Kong Yingda came to the academy office, which was the place where the academy masters worked on weekdays.

Seeing Kong Yingda coming, Li Chunfeng quickly stood up and said, "My master, how are you doing today?"

Kong Yingda put away the booklet and said, "Today is also a day of great success."

Taking Kong Yingda to his room, Li Chunfeng said, "On weekdays, we masters live in the academy."

Kong Yingda walked into Li Chunfeng's room, and the walls were filled with dense formulas, which looked very cunning at first glance.

Seeing Kong Yingda's expression and looking at his room, Li Chunfeng smiled awkwardly: "The Hushe has not been sorted out for some days."

As he said that, Li Chunfeng was tidying up and said, "Why would you say hello to His Highness the King of Wei? There is still an available house in the academy, and the old master can live here."

Kong Yingda waved his hand and said, "My identity is not suitable for living in the academy."

Li Chunfeng sighed, thinking that Kong Yingda's identity represents Confucianism. If Confucian children knew that Kong Yingda lived in the academy, they would probably have more twists and turns.

Looking at the formula on the wall, Kong Yingda asked, "What are you thinking?"

Li Chunfeng sighed: "I saw a symbol in Li Zheng's book on Mathematics. Later, Daniu said that this symbol is pi. This number is larger than three but smaller than four. There are countless digits after three. One four and one five. It is said that it is a formula that can never be calculated."

Kong Yingda said: "Take it serious?"

Li Chunfeng sighed and said, "It has been three or four years since I went to Jingyang. I have been calculating this pi in the past two years and have been counting it to the fifty-fourth place. At present, it has not yet reached the end. I spend a few hours before going to bed, but I still haven't finished it."

Kong Yingda asked in confusion: "There is such a thing?"

Li Chunfeng nodded and said, "I have also seen this algorithm in other classics when I was young. I have calculated it by my predecessors a long time ago, but it is not as clear as Li Zheng."

As they were talking, a group of children ran out of the academy together.

Li Chunfeng said: "Today, the big bull and his people are going to conduct experiments again. Should we go and see them together?"

Kong Yingda nodded and said, "It's good, it's good."

Middle-aged Li Chunfeng walked out of the academy with the white-haired Kong Yingda.

Following a group of children, they came to the riverside of Jingyang.

Kong Yingda also met Li Shimin standing here.

Li Chunfeng and Kong Yingda went forward to salute together.

Kong Yingda said curiously: "Your Majesty is here to see the experiment?"

Li Shimin just said calmly: "I'm just here to have a walk."

There were also many people on the other side of the village, and the leader of these people was Yan Liben.

Following Yan Li himself, there are a thousand recruited apprentices.

These apprentices have been in Jingyang for a month.

Seeing Yan Liben's great momentum, Li Shimin didn't look much and continued to observe Daniu and a few children.

Yan Liben said to the craftsmen: "Most of you have mastered the pumping technology, and everyone's purpose is to learn technology. Next, you can take a look at this experiment. After reading it, if you want to leave and get your wages tonight, you can go home. Those who want to stay will continue to learn skills."

Both sides of the river were filled with people.

Everyone was staring at the situation in the river.

A boat floated upstream of the Jingyang River.

A very small boat is a very small fishing boat.

The four of them were on the boat, including Daniu, Di Renjie, Pei Xingjian and Li Zhi.

As the ship slowly came to everyone's eyes.

After a closer look, there were very thick stone pillars behind the ship.

Li Shimin wondered: "How does this stone pillar float on the water."

Li Chunfeng explained: "I have seen the drawings in the research institute. This stone pillar is actually hollow and poured with mud. The reason why it can float is because there is still wood under the stone pillar."

Li Shimin approached and took a closer look, "It's true."

The four children swam to one end of the four pillars.

Li Shimin had already approached the river without realizing it, and his curiosity in his eyes could not be concealed. He looked carefully at the stone pillars that were still connected together by chains.

With the order from the big bull.

The four of them fought together and pulled out the raft at one end of their stone pillars.

The water flowed into the hollow stone pillars immediately.

Slowly the stone pillars began to sink.

The four children also followed the stone pillar downstream.

When one end of the stone pillar completely sank, everyone saw that the other end of the four stone pillars was a flat platform.

When the stone pillar stood intact in the river, Daniu, Li Zhi, Di Renjie and Pei Xingjian also swam up, as if confirming that he could not push the stone pillar no matter how he swam in the water.

Li Shimin observed that the stone pillar really seemed to be unable to push.

Looking at Li Chunfeng, Li Shimin said, "What's going on? Is it standing in the river?"

Li Chunfeng brought a bowl from the side and put it upside down in the ditch and said, "Your Majesty, please see, because of the water pressure, it is difficult to pick up the bowl in the water. The greater the water pressure, the harder it is. The depth of the Jingyang River is good, so once the stone pillar is pressed by the water, ordinary people can't push it at all. This is the principle."

Li Shimin nodded slightly, and there was still doubt in his eyes.

Piles of poured stone slabs were transported into the river.

Using the four pillars as fulcrum points, the stone slabs began to be laid.

One hour later, a platform was built in the river.

Li Shimin simply sat down and continued to watch, the more he looked, his brows frowned.

Half a day passed, Li Shimin was eating the food brought by Wang Ding, and the children were still busy. It turned out that they were going to build a house in the river.

After reading for a while and eating the rice in the bowl, Li Shimin picked up the science book beside him and focused on the relationship between water pressure and air pressure.

By the evening, the houses built in the river had already taken shape.

Li Ji walked around the village and said, "Your Majesty is still here?"

Li Shimin pointed to the river and said, "I didn't expect that I could build a house in the river without filling the river."

Li Ji said: "It's true. It won't affect the downstream without filling the river. It's also very light to build a house in the river."

It was getting dark, and Daniu Li Zhi and his children also got ashore.

When Li Zhi saw Li Shimin, he hurriedly came to salute, "Why is Father coming?"

Li Shimin followed Li Zhi back and said, "Is the house strong like this?"

Li Zhi said: "In fact, we have also treated the bottom of the river, and the tightly clamped it, which is still very firm."

Li Shimin nodded slightly and said, "It turns out that you have done something under the river."

Li Zhi explained: "We have also built corresponding platforms at the bottom of the river, otherwise it would not be so strong."
Chapter completed!