If you Yuan Tiangang can see through it, it is also a great thing, and the expansion of basic cognition has a great effect on the impact of things.

When people understand the proper flow of air, they have wings to be able to glide, and the more they pursue the truth, the faster this still somewhat ignorant age will advance.

It's absurd to think that changing people's perceptions is almost impossible.

They often use some of their own knowledge to apply their understanding from experience.

Zheng Guogong, who stood at the forefront of the court, Wei Zheng stood out of the court, "The Chaochao Hall is a place to discuss state affairs, not a place for you to fight."

Zhang Yang looked at Wei Zheng with a smile, "Gong Zheng, Xia Guan didn't want to fight with Yuan Daochang."

Wei Zheng said in a deep voice: "As a scholar of the Ministry of Rites, you should also focus more on civil and state affairs."

"Gong Zheng is right."

Wei Zheng stood up, and Li Shimin signaled that the court meeting would continue normally.

Yuan Tiangang also retreated outside the hall.

The Ministry of War reported on the rectification of soldiers and horses this time, and there were even officials who said that Tubo would not recklessly start a war with the Tang Dynasty.

Zhang Yang listened to it in his ears.

This kind of words make the ears of the generals uncomfortable, they all say that it is their responsibility to expand the territory, and some people enjoy the current peace and do not want to start a war.

One mouth is no more than a hundred mouths, and listening to the commotion between civil officials and military generals, only Zhang Yang, Xu Jingzong, Zhang Daxiang, and Li Baiyao from the Ministry of Rites were silent, watching this quarrel coldly.

Niu Jinda's beard was brought up by the official again, and if he didn't mention it, forget it, so he saw that the civil officials and military generals were going to fight again.

Li Shimin shook his head and sighed and left.

When the emperor left, a group of people were still arguing about whether to start a war with Tibet.

The Taiji Hall was in a commotion, Zhang Yang shook his head helplessly, gave Xu Jingzong and Zhang Daxiang a look, and asked them to leave with them, not to mix blindly.

While everyone didn't notice the Ministry of Rites, they left here first.

A shoe passed over his head, and he didn't know who was so impersonal, and he took off his shoes when he quarreled.

Zhang Yang looked back and saw Niu Jinda, who was missing a shoe and had a smooth chin.

Ah, what a vibrant court.

Datang should be so energetic.

The crowd hastened their pace and left.

When he walked out of the Taiji Palace, Yuan Tiangang was still standing outside the hall, and there were also the eldest grandson Wuji and Fang Xuanling standing outside the hall.

Saluting to the two, Zhang Yang was puzzled and said, "The hall is arguing like this, won't the two of you go to persuade them?"

As several leaders of the court, Wei Zheng was impressively in the quarreling group, and he was also on the side of the civil officials.

Fang Xuanling and the eldest grandson Wuji in front of them are also the core figures in the court, and these two people look like they are out of the way.

Eldest Sun Wuji looked at the hall with a smile on his face, "Didn't you also come out? Besides, the Ministry of Rites should also have an attitude on whether or not to go to war, and it seems that you don't want to dwell on it."

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It's also easy to die when you go to sea.

It is somewhat unrealistic to pursue this ultimate question with a finite life.

Zhang Yang had a smile on his face, and after he had a firm answer in his heart, he would not be as confused as them, because in the eyes of future generations, the world seemed to be getting smaller and smaller.

If we want to look at the world from the perspective of the ancients, and look at it from the perspective of the later generations, it is the universe with distant stars.

As he spoke, Yan Liben came with something, and an iron rope was tied to an iron block.

The iron is round, and there are many marks of chiseling on it.

"I wonder if this thing can be used?"

Yuan Tiangang glanced at it and didn't speak, Zhang Yang frowned and said, "You might as well make two more."

Yan Liben gave a few instructions to the officials of the Ministry of Works on the side, and then said, "I will send it again later."

The Taiji Hall became more and more noisy, and another official hat was thrown out.

The eldest grandson Wuji smiled all over his face, "It's okay, as long as you don't die."

"Your heart...... It's huge." Zhang Yang smiled awkwardly.

Seeing that the sun was getting higher and higher, and the weather was getting hotter and hotter, Zhang Yang first thought for a while, and then said, "Daoist Yuan, please, let's go to Qin Tianjian."

Yuan Tiangang looked ahead and took a step.

