Hearing Yuan Tiangang's words, not only Li Yan and others behind were stunned, but even Li Yexu immediately stopped and took a few steps and asked hesitantly: "Old God... Well~ Master Yuan, are you saying true?"

"I never lie!" Yuan Tiangang gave a Taoist tribute and said seriously.

"Master Yuan, can human faces change?" Before Li Yexu could speak, Li Jingye next to him rushed to ask.

After hearing this, Yuan Tiangang smiled and explained: "The so-called facial appearance is actually the appearance of a person's luck in his life. Therefore, if the luck changes, the face of a person will also change accordingly. However, this change is very small and it is difficult for ordinary people to see it."

Hearing Yuan Tiangang's explanation, the hope on Li Yexu's face increased greatly, and he immediately stood up and asked the other party to help him see his face. Cheng Huailiang and Li Jingye also surrounded him. Although Li Yan didn't believe it, it was related to Li Yexu's future, so he was also very interested. He walked forward to hear what Yuan Tiangang said?

The other party looked at Li Yexu carefully, and at the same time, the fingers on his right hand were quickly counting. During this period, Yuan Tiangang's face looked very serious. It seemed that this calculation was very brain-consuming. In just a moment, a slight sweat appeared on his forehead.

"It's true!" At the end of the calculation, Yuan Tiangang let out a long breath and said a little tired and helplessly, "Don't worry, Mr. Li, your face has indeed changed. As for Duke Wei, I will naturally explain it!"

When Li Yexu heard the other party's words, he immediately jumped up happily. Cheng Huailiang and Qin Huailiang were also happy for him, and punched him several times excitedly around Yexu. However, when they were happy, Li Yan found that Li Jingye also walked to Yuan Tiangang with a nervous look on his face. Just as he was about to speak, he saw Yuan Tiangang say again: "Young Master Jingye, don't worry, I gave you the comments I made in the army that died suddenly, but now you are the same as Mr. Li. Your face has long changed. And in the future, you will be the general who will expand your territory."

Cheng Huailiang and the others were excited, and Yuan Tiangang was not speaking loudly, so they didn't hear it. However, Li Yan, who had been paying attention to this side, heard it clearly, especially when he heard Yuan Tiangang say that Li Jingye was the fate of a desperate death in the army, his surprise was beyond words, because as far as he knew, Li Jingye did rebel because he opposed Wu Meiniang and then rebelled. As a result, he died in the chaos.

"It seems that this old charlatan is still a bit capable, not all relying on men. Is there really such a magical way of meeting each other in this world?" Li Yan murmured to himself. After hearing that his fate had also changed, Li Jingye immediately transformed into the second Li Yexu. He was happy that he jumped and jumped, but he was different from Li Yexu. Cheng Huailiang and the others did not know that Li Jingye had any criticisms in the army that died suddenly, so they were excited about him. They thought that he was Yexu's brother-in-law and was happy for his brother-in-law.

After venting his excitement, Li Yexu did not forget to thank Yuan Tiangang. After all, he had to rely on the other party to convince his stubborn grandfather. It just so happened that Li Yan had the best chef and wine here, and Yuan Tiangang was his guest, so Li Yexu borrowed flowers to offer Buddha and asked Li Yan to hold a banquet. Several of them treated Yuan Tiangang well.

In fact, because of Yuan Tiangang's criticism, Li Yexu suffered so many years, if it were another person, it would be difficult for him to forgive Yuan Tiangang on the spot. However, Li Yexu has always been heartless and does not hold grudges against anyone. He was fighting to the death just now, and he might be brothers to you in the next second. Li Yan and the others know this. Even everyone appreciates him the most.

Li Yexu and Li Jingye were the best drinkers among the people, but maybe because they were too happy, they almost drank wine as white water today, and they didn't refuse anyone to give them any respect. As a result, Li Yan and the others finally succeeded. After the banquet was halfway through, the two of them all lay on the table and fisted drunk.

After the banquet, Cheng Huailiang and Qin Huaiyu carried the two drunks out and sent them back to their house. Yuan Tiangang just came back today and had something to look for Li Yan, so he lived in his house that day. After the banquet, Li Yan and Yuan Tiangang came to their study and asked everyone to retreat. Then he smiled and said, "Master Yuan, why did you come to Chang'an quietly? I didn't prepare in advance, and I almost made Ye Xu run into the Taoist priest. It was really rude!"

"Haha, Your Highness is so serious. I am just a wild crane. As for your status, you can't even prepare. As for leaving Dengzhou, I am a casual person and don't like to stay in one place for too long. In addition, I am also entrusted by my disciple to report the issue of the steam engine to Your Highness." Yuan Tiangang felt that Li Yan seemed to be much more polite to him today, but he had long been a person of unfair favor and disgrace, so he didn't express any special expression and said with a smile.

