The economic base determines the superstructure. The cultural popularity rate of Datang is not high, first of all, it is the constraint of the material base.

Because the papermaking technology and printing technology are not high, the cost of learning is very high, and the people cannot afford to buy books, and the large amount of paper used for learning cannot be consumed.

The second step of their plan was to introduce new papermaking and printing techniques. In order not to arouse the alarm of the gate valve clan, this is all going on in secret.

As for the third step plan, I will not discuss it here for the time being.

Part of the second step plan, and an important initiative to reduce the cost of writing, pencils.

The pencil lead is made of graphite plus clay, and the more graphite is added, the softer the lead and the darker the color; And the more clay is added, the harder the refill will be, and the lighter the color. The hardness is different, and they are used for writing and painting, respectively.

At this time, there was no rubber and no eraser could be made, so Li You used the same method used when the pencil was first invented to use breadcrumbs as a pencil eraser.

Since this is part of the second part of the big plan, Li You must consult Li Shimin before he can promote it.

Liangyi Palace, study.

On this morning, after the morning court, Li You asked to see Li Shimin.

"Father, come and see this." Li You took out a sharpened pencil and handed it to Li Shimin.

Li Shimin picked it up and looked at it, and it felt like a pen. Asked, "Is this a pen?" How does it look like this? ”

Li You said: "Father, this is called a pencil. ”

Li Shimin said "oh", picked up the pen, as if holding a brush, and wrote a few times on the paper, but a word appeared on the paper, but it was crooked and very ugly.

Li You smiled and said, "Father, this pen is not held like this. ”

He took the pencil, changed the posture of holding the pen, and wrote very skillfully.

"Huh?" Li Shimin took the pencil and tried it according to Li You's method of holding the pen, and he got used to it after a while.

He took a pen and drew a simple drawing, which he felt was much easier to use than a brush.

Then, Li You took out a piece of bread, pulled off a small piece, and erased a word that Li Shimin had written earlier.

Li Shimin was very interested, wrote and erased, erased, and played. He was shrewd and immediately saw the advantages and disadvantages of the pencil, and he said:

"This pencil is better for drawing than a brush. Being able to reuse paper is a powerful tool for learning culture. However, documents are susceptible to modification and are not suitable for record-keeping purposes. ”

Li You said: "Father is right. This pencil is perfect for beginners, and it is also very convenient for drawing cartes, ships, etc. ”

Li Shimin asked, "Is the cost high?" ”

Li You introduced the technology of making pencils to Li Shimin, and also talked about the location of large graphite deposits, etc., and said: "If you make a large number of them, the cost is very low. ”

Li Shimin said: "Then open a mine, set up a workshop, and start mass production." ”

"The retainers obey." Li You said.

……

Li Chengqian is finally back.

This Tuyuhun victory was one of the victories with the smallest losses and the greatest results of the Tang Army. Li Shimin personally presided over the welcoming ceremony of the triumphant victory of the Western Expeditionary Army.

Li Chengqian was praised by Li Shimin and gave him many rewards. In short, this expedition to Tuyuhun. Li Chengqian's harvest is the greatest.

At noon that day, Li Chengqian personally came to Li You.

Qi Wangfu.

Li You held a banquet for Li Chengqian to wash the dust. Xiao Wanyu, Zhang Guigui, Yin Guanghao and others accompanied.

A few people were polite for a while, and began to drink, and when they were a little dizzy, Li Chengqian suddenly remembered something, he took out a letter from his arms, handed it to Li You, and said, "Fifth brother, this is the letter from that Murong Ling to you." ”

At this time, Xiao Wanyu was sitting next to Li You, with an embarrassed look on her face.

Zhang Guigui and the others drank a lot of wine and forgot about Xiao Wanyu's existence. Zhang Guigui said; "Brother You, hurry up and read it, what did your wife say?"

Yin Guanghao said in a daze: "Yes, Brother You, I envy you very much, I'm afraid your wife is not going to chase Chang'an." Ha ha. ”

Li You opened the letter and saw that it was Murong Ling who was coming to Chang'an. He smiled: "Guanghao is right, Murong Ling said that she wanted to come to Chang'an to spend the Yuanzheng (Spring Festival)." ”

Xiao Wanyu's face became even more ugly on the side, and tears rolled in her eyes. In order to avoid being seen, she had to twist her head to the side.

Li Chengqian only remembered Xiao Wanyu's existence at this time, he was a little embarrassed, but he didn't say anything.

Xiao Wanyu was really uncomfortable, and under the pretext that she was too strong to drink, she left early.

Seeing Xiao Wanyu leaving, Li Chengqian said apologetically: "Fifth brother, I drank too much just now, I'm sorry." ”

Zhang Guigui and Yin Guanghao also came in the opposite and apologized.

Li You smiled: "What's this? Women, don't get used to them. It's not disrespectful to them, it's a trick of life.

Aren't we going to be a bunch of women? If they are used to being jealous, and the women are jealous together, how will they live?

Besides, since they want to be aristocratic women, they must be mentally prepared to accept all this. Otherwise, life after marriage will be a painful thing for them.

It would be a great thing for them to be able to think about it. ”

Li Chengqian thought so, and he said: "Yes, it should be like this." "Li Chengqian's temperament is a little weak, he wants to take care of every woman's emotions, but it turns out to be a mess. The women around him are not united, and there is constant friction.

Li You smiled: "Big brother is right. If there is only one woman for a man, you just coax her every day, and there is no problem.

It's a pity we're not. At this point, you have to learn from the emperor, you see, which woman next to him is not careful to look at his face, but the harem is very calm?!"

Li Chengqian nodded and said, "The fifth brother is reasonable, and I will do the same when I go back." ”

After that, he said, "Let's not talk about this. Fifth brother, I salute you, this time I went to Tuyuhun, big brother, I am beautiful. It's all your work, come on, cheers!"

Li You drank and said with a smile: "Big brother, let's not talk about this, let me tell you, there is another great credit, do you want it?" ”

"Oh, what a credit, you say." Li Chengqian said.

Li You said: "Magpie, go and bring the picture I drew ......."

After a while, the magpie brought a drawing, which depicted a staircase with the appearance of a stone tablet in the middle.

The stele reads: "Monument to the Heroes of the Tang Dynasty".

Li Chengqian didn't react for a while, and asked, "Fifth brother, what do you mean by getting this?" ”

Li You said solemnly: "Big brother, how many soldiers has Datang sacrificed since its establishment? Their heroic spirits should be remembered by future generations.

Think about it, if you suggest the establishment of this heroic monument, it will not only inspire my Tang soldiers to fight bravely and make meritorious contributions.

The point is, how can those family members who have sacrificed in their families be grateful to you? ”u