Hearing Yuan Tiangang's words, not only Li Su and the others behind him were stunned, but even Li Yexu immediately stopped, took a few steps back and asked with a hesitant face: "Old god...... Hmm~ Yuan Daochang, what you said is true? ”

"Poor Dao never speaks!" Yuan Tiangang made a salute and said seriously.

"Daoist Yuan, can a person's physiognomy also change?" Before Li Yexu could speak, Li Jingye next to him hurriedly asked.

After hearing this, Yuan Tiangang explained with a smile: "The so-called physiognomy is actually the appearance of a person's vitality, so if the luck changes, the person's physiognomy will also change accordingly, but this change is very small, and it is difficult for ordinary people to see." ”

Hearing Yuan Tiangang's explanation, the look of hope on Li Yexu's face increased greatly, and he immediately stood up and asked the other party to help him look at his face. Cheng Huailiang and Li Jingye also surrounded him, although Li Su didn't believe it, it was related to Li Yexu's future, so he was also very interested, and stepped forward to hear what Yuan Tiangang had to say?

I saw that the other party looked at Li Yexu carefully, and at the same time, the fingers of his right hand were quickly calculating. During this period, Yuan Tiangang's face was very solemn, it seemed that this kind of calculation was very brain-consuming, and in just such a short moment, a slight sweat had already appeared on his forehead.

"Sure enough!" In the end, Yuan Tiangang let out a long breath, and said a little tired and helpless, "Li Gongzi, don't worry, your face has indeed changed, as for Wei Guogong, Poor Dao will naturally explain!" ”

As soon as the nervous Li Yexu heard the other party's words, he immediately jumped up happily, Cheng Huailiang and Qin Huailiang were also happy for him, and beat him a few times excitedly around Yexu. But just when they were happy, Li Su found that Li Jingye also walked up to Yuan Tiangang with a worried face, and just wanted to speak, but saw Yuan Tiangang speak again: "Don't worry about Jingye Gongzi, I gave you the approval of the army at the beginning, but now you are the same as Li Gongzi." The physiognomy has long since changed. And in the future, it will be the order of the generals who will expand the territory. ”

Cheng Huailiang and the others were excited, and Yuan Tiangang's voice was not high, so they didn't hear it, but Li Su, who had been paying attention to this, heard it clearly, especially when he heard Yuan Tiangang say that Li Jingye was killed in the army, the surprise in his heart was beyond measure, because as far as he knew, Li Jingye was indeed because he opposed Wu Meiniang, and then rebelled. As a result, he died in the chaos.

"It seems that this old god stick still has some ability, and it doesn't all rely on people, is there really such a magical face art in this world?" Li Su muttered to himself. After Li Jingye heard that his fate had also changed, he immediately transformed into the second Li Yexu, and he was happy to jump and jump, but he was different from Li Yexu, Cheng Huailiang They didn't know that Li Jingye still had the criticism in the army, so they were 'excessive' excited about him. I thought he was the brother-in-law of karma. I'm happy for my uncle.

After venting his excitement, Li Yexu did not forget to thank Yuan Tiangang, after all, he still had to rely on the other party to convince his stubborn grandfather. It just so happened that Li Su had the best chef and wine here, and Yuan Tiangang was his guest, so Li Yexu also borrowed flowers to offer Buddha and invited Li Su to set up a banquet, and several people entertained Yuan Tiangang well.

In fact, because of Yuan Tiangang's original criticism. has made Li Yexu suffer for so many years, if he is replaced by another person, it is estimated that it will be difficult to forgive Yuan Tiangang on the spot. However, Li Yexu has always been a heartless character, no matter who he holds grudges against, he fought to the death just now, and he may call you a brother and sister in the next second, and Li Su and they all know this. Even everyone appreciates him the most.

Li Yexu and Li Jingye are the best drinkers among the people, but maybe because they are too happy, these two people almost drink wine as white water today, and they don't refuse to come, whoever respects them drinks, and the result is that Li Su and them succeed once, and the banquet is only halfway through, and these two people are all lying on the table and getting drunk.

After the banquet, Cheng Huailiang and Qin Huaiyu took the two drunks out and sent them back to their homes respectively, Yuan Tiangang just came back today, and he had something to find Li Su, so he stayed in his house that day. After the banquet, Li Su and Yuan Tiangang came to their study and asked everyone to step back, then they smiled and said: "Daochang Yuan, why did you come to Chang'an quietly, I didn't prepare in advance, and I almost let Ye Xu collide with Daochang, which is really rude!" ”

"Hehe, Your Highness is serious, Poor Dao is just an idle cloud and wild crane, as His Royal Highness, where is it still used to prepare. As for leaving Dengzhou, firstly, he was poor and loose, and he did not like to stay in one place for too long, and on the other hand, he was entrusted by the apprentice to report the problem of the steam engine to His Highness. Yuan Tiangang felt that Li Su seemed to be much more polite to him today, but he had already been a pampered character, so he didn't have anything special to say, and still said with a smile.

