What Li Yu brought today are the entire academy textbooks and students' books, as well as some university books, but the university's knowledge is more profound. He was afraid that people of this era would not understand it, so he brought some of them and asked these teachers to study it in advance.

The teacher who taught arithmetic, when he saw the math textbook, was shocked, entangled, and delighted... and various expressions appeared on his face one after another.

They have been struggling with knowledge for half their lives and have not understood the problem, but they can find it omnipotently in these textbooks, and the solution is so simple.

An old teacher in his fifties held the university mathematics textbook tightly, cried to the sky, and said in a nagging voice: "Why, why, why, why didn't I be born decades later? Why, you didn't take out this knowledge decades earlier, and I've been calculating these numbers for half my life."

Seeing this, the other teachers couldn't help but burst into tears. Perhaps only they themselves knew the feeling.

Li Yu walked forward and comforted, "Don't be sad, this textbook is just advanced, I still have university mathematics knowledge here."

After saying that, Li Yu took out several university textbooks from his arms and handed them to the old teacher.

The old teacher choked up and looked at the textbook for a few pages, Ying Tian sighed: "God! If you learn this knowledge, there is nothing in the world that cannot be calculated?"

"Is this the knowledge in heaven?"

The old teacher held the textbook, looked at the sky and finished talking to himself, and turned around and left. He was excited, but his back was lonely.

"This teacher and employee are fine!" Li Yu looked at the old teacher and was worried about mental instability.

I saw a man wearing Taoist priest costumes walked out of the teaching staff and bowed to Li Yu: "The Taoist disciple Li Chunfeng paid homage to Marquis Li. He should have been caused by his loss and excitement, great sorrow and joy. It will be fine in a while."

When Li Yu heard that he was Li Chunfeng, a famous historical figure, he unconsciously stared at him.

Li Chunfeng is a famous mathematician and astronomer in history. He is proficient in astronomy, calendar calculation, and yin and yang. He is the first person in the world to rank wind. He is famous for his predictions by Yuan Tiangang for his accuracy.

After looking at Li Chunfeng, he thought to himself: "I wonder if the "Puo/Record Picture" is written now?"

When Li Chunfeng saw Li Yu's eyes, his heart was filled with huge waves. He came to his senses and quickly calculated without hesitation, and he quickly lowered his head and said nothing. He was shocked and whispered in his heart, how could it be possible, how could a living god live in the world?

Li Yu did not care about Li Chunfeng's incompetence. Since he and his master Yuan Tiangang wrote "Puo/Back Picture" and there was no difficulty in describing his identity, he did not take it in his heart.

Li Yu looked at Li Chunfeng and asked, "Sun Simiao is your uncle! Can you find him and teach the students the medical major?"

Li Chunfeng quickly gave another big gift and said respectfully: "My uncle has been traveling all over the world and treating the poor people. We don't know where he has traveled. In addition, my uncle has a old-fashioned personality and he may not stay in school to teach even if he finds it."

"Then forget it, I think if he comes to the academy to teach, I plan to give him a few sets of medical books! It seems that he doesn't have that opportunity, since he doesn't have that blessing..."

Li Yu stopped and looked at Li Chunfeng with a smile. He didn't believe it. Will Sun Simiao come to the academy to teach when he knows it?

Li Chunfeng was stunned on the spot.

After saying that, Li Yu went back without stopping in the academy.

Li Gang looked at Li Yu's back and looked at Li Chunfeng who was surprised but also thought about his worries. Li Gang had a smile on his face, thinking that the boy used the trick of seducing me to lure Sun Simiao out of the mountain.

...

When Li Yu returned home, he saw Li Xiuning half-sitting on the sofa. He saw Li Yu coming back listlessly, but he was so lazy that he didn't want to speak.

Li Yu asked concernedly: "What's wrong, you're listless, are you unhappy? Tell me, see if I can solve your troubles."

Li Xiuning rested her head on Li Yu's lap: "I think of Li Chun's past, which makes me feel uncomfortable. Now I don't want to do anything, and I'm bored!"

"Li Chun has nothing to do with her?" Li Yu's eyes showed concern.

"It's okay, she feels uncomfortable when she hears the music that makes her sad and reminds her of the past in the Turkic period." Li Xiuning shook her head sympathetically.

"That's good!"

After Li Yu finished speaking, he sighed in his heart.

He understood that Li Chun's inner pain would take a long time to calm down, and he had no choice.

Li Xiuning looked at Li Yu listlessly: "You think of a way to make me less bored?"

Li Yu nodded and smiled and said, "How about we play sand table and do a war game deduction? If you lead troops to fight every day, how about we just play simulated war on the sand table?"

When Li Xiuning heard the war chess deduction, her beautiful eyes lit up and asked quickly: "War chess deduction, sand table, is it really a game related to war?"

Li Yu nodded and said, "Yes, war chess deduction is to simulate various wars and take into account various reasons..."

"Okay, that's it, hurry up, get it out quickly." Li Xiuning interrupted Li Yu's words, and the soft kitten suddenly turned into a tigress.

Twenty large sand tables were brought out by Li Yu from the space. Fortunately, the living room was big enough, otherwise it would have been impossible to put it down.

By arranging twenty large sand tables in order and combining them together, a huge sand table is formed.

Although Li Xiuning was prepared for some thought, she was shocked when she saw the entire sand table.

This sand table was Xiao Ling scanned the entire earth and drew five continents and four oceans according to the scale topographic map. It has clear and detailed labels on the sand table, which is not inferior to the accuracy of the sand table in later generations and may be more accurate.

Li Xiuning saw the entire earth's sand table for the first time. She was confused at first. The occupied by China was too small. At the same time, the sand table gave her a visual impact, allowing her to intuitively see the whole picture of the entire earth.

From upstairs, Li Feier, Li Chun, Cui Zhimeng Wuniang, and after going downstairs, they saw the huge sand table of the earth in the living room. When they saw the exquisite cities, mountains, seas... after the sand table, they were shocked on the spot and could not believe everything they saw.

"Young Master, is this the whole picture of the earth we live in?" Li Chun, who replied, asked excitedly.

"I didn't expect that the place where we live was like this?" Cui Zhimeng felt incredible when she looked at the entire sand table.

The more she was like this, the more confused she felt. She didn't understand that the dull scholar in the past had become so hard that she couldn't believe it. She became more and more powerful, and she suspected that he was still the same person as him.

"This is Chang'an City! Why is it so small?" Li Fei'er pointed to the model of Chang'an City on the sand table.

After Li Fei'er asked, she asked again: "Brother, have you been to all these places?"

Li Yu nodded: "I have been to most places, but I haven't stayed for a long time. I mainly went to find those precious metal materials."

(Second update, updated here today, see you tomorrow)
Chapter completed!