Du He saw Du Ruhui in the study, and saw that Du Ruhui was more haggard than before.

I guess I'm worried about my own business!

Du Ruhui raised his head and saw Du He, there was no movement, but his eyes suddenly brightened a lot.

"He'er, are you back?"

"It's back!"

In a simple conversation, Du He could feel Du Ruhui's concern for his unique father.

Du Ruhui nodded: "It's good to come back, you need to be careful when you do things in the future, before you change, I will definitely educate you well, but now that you have grown up, Dad knows that you have your own ideas, so no matter what you do, Dad will not blame you." Even, when necessary, can support you. ”

Du He's heart was a little shaken.

To a certain extent, Du Ruhui's thinking is ahead of its time than 99 people in this era.

The father and son chatted for a while, and then went back to their rooms to rest.

Early the next morning.

Du Ho went to the furniture factory again, and then entered the palace with the gold medal.

The promise he made to the old man has not been fulfilled.

When he came to the lake in the east of the palace, to his surprise, the old man did not fish, but hid in the pavilion next to him to fight the landlord.

In addition to the old man, there was also a man in black and a thin teenager.

The man in black was the old man's bodyguard.

The thin young man, Du He is also familiar with, is Li Er's son, Li Ke, the king of Shu.

To say that among Li Er's sons, Du He admires Li Ke the most.

This guy is low-key, but he's very smart.

Even the ministers of civil and military affairs also recognized that Li Ke's talent and learning should be above the crown prince Li Chengqian and the king of Yue, Li Tai.

It's a pity that Li Ke is destined not to compete for the queen.

Because he is the child of Li Er and Concubine Yang.

And Concubine Yang is the daughter of Emperor Yang Guang of the Sui Dynasty.

No matter who becomes the emperor, it will not be Li Ke's turn.

At this moment, Li Yuan and the black-clothed guards were already covered with notes on their faces, but it was Li Ke who didn't have many notes on his face.

Du He stepped forward, patted the old man's shoulder, and said with a big grin: "Old man, your card skills are too bad, a good deck of cards, you played like this dog, it really lost my Du He's face." ”

When Li Ke heard this, he was suddenly taken aback, pointed at Du He and reprimanded: "Du He, you ......"

Before he finished speaking, he was interrupted by Li Yuan: "Ke'er, shut up!" ”

Li Yuan handed the card to Du He: "You have the ability, you come!" ”

Du He smiled, took the playing card, and won in a few clicks.

As a landlord, Li Ke was put on a note.

Li Yuan still wanted to continue to fight the landlord, but was stopped by Du He: "Old man, I am very busy, I don't have time to play with you, I came today to fulfill my promise, I am going to tell you the method of fishing all the fish in the lake." ”

When Li Yuan heard this, he was still more interested in fishing.

So he grabbed Du He and sat down next to him: "Tell me quickly, is there any good way to get all the fish in this lake?" ”

Li Ke next to him heard it and came over curiously.

Du He touched his chin, "Of course I have a way, I'll write down some ingredients first, you go and help me get it, the more the better!" ”

Du He took out a paper and a pen, and wrote a full article.

In addition to raw materials, there are also quite a few tools.

Li Yuan took it and looked at it, looking confused.

"What are these things for?"

Du He smiled: "The one who makes gunpowder!" ”

"Gunpowder...... What is gunpowder? ”

Du He didn't plan to hide it: "You will know by then, hurry up and prepare!" ”

Regarding the gunpowder, Du He did not plan to hide it, anyway, Yuan Tiangang already knew the method of refining gunpowder, even if Du He didn't get it out, gunpowder would begin to circulate in this era.

Li Yuan handed the list to the man in black.

About half an hour later, the man in black came back with two huge sacks, opened them and saw that they were full of materials that Du He needed.

"I need a quiet and dry room now!" ”

Li Yuan nodded: "No problem!" ”

There happened to be a courtyard by the lake, and there was a courtyard, which was Li Yuan's living place, and the man in black immediately cleaned up a clean room and handed it to Du He.

Du He went into the room with the raw materials, and then slammed the door shut.

In the courtyard, Li Yuan and the others were honestly guarding the door, wanting to see what the hell Du He was doing.

Li Ke raised his head, looked at Li Yuan, and asked curiously, "Grandpa Huang, why do you want to hide your identity from Du He?" ”

Li Ke is only twelve years old, but he already has a mature temperament that his peers do not have.

Li Yuan laughed and asked, "Ke'er, what do you think ordinary people will do when they see me?" ”

Li Ke thought for a while and said seriously: "Of course I'm afraid!" ”

Li Yuan nodded, and said with a smile: "I like Du He very much, and in my heart, I even regard him as a friend, if I identify myself to him, I am afraid that it will scare him, and when the time comes, I will not even have a friend to talk to." ”

Li Ke's ignorant face showed a look of understanding or not.

……

in the room.

Doho will have all the materials ready.

"Fortunately, I've read a lot of information on the manufacture of earth explosives before, otherwise, I may not be able to solve this matter!" Duhe muttered to himself.

What he said to Li Yuan and others was to make gunpowder.

In fact, it was the earth explosives that Duhe wanted to make.

Moreover, he plans to use this thing to fry fish.

The raw materials of black powder are nothing more than saltpeter, sulfur and charcoal, which only need to be configured in strict accordance with the weight, which can basically meet his requirements.

However, these raw materials are rough and unbearable, and Duhe still needs to be selected and processed.

By the time he finished the black powder, it was almost dark.

On the way, Li Yuan arranged for the man in black to bring food in for him.

Freshly made black powder is a little damp and needs to be dried overnight before it can be used.

Du He made the arrangements, pushed open the door, and saw Li Yuan and Li Ke waiting in the courtyard.

Li Yuan asked excitedly, "Du boy, have you already made black powder?" ”

Du He waved his hand: "Old man, what's the hurry, you can't eat hot tofu in a hurry, don't be impatient, tomorrow morning, I can take you to fry fish, when the time comes, let you see, what is black technology, hehe...... It's been a tiring day, and the bones of this young master are about to fall apart, let's talk about it tomorrow, remember, the things in the room can't be moved, don't blame me for not reminding you! ”

As he spoke, Du He was about to leave.

But Li Ke suddenly asked: "Duhe, I heard that you will always have some strange things, such as playing cards, where did you get these things?" ”

This question is also something that many people, including Li Er, are puzzled by.

Some people believe in this kind of thing when the gods give it, but some people don't believe it either.

Du He looked at Li Ke with a serious look, smiled, and said, "Of course I did it myself!" ”

Li Ke said curiously: "But why would you, and I wouldn't?" ”

Du He scratched his head: "Because, we learn differently, you have read the Four Books and Five Classics since you were a child, but I read physical chemistry, can it be the same?" ”

After speaking, Du He waved his hand and slipped away first.