Datang: The prince of salted fish was overheard by Li Er

Facing such a big killer, Li You had to be cautious.

The formula of black powder is not difficult to find out, and the raw materials are also very simple. If Li You is willing to develop it, according to the current strength of Shence Mansion, a large amount of gunpowder can be produced soon.

Especially after having the system space, making simple firearms is not difficult at all.

Even if it is impossible to make precision rifled guns, there is no problem in making some earthen guns.

People in this age didn't use gunpowder for war, it just didn't occur to them.

And once someone starts it, it will be like opening a Pandora's box and it will be out of control.

Therefore, before establishing a relatively complete monitoring system, Li You is not going to let this power appear in front of the world.

This explosion made Li You feel a sense of crisis for the first time.

He felt that history was advancing at a fast pace like a wild horse running wild, and this time he saw that what happened 200 years later was just the beginning, and perhaps even greater changes were yet to come.

Next, Li You did not forget the purpose of coming here today, and told about the polishing of the lenses.

At the same time, Li You also took out the relevant books he had copied and found in the system space, and asked Haig to study on his own.

As for these technical matters, Li You thinks that professional matters should be left to professional people.

Lenses will be a big economic growth point in the future, and in addition to Haig, there must be a lot of craftsmen to be trained.

Li You has always paid attention to the cultivation of talents, but the speed of this talent cultivation is still far behind the speed of industrial development.

Although Li You has consciously not directly come up with the technology, but let them develop it themselves.

For example, this time when Cui Wenju took out the gunpowder formula, he caught Li You by surprise.

And such things happen from time to time in both Xinxue and Shence Mansion. These students who have been inspired by Xinxue to a new way of thinking have brought too many surprises and frights to Li You.

Before leaving, Li You asked Haig to assign blacksmiths to make corresponding glasses frames.

However, he didn't know whether he was too obsessed with eyesight or had a strong interest in the battlefield weapon that Li You mentioned. Li Jing came to the medical examination center on the third day.

Out of respect for Li Jing, Sun Simiao personally helped Li Jing check, while Duan Murong led the medical students to observe silently.

Although Li Jing was a handsome man who commanded an army of hundreds of thousands, it was embarrassing to be surrounded by so many juniors all of a sudden.

Fortunately, Sun Simiao explained: "Mr. Wei, these are students from the medical school. The King of Yan asked them to come and watch to get acquainted with the work of the physical examination, so as to provide physical examinations for more ministers in the future."

"According to King Yan's wishes, it is best for all ministers in the capital to have a physical examination, and anyone over 50 years old is best to have a physical examination every year."

"The death of Lord Du this time has dealt a great blow to King Yan..."

Li Jing had also heard about this matter for a long time. Although he had already looked down on life and death over the years, he still couldn't help feeling a little bit sad when these familiar people passed away.

Thinking that these people might really help his old friends in the future, Li Jing also relaxed and cooperated more with Sun Simiao's inspection.

Sun Simiao also deliberately slowed down his movements, and spent about an incense stick of time carefully examining Li Jing's body.

"Miraculous Doctor Sun, there is nothing wrong with my body, right?"

Sun Simiao nodded and said: "Duke Wei is in good health. Although there are some old injuries, they are basically not in the way. It's just..."

While talking, Sun Simiao suddenly looked at Li Jing's left leg.

At this moment, even Li You on the side had to admire Sun Simiao's superb medical skills.

Speaking of the generals of the generation of Tang Dynasty, they are all in good health. Except for a few people, most of them lived to be 80 or [-] years old.

For example, Li Jing can live another 20 years if he does nothing.

However, Li Jing has a relatively serious leg disease, and even claims to be sick at home for a long time because of this reason.

I knew my own problem. When Sun Simiao looked at Li Jing's left leg, Li Jing also understood.

"Miraculous Doctor Sun's medical skills are indeed well-deserved. My foot is an old injury. Once it rains, it will be very painful."

"I didn't feel it before, but it has become more and more powerful in the past two years."

Sun Simiao nodded, and said happily: "Thanks to King Yan for allowing Duke Wei to come for a physical examination, the problem is not serious now. I will prescribe some ointment for you, apply it on time, and you will be fine in three months."

"Really, if it is delayed for another year or two, it will be difficult to treat."

"It's even possible to be permanently disabled."

Li Jing knew that Sun Simiao's words might be exaggerated, but he was very happy to say goodbye to this problem that had troubled him for many years.

Taking advantage of Sun Simiao's opportunity to take a student out to dispense medicine, Li Jing asked about his eyes.

"Yan Wang, last time you said you could cure my eyes, but I don't know if you can just apply some medicine?"

Li You shook his head with a smile and said, "I'm afraid this will disappoint Duke Wei. Although my method can be considered once and for all, it is not as simple as taking medicine."

After finishing speaking, Li You took out a magnifying glass from his arms and handed it to Li Jing.

"Duke Wei, try using this to see things nearby."

Li Jing took the magnifying glass suspiciously, and looked at the book Li You handed over with it.

Suddenly, the long-lost sense of clarity reappeared in front of Li Jing.

He was so excited that he couldn't speak, and he looked at several pages with a magnifying glass before stopping.

"Yan Wang, your magnifying glass is amazing."

"I can see near objects clearly again."

Seeing Li Jing's excited expression, Li You said, "Someone will have an optometry for Wei Guogong in a while, and then we will customize a pair of glasses for Wei Guogong!"

"When the time comes, Duke Wei won't have to hold it in his hand all the time."

Hearing this, Li Jing raised his head to look at Li You, and asked excitedly, "Glasses! What are those?"

This is the glasses sample that Li You had already handed over to Li Jing.

"Wei Guogong is this thing, and we will put on the lenses that suit you according to your prescription."

After some explanation, Li Jing took the glasses and tried to put them on.

It has to be said that Datang has reached a very high level in the carving of gold and silverware.

Li Jing was originally a Confucian general. After putting on the glasses, although the sharpness of his eyes was somewhat restrained, the elegance of his eyes was even stronger, which surprised Li You.

Since there were no lenses, Li Jing didn't feel too much after wearing it. Instead, he was not used to it because there was an extra thing on his head.

Li You came back to his senses and said apologetically, "Mr. Wei, you just need to get used to this thing for a while. In the future, reading and writing will definitely be better than using a magnifying glass."

Li Jing nodded. Although this thing is a bit uncomfortable, at least it is much more convenient to use without hands.

Li You was about to ask someone to take him for an optometry, but Li Jing shook his head.