adults were puzzled, "Do you really want money?"

"No money!" Gu Qing said with a smile.

Gu Qing is a county in the village and a famous genius doctor. He has been familiar with the village for a year or two, so he handed over the child to Gu Qing. Children of all sizes are sitting down, and Di Renjie handed over the books one by one.

Facing these children, Gu Qing found that the youngest was only four or five years old, the oldest was eleven or twelve years old, and the age span was a bit large.

Standing on his body, Gu Qing said to them, "Tell me, what are your goals in life."

Child A shouted: "Get a wife!"

Child B: "Eat meat!"

Child C: "Big house!"

...

Gu Qing raised his head and sighed, "What a simple child..."

Waving his hand to signal them to be quiet, Gu Qing said again, "The knowledge I want to teach you is different from those of Zhihu outside. I will teach you physics and science. This world is very big and has many mysteries."

"What is physics!" said a child.

Gu Qing is a person who is very familiar with the children. The guy who tells stories all day long is very close to the guy who wants to charge money.

"Good question." Gu Qing nodded, "Physics is a kind of pursuit of knowledge, such as why water does not flow to a high place, and where does the wind blow from."

"Can physics marry me?" another child asked.

"You may be able to get married if you learn physics." Gu Qing looked helpless.

The practice of physics is very important. Gu Qing took the children out of the bookstore and saw the simple water truck by the river beach. This kind of water truck is very simple and requires manpower to promote it. This kind of water truck is also called a rollover. It is not like a barrel truck, which can rotate as long as it is in the water.

"Today we are going to make a water wheel," Gu Qing said, "You know that what kites need to fly into the sky is the wind, and it can fly into the sky by itself. We want to make a water wheel that can turn with the water flow."

Di Renjie originally thought that the teacher could teach children to read, but he didn't expect to take the children out and teach them while doing them, which is different from the general teaching methods of bookstores.

Knowing that Di Renjie was confused, Gu Qing said, "Saying is important but teaching by example is also important. Teaching by example and teaching by example, teaching by example cannot be delayed."

"Students understand." Di Renjie nodded and called on the children to build the water truck together.

Gu Qing was commanding and was having a lot of fun! The adults who were farming on the side also looked over and knew that Gu Qing wanted to build a water truck that could not require manpower, so they also came to help.

The wood was made into various shapes, and Gu Qing began to piece together some bearings and wheel hubs according to his memory.

"Teacher, the water tube has been made. I don't know if it's the size is right." Di Renjie said with two water tubes.

"Very good." Gu Qing looked at the water tube, "hang all these on the wheel hub."

"Okay!" Di Renjie nodded and said.

Fang Xuanling was discussing with Li Er in the palace about how to deal with the Tuyuhun army. Wang Qin walked over in a small step, "Your Majesty, Gu Qing opened a bookstore."

"Shushang?" Li Er was puzzled, "Kong Yingda told me that she wanted to ask Gu Qing and the Imperial College professor to learn. This guy has no reply and now he has opened a bookstore himself? Does this guy look down on my Imperial College?"

"Does Kong Yingda know about this?" Li Er said again.

"It shouldn't be known yet." Wang Qin said, "Gu Qing opened the bookstore in his own village, but it was not ostentatious."

After Fang Xuanling and Li Er talked about the matter, they left the palace early and came to Pushan Village in a carriage. Shushe didn't even want to say that he was surprised to see the words in front of the door, "Hide in the small building and become a united state. No matter how spring, summer, autumn and winter, this kid still has a calm temperament."

Not far away, I saw Gu Qing and a large group of children talking and laughing by the river in the fields.

Shaking his head in disappointment and sighed, Fang Xuanling said, "Let's go back."

The coachman looked at the huge wheels being pushed up, and was about to rush the car and turned around and was stunned.

Seeing the coachman's situation, Fang Xuanling also looked back and saw that the huge wheel hub was spinning, and it kept watering in the fields, using only a small bracket to support the large wheel hub.

"Go and have a look." Fang Xuanling said and walked forward.

Gu Qing said to the children, "The flow of water is powerful. Leaves will flow when floating on the water. The same water flow pushes the wooden tube to drive the water truck to drive the transmission, so that it can irrigate with water, saving manpower! If irrigation is not needed, you can use this lever to lift the water wheel out of the water surface, so that it will not move again."

At dusk, the children watched the water wheel rotate and were proud! This was a water wheel they made with their own hands. A different knowledge sprouted in the hearts of the children. Gu Qing was not disgusted with the ancient unchanging teaching method, but was not so satisfied. He didn't have to read and just call him. In the end, he learned that he was not diligent in his four bodies and did not distinguish between grains?

"I'll be here today. I'll assign you a task, and you can draw every part of the water truck." Gu Qing said, "You can have a few people joining you, or you can ask your parents at home to help."

"Ao!"

A large group of children agreed and scattered.

"Gu Qing, you are..." Fang Xuanling looked at the huge water truck that could automatically rotate without human power, and said in a daze, "Is this what you did?"

"It was made by the children and I." Gu Qing looked at the huge water wheel and said, "It's amazing."

"Don't you want to go to the Imperial College?" Fang Xuanling looked at the water truck over and over again. The structure of the entire water truck could be seen at a glance, so simple that even a carpenter could make it. Such a water truck could be made so simple.

"Students know nothing about the Spring and Autumn Period of the Analects of Confucius and the Book of Songs." Gu Qing said, "I am afraid I am not qualified to be the sacrificial priest of the Imperial College."

"If this method of manufacturing water trucks spread throughout the Tang Dynasty, how many people could work less hard?" Fang Xuanling sighed.

Gu Qing explained, "Teacher, this kind of water truck is adapted to local conditions. The riverside here is wide and the water flow is fast, so the water truck can be driven. If it is other places, this effect may not be possible."

Fang Xuanling observed every detail of the water wheel and said, "Do you just teach your children these?"

"There are a lot of things to teach." Gu Qing said, "The only things to learn are not only those Books of Songs, so teachers should be regarded as students' wild ways."
Chapter completed!