When he heard that the other party was coming to report the steam engine to him, Li Yan suddenly became energetic. Last time, in order to solve the problem of steam engine leakage, he sent someone to Chang'an to take away a lot of gum. Now he didn't know how the effect was. He asked anxiously: "Master Yuan, what did Yifan say, what's wrong with the steam engine now?"

"Your Highness, the glue of that fig tree is indeed good, but it still cannot meet the requirements in terms of wear resistance." Yuan Tiangang's first half of the sentence made Li Yan happy, but the second half was poured on a basin of cold water. Fortunately, he had not finished speaking, and the following news finally made Li Yan feel a little better.

"However, although the gum does not meet the requirements, it also has some effects. After Yifan's improved steam engine, coupled with the gum seal, it can reach a maximum power of about five horsepower. However, because the gum is easy to wear, this maximum power cannot be maintained for too long, and generally it can only be maintained at about three horsepower." Yuan Tiangang said slowly. The horsepower and power he mentioned were all after the invention of the steam engine, Li Yan introduced new terms from later generations. In addition to the craftsmen involved in the design of the steam engine, only Li Yan could understand the entire Tang Dynasty.

"Although the three horsepower is a little less, it is a good result to increase the power by three times in a short period of time." Although Li Yan praised, his brows still couldn't help but frown. Now is the starting stage of the steam engine, so increasing the power by three times seems to be a lot, but it is not a difficult thing. The more you increase the power later, the harder it is.

Yuan Tiangang saw all the various aspects of life in his life, and naturally he could see what Li Yan thought at first sight, and said with a smile: "Your Highness, don't worry, I will tell you this time that this time, in addition to telling you about this matter, there is another very important thing to do, and this matter is also related to the steam engine."

"Oh, what's that?" Li Yan asked impatiently, thinking to himself that Yuan Tiangang is good at everything, he just likes to keep it in secret. Why don't you finish everything in one go?

"Your Highness, although the gum of fig tree is worse in wear resistance, we have tried countless materials before, and none of them are better than this gum. So this time I came to Chang'an, I wanted to find some friends from Taoism to help enhance its wear resistance. I think I am countless talented people in the Tang Dynasty, and I will definitely find a solution!" Yuan Tiangang said confidently.

In the Tang Dynasty, compared with Confucianism and Buddhism, Taoism had no weak influence at all. Even if the powers in Taoism were gathered together, the influence of Buddhism and Confucianism was only stronger than that of Buddhism and Confucianism. However, Taoism had one biggest disadvantage, that is, there were many sects, and there were at least more than a thousand schools of all sizes. Although the theories of each school originated from Lao Tzu's Tao Te Ching, the Taoism was profound and profound, and everyone had their own understanding. The sects developed were also diverse, and the disciples in the sect had their own strengths.

It is precisely because of this that the Taoist sect is actually more like a place where hundreds of theories gather, and there are all kinds of talents in the sect, such as Sun Simiao, Li Chunfeng, and those who play mathematics, Yuan Tiangang, etc. In addition, because Taoism is popular in alchemy, gunpowder is the first invented by those who are not afraid of death. In addition, during the alchemy process, Taoists accumulated a lot of chemical and physics knowledge, and created many strange things that even later generations could not understand. So when Yuan Tiangang encountered the problem of wear resistance of gum, he thought of his colleagues in the Taoist sect and wanted them to think of ways.

Li Yan also admired Yuan Tiangang's thoughts very much, but when he heard about the wear resistance of rubber, a sudden light flashed in his mind. He remembered that he learned in later chemistry textbooks. When producing rubber, it seemed that in order to increase the wear resistance of rubber, so something had to be added to the rubber. Unfortunately, no matter how Li Yan was, he couldn't remember what kind of additive was?

This made Li Yan very anxious. Although that additive is added to rubber, if it is added to the gum of fig tree, I don’t know if it will work? But that is always an opportunity. After all, rubber is also a kind of gum, so that additive may also work on other gums.

However, everyone has a problem, that is, the more anxious he is, the less he can't remember it. Li Yan was almost thinking about it, but in the end he still had no idea. He was very angry at the moment. Why didn't he study hard at the beginning? Now he finally realized the feeling of hating the little hell when he was using the book?

Seeing Li Yan's anxious look, Yuan Tiangang wanted to ask several times, but he was stopped by Li Yan. Finally, when he saw that he finally lowered his head in frustration, Yuan Tiangang then said, "Your Highness, as soon as I entered Chang'an, I heard that Your Highness was preparing for the military academy. And when I was in the city, I also met fellow Taoist Sun Simiao and Sun. He heard that Your Highness would set up a Tang Dynasty Medical College, which was specifically used for the promotion of medicine. Such a behavior of benefiting the people is really admirable. But I also have an idea from this and ask Your Highness to help you too!"
Chapter completed!