As soon as he heard that the other party was here to report to him about the steam engine, Li Su suddenly came to his senses, last time in order to solve the problem of steam engine leakage, he sent someone to Chang'an to take away a lot of fig tree gums, now I don't know how the effect is? At the moment, he asked a little eagerly: "Daochang Yuan, what did Yifan say, how is the steam engine now?" ”

"Your Royal Highness, the glue of that fig tree is really good, but in terms of wear resistance, it still can't meet the requirements." The first half of Yuan Tiangang's sentence made Li Su happy, but the second half of the sentence was a basin of cold water, fortunately, he hadn't finished speaking, and the following news finally made Li Su feel better.

"However, although the gum does not meet the requirements, but there are also some effects, after a sail of improved steam engine, plus sealed with gum, the maximum power can reach about five horsepower, but because the gum is easy to wear, so this maximum power can not be maintained for too long, and generally can only be maintained at about three horsepower." Yuan Tiangang still said unhurriedly. The horsepower and power he said were all after the invention of the steam engine, Li Su introduced new terms into later generations, in addition to the craftsmen involved in the design of the steam engine, only Li Su could understand the entire Tang Dynasty.

"Three horsepower is a bit less, but it's a good result to be able to triple the power in a short period of time." Although Li Su praised in his mouth, his brows still couldn't help frowning, it is now the initial stage of the steam engine, so increasing the power by three times seems to be a lot, but it is actually not a difficult thing, the more you increase the power, the more difficult it is.

Yuan Tiangang has seen all the states of life in his life, and he naturally knows what Li Su thinks in his heart, and he still said with a smile: "Your Highness, don't worry, Poor Dao came to Chang'an 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 Su asked impatiently, and at the same time thought to himself, this Yuan Tiangang is good at everything, he just likes to sell Guanzi, why don't you finish talking about it all at once?

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

In the era of the Tang Dynasty, compared with Confucianism and Buddhism, the influence of Taoism is not weak at all, and even if the power in the Taoism is gathered, the influence of Buddhism and Confucianism is only stronger than the weak, but the Taoism has one of the biggest shortcomings, that is, there are many sects, large and small schools are at least more than a thousand, although the doctrine of each family is derived from Lao Tzu's Tao Te Ching, but the Tao Te Ching is broad and profound, each person has their own understanding, and the developed schools of thought are also varied, and the disciples in the school have their own strengths.

It is precisely because of this that Daomen is actually more like a place where hundreds of schools of thought converge, and there are all kinds of talents in the door, such as Sun Simiao, who studies medicine, Li Chunfeng, who plays mathematics, Yuan Tiangang, who is engaged in face-to-face, etc., in addition, because Taoism is prevalent in alchemy, gunpowder is the first invention of those practitioners who are not afraid of death, and in the process of alchemy, Taoist priests have accumulated a lot of chemical and physical knowledge, and have made a lot of strange things, even Li Su, a later generation, can not understand. Therefore, when Yuan Tiangang encountered the problem of gum abrasion resistance, he thought of his peers in the Daomen and asked them to think of a way.

After Li Su heard Yuan Tiangang's thoughts, he was also very appreciative, but when he heard the abrasion resistance of the gum, a flash of inspiration suddenly flashed in his mind, he remembered that he had learned in the chemistry textbooks of later generations, in the production of rubber, it seemed that it was to increase the wear resistance of rubber, so something must be added to the rubber, but unfortunately, no matter how Li Su was, he couldn't remember what that additive was?

Although the additive is added to the rubber, if it is added to the gum of the fig tree, I don't know if it will have an effect? But that's always an opportunity, after all, rubber is also a gum to put it bluntly, so that additive is likely to work on other gums as well.

But everyone has a problem, that is, the more anxious they are, the more they can't remember. Li Su almost thought about his head, but in the end he still didn't have a clue, he hated it at the moment, why didn't he study hard at the beginning, and now he finally realized the taste of hating less when the book is used?

Seeing Li Su's anxious sweating appearance, Yuan Tiangang wanted to ask several times, but was stopped by Li Su. Finally, when he finally lowered his head in frustration, Yuan Tiangang said: "Your Highness, as soon as Poor Dao entered Chang'an, I heard that His Royal Highness was preparing for the military academy, and when I was in the city, I also met Sun Simiao and Sun Daoyou, and I heard him say that His Royal Highness is going to set up a Datang Medical College, which is dedicated to the promotion of medicine. ”