As a few people walked all the way, Zhang Yang heard Xu Jingzong whispering behind him.

"Zhang Shangshu, in fact, as long as you admit your mistake, this matter will not be investigated too much."

Zhang Yang replied in a low voice: "If others say anything about me, forget it, I don't want the truth to be buried, and I don't want to see the world being ignorant."

"Fool...... Foolishness?"

There was another sigh from the rear of Li Daxiang, and he turned his head and walked towards the Suzaku Gate, where there were still a bunch of things to be done in the Foreign Affairs Academy.

Everyone followed to Qin Tianjian, Zhang Yang held a rope in one hand, and the iron ball suspended in the air shook back and forth from the left and right at the beginning, and stood still until the vertical ground did not move.

"Poor Dao would like to hear about it."

Zhang Yang nodded and said, "In Daoist Yuan's eyes, the ground under our feet is also still, right?"

"It's nature, and if the ground is moving, we can feel it, let alone stand firm."

Zhang Yang said, "How can you explain the movement of the starry sky?"

Yuan Tiangang slowly raised his head and said, "That's the starry sky moving."

The ground is not moving, it is the sky that is moving, and it has been answered, and Zhang Yang's question continues.

"If we don't move, and the land is still, then this hanging ball of iron should also be still, yes or no?"

"Exactly."

Yuan Tiangang replied without thinking.

In order to prove the rotation of the earth, later generations created an environment for experiments under limited conditions, and Foucault's pendulum is one of the most famous experiments, which is also a major achievement in the history of science.

Zhang Yang put down the iron cable, "Based on Daoist Yuan's cognition, I want to use a piece of land in the Qin Heavenly Prison, spread sand on it, the sand is about half a foot thick, and fence it off."

Yan Liben asked the people from the Ministry of Industry to do things.

Zhang Yang said again: "Yan Shangshu is slow, in order to prove that this experiment is not disturbed, I want to build three such environments, and the other two sites are chosen by Yuan Daochang, of course, the ground must be level."

Yuan Tiangang pondered for a long time when he heard this, "The remaining two are in the other two rooms of Qin Tianjian."

Zhang Yang held his hands and watched the officials of the Ministry of Industry busy.

Sometimes you can back down, and sometimes you face questions that violate common sense, especially when it comes to the knowledge you teach the princes, this kind of thing must be more serious.

It's not terrible to make a mistake for a while, but I'm afraid of making a mistake again and again.

Zhang Yang sat down in front of Qin Tianjian, although he couldn't change too much, at least he tried his best and did his best to make this knowledge shine in Datang.

Knowledge can change destiny, and the same knowledge can affect development.

Eldest Sun Wuji stepped aside, "It seems that you are very confident, there is no need to deal with this kind of thing

People argue to the end."

"I didn't want to argue with anyone, I felt like I was doing something very important."

The eldest grandson Wuji said in a deep voice: "The old man has always thought that you are a mercenary person, and now the matter you want to argue with Yuan Tiangang will not do you any good, and it is likely to cause you a lot of trouble later."

"If no one can do this but me, then I can't back down, I've heard many, many stories, and the people in those stories have never backed down."

Zhang Yang looked at the sky, "Maybe I can't be like them, but I want to do something as much as possible, if I can leave a few words to spread to the future, I think the world will be different in a few hundred years."

The eldest grandson, Wuji, whispered, "The old man has never seen someone as complicated as you."

"All people are complicated, and so is the human heart."

Zhang Yang slowly stood up and saw that the Qin Tian Prison was about to get ready.

The sand brought by the Ministry of Industry is river sand, a very light sand.

Zhang Yang instructed, "Hang the iron cable on the beam of the house."

When the people in the Ministry of Industry heard this, they did as they were told.

Fang Xuanling looked at the eldest grandson Wuji, "How did this young man respond?"

The eldest grandson, Wuji, said, "He was very confident.

Looking at the arrangement in front of us, the iron cable was tied to the beam of the house, and a very thin iron pestle was fixed on the iron ball that was vertical all the way down, and the end of this iron pestle was just touching the sand surface.

After finishing all this, Zhang Yang said, "According to Yuan Daochang, as long as the earth does not move, this iron pestle should just hang still."

Yuan Tiangang nodded, "Naturally."

"That's it, once the iron pestle moves, can it prove that the earth is also moving?"

Yuan Tiangang was silent for a long time and did not reply.

