I returned to Chang'an with a few lively children, young is good, I don't know what it means to be tired, I tossed in the field for an hour and didn't blush or panting, so Li Chengyang's plan to use these to educate the four elementary schools fell through.

Where did Li Zheng really dare to call Sixiao as a stupid son of a civilian family, but he just let them play in the field for an hour, which made Sixiao Piao not good, one by one really thought that farming was such an easy thing, and one by one threatened to play again in the future.

Entered the palace and sent the four children back to their residences, which can be regarded as unloading today's burden, it is really difficult to see the children, the four children are chattering, and listening to too much can annoy people to death.

Back in the side courtyard, the carpenter actually waited outside the door early, which had never been encountered, and only after asking did he know that he was in trouble.

The waterwheel can't be built, the object is too big, and if you want to build it in a short time and improve it, it's not just a simple talk, either call someone in, or go to find some carpenters to come over, or submit the drawings to the Ministry of Engineering and let them start to do it, there is no other choice.

Li Chengyang looked at the small side courtyard, there were not many empty houses, and the nine people of the secret guards occupied the house about the same, plus now they have to leave a few houses for their younger brothers and sisters, and they will inevitably live in the future, surrounded by a garden where the guards live, there is really no other place to leave it for the newcomers.

Gotta hand it over, now he has to take his younger brothers and sisters to study, he can't spare much time to debug the waterwheel, if the Ministry of Industry wants to get things to be approved by Li Shimin next, it is better to send this thing directly to Li Shimin, according to his temperament, he must make great efforts to study.

made a decision, took the drawings from the carpenter, and went to Li Shimin's study without entering the door.

When he entered the door, he threw the drawings on the table: "Dad, look at this thing, the waterwheel I just researched has about the same importance as the Quyuan plow, full of hydraulic power, and can run by itself without human management, according to basic speculation, the area along the river can be watered a day 100 acres of fertile land, I can't do it there, come and teach you to do it."

Li Shimin gritted his teeth and looked at his son, the scene of acting with Duan Zhixuan was still vivid, but he couldn't say it yet, and now when he saw Li Chengyang, he felt like a monkey jumping up and down.

Forcibly erased this untimely feeling, picked up the drawings on the table and looked at them, he had also seen the fine drawings drawn by Li Chengyang before, and the complex waterwheel drawings were only carefully pondered for a while before he understood.

It doesn't seem to be a big problem, it's not impossible to say that it's ingenious, such detailed drawings believe that it won't take long to make things as they are, but he is not as happy as he was when he got Qu Yuan Plow, he is curious, where did Li Chengyang know these things, who did he learn from, and the few things he threw out are all objects that have great benefits to Datang.

The emperor's suspicion began to play its role, he was wondering what kind of person would have such a great ability, Li Chengyang took out the chair and table and said that it was accidental, the original ice control method, and the independent establishment of the ice control department can also be said to be accidental, what Arabic numerals and algorithms were also turned out of the pile of old books, okay, it was also accidental, and so was Qu Yuan Li? Now this waterwheel in your hand is too?

It is almost inevitable that too many accidents will happen, how can Li Chengyang do so many profound things at a young age, Li Shimin believes that Li Chengyang will come up with more and more incredible things in the future, but that is for the future, what needs to be figured out now is who Li Chengyang's teacher is and what his attitude is towards the Li family.

With such a mysterious person behind him, this is the thing that Li Shimin is most worried about Li Chengyang, he is not sure if Li Chengyang can still be like this in the future, and he is not sure if someone really has bad intentions towards the Li family, he can't afford to gamble on this matter, so he looked at Li Chengyang solemnly and asked;

"Yang'er, you tell me the truth, did you still have a teacher before you were claimed by your imperial grandfather, otherwise how did you come up with so many things, don't tell me that you read a lot of books, I have let people read all your books, they are all books that you usually read, there are no such things you made at all, today you explain things clearly, otherwise you still don't feel at ease."

Blinking his eyes, he didn't expect a waterwheel to become the fuse of this matter, Li Chengyang also knew in his heart that this thing would happen sooner or later, fortunately, he had prepared before, if he entered someone else's body when he crossed over, then he could hide this matter for the rest of his life, the world only needs to use it, and others can reply to the family tradition when they ask, and no one will take this matter to understand.

It's Li Shimin's eldest son, the future prince, try to ask which emperor will hand over the crown prince to a person who doesn't know the roots, even if this person is his own son, if this kind of thing is not explained clearly, Li Shimin's heart is always like a thorn in his heart.

"Dad, it's not that I don't say it, it's mainly that no one believes it, so I just don't say it, if you want to know, then I'll tell you all about what happened to me, believe it or not, I'm telling the truth, I can still prove myself" The words have been said to this part, and there is no need to hide it, just say the prepared excuses, and no one will doubt it in the future.

