The Lone Star of the Tang Dynasty

This made Li Er's hanging heart a little lower, and at the same time, he was even more looking forward to exploring this mysterious "scientific" world.

"What is the meaning of this?" Li Er was extremely curious about this, obviously the mystery of this telescope was not as simple as it seemed.

However, he suddenly thought of a possibility, "Childe, although this thing is easy to use, if you need any special craftsmanship or mysterious ritual......

"Ahem, Lao Li, you're wrong, we're eating!" Li Changge was disgusted at first, and then smiled, "Actually, the principle behind many seemingly simple things is not simple. Like a sword, do you know why the blade can cut through things, but the back of the knife can't?".

Li Er was stunned for a moment, and replied casually: "Well, of course, the back of the knife can't be used to cut things, because it's blunt." "

Li Changge nodded and continued to guide the topic: "That's right, then do you know why the back of the knife is 'blunt' and what does blunt mean?".

Li Er was speechless for a moment, he really didn't think deeply about the specific meaning of "blunt".

Li Changge laughed out loud when he saw this, and took the opportunity to explain: "You see, the reason why the blade is sharp is because its contact area is small, and under the same pressure, the smaller the contact area, the greater the pressure. For example, if you put the same weight of iron and paper on the dirt floor, the iron will sink into the ground, but the paper will not. This is the basic principle of pressure - pressure divided by the contact area equals pressure, and the greater the pressure, the stronger the destructive force. "

Although Li Er, Wei Zheng and others listened very carefully, they were completely confused about these physical principles, as if they were listening to a book from heaven, they knew every word, and when they were combined, they were like chickens and ducks.

When Li Changge found out this, he couldn't help but feel a little embarrassed, but he knew that he had to make them understand the importance of science so as not to go astray into superstition. So I decided to explain it again with another example.

"When I talk about science, I'm really looking at relationships, such as the relationship between pressure and contact area. Whether it is increasing the pressure or reducing the contact area, the pressure can be increased, which in turn can increase the destructive power. Going back to the example of the sword, it is through grinding that the contact surface is made to be very small, which increases the pressure and improves the cutting ability of the sword. Got it?".

Everyone echoed and expressed their understanding with a smile on their faces, but in fact, they didn't really understand the reasoning, and just nodded in agreement out of respect for Li Changge.

Li Changge knew that even the wisest group of people in the Tang Dynasty would not be able to immediately comprehend this new knowledge, let alone the Turkic barbarians who were still in a state of ignorance.

Therefore, the research and development of new weapons and ordnance was based on a high degree of wisdom, which was by no means easy for the Turks to master.

Li Changge couldn't help but laugh when he saw everyone so happy, although he wasn't sure if they really understood, but he had done his best.

He continued: "If you really don't understand, I can explain it to you in detail, or I can just make up a textbook and ...... it then."

Just when Li Changge's words were not finished, when Li Er, Wei Zheng and others heard the words "compiling textbooks", they almost squirted out the food in their mouths, and their eyes widened one by one, looking at Li Changge in disbelief.

"Childe, do you want to write a book and speak?!".

Li Changge was puzzled by everyone's reaction, scratched his head and said, "What's the matter?" I just want to compile this book, if you don't understand something, you can refer to it later. Is there anything wrong with that?".

Before the words fell, Li Er and Empress Changsun were stunned in surprise.

Wei Zheng, Du Ruhui, and Li Jing got up and saluted excitedly: "The great virtue of the son, we are deeply grateful on behalf of the people of the world!"

They were deeply shocked by Li Changge's willingness to write books and pass on what he had learned to the world.

You must know that Li Changge is only a teenager and is less than a weak crown, and he is about to publish a book at such an age, isn't he afraid that others will learn his skills and no longer have a strange place to live?

In the face of everyone's abnormal reactions, Li Changge was quite puzzled, and secretly wondered in his heart: I just plan to compile a basic textbook, is it necessary to make such a fuss? If one day I write such advanced knowledge as calculus, then wouldn't you have a collective heart attack?

The meal was boiling, and Li Changge was always confused.

When everyone went out for a walk after dinner, Li Erzheng wanted to ask Li Changge when he would see this book, and decided to collect ten copies as soon as it was published.

At this time, Du Ruhui suddenly let out a puzzled "Huh?", which attracted everyone's attention.

With an indescribable expression on his face, Du Ruhui said, "I found that the peasant people in this village are a little different from those outside. "

When they heard this, they looked around, but they didn't see anything unusual.

Li Jing nervously whispered to Li Changge: "Childe, there won't be Turkic soldiers among these people dressed up and mixed in, right?"

Li Changge smiled and dispelled his doubts, and said that he didn't see anything special.

Du Ruhui's doubts attracted everyone's attention, he said that he didn't know what was wrong, but he felt a little abnormal.

At this time, Li Er suddenly noticed a detail: "By the way, why are the plows used by the farmers here bent?" Hearing this, everyone was stunned, and then took a closer look, and found that sure enough, the plows used by each farmer were curved, not the common straight plows.

The plough is a large agricultural body with a large volume and a hard wood material, which cannot be permanently deformed into a curved shape naturally.

When Li Changge heard Li Er's words, he also understood their confusion: "Oh, this plow is indeed improved, and it is more labor-saving to use than the original straight plow." "

After hearing this, Li Er suddenly realized that Li Changge was not only studying scientific theories, but also improving agricultural production tools.

He couldn't help but think that it was no wonder that no one was seen plowing the land with oxen here, but ...... it in other ways

Wait, don't you use cattle to plow the land here?

Li Er was incredulous that the Quyuan plough mentioned by Li Changge could complete the cultivation without ploughing oxen.

The

importance of ploughing cattle in an agrarian society is self-evident, and the law of the Tang Dynasty severely punishes the killing of ploughing cattle, precisely because of the irreplaceable nature of ploughing cattle for agricultural labor. If this curved plough can really greatly reduce the intensity of human labor, so that the manpower is enough to replace the ploughing ox to complete the same area of farming tasks, then the value and transformative significance contained in it can be described as subversive.

Li Er looked at Li Changge with wide eyes, suspicious: "Childe, is this really so magical?"