Zhang Yang said: "In order to avoid accidents in the experiment, I also asked the Ministry of Industry to prepare two other experimental sites, for the accuracy of the experiment, I hope that Qin Tianjian can close the doors and windows to prevent the wind from blowing in, and also have someone to guard, not to touch the sand surface and iron cables."

Yuan Tiangang nodded, "You can rest assured."

Fang Xuanling said, "Zhongshu Province can also arrange a few officers and soldiers to take care of it."

Noticing the look on Zhang Yang's face, Yuan Tiangang felt a little uneasy in his heart.

Zhang Yang saluted everyone present, "Since no one believes it, then let's witness the most amazing thing in the world, this iron pestle will definitely move, and it will move slowly on the sand table endlessly, year after year."

Looking at everyone, Zhang Yang said again: "You can make a record at twelve o'clock every day, and you will leave first."

The eldest grandson, Wuji, said suspiciously, "This is leaving?"

Zhang Yang smiled: "There is no point in standing here, it is better to come back tomorrow."

Leaving Qin Tianjian, Zhang Yang felt unprecedented happiness, he could finally come to this point, and he could finally let Datang get in touch with the tip of the iceberg of the truth of the world.

Even if this truth is only a little bit, it will definitely change as more and more people know about it.

Firmly believing in his heart, Zhang Yang walked out of the Suzaku Gate and walked back to the Vermilion Bird Street.

The streets are bustling with activity every morning and don't stop until noon.

Chang'an City will be very hot at noon, and in the summer, when the sun is at its hottest, people are busy with time and day for a day's livelihood.

Zhang Yang bought some meat dishes and two fish in Dongshi.

Back at home, Li Yue and Xiao Wu were practicing swords with Aunt Yang, Xiao Wu's movements were very clumsy, and the wooden sword in his hand would fall to the ground from time to time.

Zhang Yang came to the earthen stove to prepare for cooking, and these two river crucian carp looked very good, and most of them still had fish roe in their stomachs.

Fry the two fish, then pour some homemade soy sauce and sprinkle some green onions, and it's done.

Then boil a soup with diced bitter vegetables and meat foam, and prepare millet rice in another pot.

When the meal was served, Li Yue and Xiao Wu also practiced

The sword ends.

While eating, Li Yue said in a low voice, "Qingque said about the Turks before, why didn't he mention it when he returned to Chang'an City."

Xiao Wu took the fast seed to open the belly of the crucian carp, took out the fish roe inside and dipped it in the fish soup, and she enjoyed this fried fish beautifully.

Serving a bowl of bitter vegetable soup to his daughter-in-law, Zhang Yang explained: "Don't worry about Turkic affairs, it's the Turks who are anxious now, not us."

Li Yue's clear eyes were a little unconvinced, "Does the husband want to let the Turks mess up first?"

The millet rice is mixed with vegetable soup, which can be swallowed along with the soup, and after eating a bowl of millet rice, Zhang Yang put down the bowl quickly, "I fancy the Turkic grassland, and I want the grassland in the south of the Yin Mountain."

"Teacher, this caviar dipping in fish soup is delicious." Xiao Wu is very sensible, she sandwiched a large piece of fish roe for Li Yue.

It's a pity that the daughter-in-law's mind is not on food at all, and food can also be temporarily retreated in the face of family affairs.

She held the fast son in her right hand, clenched her fist and supported the side of her face, her smart eyes were thoughtful, and she said: "The grassland north of Yinshan still belongs to the Turks, although Your Majesty is the Khan of the Heavens, it is the Turkic war horses that are valued, not the grasslands."

Zhang Yang nodded and motioned for her to continue.

Li Yue's words continued, "The milk powder business is not important, whether it is the previous milk tea or milk powder, this is just a brick throwing for the husband, if you can buy the Turkic grassland, not only the milk powder is the husband's, but even the war horse can control the hands."

"Milk powder is just a temporary profit, and if you get the pasture, you get everything."

After speaking, Li Yue noticed that the food was about to be cold, and hurriedly ate it under Xiao Wu's gaze.

Seeing that the teacher had finished eating the fish roe, Xiao Wu squinted and smiled happily, and took the initiative to pack up the bowl and go to feed the bear.

Xiao Wu already regarded himself as a member of the family, and he was still a little restrained from following Li Yue at the beginning, but now he takes the initiative to do some things according to the teacher's living habits.