Li Shimin nodded and motioned for him to start, and Li Chengyang cleared his throat:

"Dad, you know Zhuang Zhou's dream of butterflies, that is, Zhuangzi dreamed, dreamed that he became a butterfly, spent his life as a butterfly in a dream, and when Zhuangzi woke up, he still felt that he was a butterfly, and he couldn't tell whether it was reality or a dream, you should have known this for a long time."

Li Shimin nodded, this story comes from the theory of all things in "Zhuangzi", which was already known when he was a young student. Then he spoke: "I know this story, do you mean that you also dreamed of becoming a butterfly and lived the life of a butterfly?" ”。

"No, I didn't become a butterfly, but became a person, a living person, I will hurt in my dreams, I will cry, and the passage of time is the same as our Datang, I spent more than 20 years there, and when I woke up, I was still in the previous courtyard, but the time was only one night"?

Li Shimin frowned and asked, "Small courtyard? Is that the one that your imperial grandfather arranged for you to live in the first place? That is the time when you suffered from brain damage and gained this divine power? ”。

"It's not brain-dead, how did the quack tell you everything, at that time I couldn't tell the difference between reality and dreams, so it seemed a little weird, and then I fainted, who knows how it became brain-dead in the quack's mouth, and then I slowly got used to it, you and my mother came to pick me up, and you know what happened after that."

Li Shimin nodded, expressed understanding, and asked again: "Then you learned all these things in your dreams?" So what do you have in your dreams? How many other things like the Quyuan plough you offered earlier? ”。

Li Chengyang's expression was a little complicated, he had almost forgotten the past these days, but now that he started to think about it, countless memories popped up in his mind, making his eyes moisten a little:

"There is everything in the dream, in our words, the fairy world is nothing more than that, you dare to believe that the land is about the same as ours, enough to feed 1.3 billion people, and none of these 1.3 billion people are hungry or cold."

Li Shimin shook his head, now there is enough land in Datang, but there is a shortage of manpower, but even if there are enough people, and the whole Datang is planted with grain, it will not be able to support 1.3 billion people, let alone prevent them from starving and cold.

"People in dreams know the world without going out, and if something happens around the world, it can be transmitted to the whole world in a few breaths, even if it is closed for a lifetime, it will not miss a big event."

Li Shimin shook his head again, he began to be interested in Li Chengyang's dream.

"Everyone there has a book to read, the law is equal to all people, the prince is guilty of the same crime as the common people, there are the strongest soldiers guarding the territory, people can go to heaven and enter the earth, everyone can live to be seventy or eighty years old, the old are supported, and the young are dependent, such a place, it is not an exaggeration to say that it is a fairy world."

Seeing Li Shimin nodding thoughtfully, Li Chengyang continued:

"As for things like the Quyuan plough and water wheel, it is almost extinct there, and someone has made a machine that can sow and harvest grain day and night, no matter what kind of grain, as soon as the machine is spitting out, it becomes a clean finished product, and there is no need to manually threshh or clean the field, the machine will do things well, and this thing can harvest 300 acres of land a day."

Li Shimin swallowed his saliva, he was a little greedy for this kind of machine, Li Chengyang saw this and added a fire: "The waterwheel is almost extinct, most of them are used in the scenery, and they are deliberately placed in beautiful places, and have become a tool for people to cultivate their sentiments, in order to turn some places without water sources into harvest places, the people there plan to dig out a big river running through the north and south in more than 40 years, and they don't use too much manpower and material resources."

Li Shimin seemed to be shocked by the scene described by Li Chengyang, a Grand Canal of the Sui Dynasty was stripped of the family funds of the Great Sui, and in the end, the people who were even tossed were not able to make a living, which became an important reason for the fall of the Sui Dynasty.

Listening to what Li Chengyang said now, he can't imagine how powerful the country that can do such things will be.

After a long time, Li Shimin's eyes lit up and asked Li Chengyang: "You said that everyone there has books to read, so what are you learning, but you have learned all the machines, and you have also learned the things that can fly into the sky and the earth, as well as food, there are treasures everywhere, why do you take out a zigzag plow out." ”。

Immediately felt that the Quyuan plough that he loved just now was not fragrant, if there was that kind of machine, wouldn't it be able to plant all over the Tang Dynasty, just one year, he would no longer be afraid of anyone, the family? To hell, even if the family disappeared with all their people, relying on those grains, it would only take three years for a continuous stream of young people to appear, where would they be so tied up like now.

Li Chengyang covered his face rarely, and returned embarrassedly: "At that time, because there was too much to learn, it was impossible for people to learn all the knowledge in their lives, so when they went to the advanced school, they were all classified for students to choose.

Li Chengyang stammered and couldn't go on, Li Shimin almost jumped up in a hurry, Li Chengyang's performance made him feel a little bad, and he stood up and asked, "What did you learn, you just said it."

Li Chengyang closed his eyes: "History, history major, and I often went to work for some people at that time, and I didn't learn history well, so it's good to be able to make a quyuan plow or something."