After listening to Li Xiu's description of the Americas, Li Chengdao suddenly found a problem, that is, he did not mention the exchanges between the Tang Dynasty and the Americas at all, and there were Kunlun slaves in Africa, but he had never seen anything in the Americas, let alone heard others mention it, so he asked if he had ever been to the Americas. Pen % fun % Pavilion www.biquge.info

Li Xiu was also stunned for a moment when he heard his question, and suddenly looked up and suddenly found that Princess Pingyang was also standing outside, the two looked at each other, and they both saw a little hesitation in each other's eyes, I don't know if I want to tell him that the bearded guest is going to America?

"There was a man who learned about the Americas from me, and he was going to go there to take a look and calculate the time, but he didn't know if he had set off now?" Li Xiu thought for a moment and finally spoke, although he concealed a lot of key information in his words, it was not a lie.

"And when will this man come back?" When Li Chengdao heard that someone really went to the Americas, he asked excitedly.

"I can't say for sure, after all, I don't even know if he's already set off now, but I guess he should be back next year at the latest, right?" Li Xiu finally said with some uncertainty, no one can predict the risks at sea, if the bearded guest goes to the Americas smoothly, he may come back in a few months, but if he encounters any disaster, he will probably never come back.

After this chat in the afternoon, Li Chengdao was also impressed by Li Xiu's profound knowledge, and finally in addition to overseas affairs, he also asked Li Xiu some questions such as astronomy and geography, which Li Xiu also had to answer, after all, the questions asked by Li Chengdao were not very difficult, such as the reason for the lack of the moon, the trend of the Central Plains, etc., are all very basic common sense, but there are many aspects involved, Li Xiu also tried his best to explain to him, which also made Li Chengdao have a feeling of sudden enlightenment.

The more he talked to Li Xiu, the more Li Chengdao had a feeling of hating each other, but unfortunately it was getting late at this time, and if he didn't return to the city, the city gate would be closed, and Chang'an City was subject to a curfew, and he was absolutely not allowed to walk on the street at night, even if he was the king of the county, he would be restricted, so in the end he could only say goodbye to Li Xiu and Princess Pingyang.

Li Xiu and Princess Pingyang stood outside the door, watching Li Chengdao's small figure leave accompanied by the guards, but the mood of the two was very different, Princess Pingyang was very happy to get together with her nephew for an afternoon, but Li Xiu was secretly sighing, no matter how good the child in his eyes was, I am afraid that he would not be able to escape the arrangement of fate in a few years.

Until this time, Princess Pingyang suddenly thought of the telescope, and just wanted to ask Li Xiu at the moment, but she didn't expect Li Chengdao, who had not gone far away, to suddenly turn around and run towards them, and after a while, she ran to Li Xiu out of breath and said, "Li ...... Li Saijiu, if I have the opportunity in the future, can I still ask you questions? ”

Li Xiu didn't expect Li Chengdao to come back and ask him this question, and he couldn't help but be stunned for a while, and then smiled and said, "As long as the county king is free, of course there is no problem!" ”

"Thank you Li for the wine! Goodbye, aunt! When Li Chengdao heard Li Xiu agree, he also showed a bright smile at the moment, and then saluted Princess Pingyang, and then ran away happily.

Watching Li Chengdao leave again, Princess Pingyang also showed a knowing smile, and then she had the opportunity to ask Li Xiu: "Li Xijiu, just now Qi Niang taught me to use those lenses, I wonder if that telescope can be used in the military?" ”

Li Xiu knew that Princess Pingyang would definitely ask this question, and at the moment he smiled slightly: "Princess, there is no problem with the telescope being used in the military, you only need to fix the two lenses, wait for me to draw a sketch, and the princess will take the lenses back and let the craftsmen in the palace make them." ”

"Great, with this thing on the battlefield, the general may discover the enemy situation in advance, so as to launch the fighter before the enemy, don't underestimate this, sometimes a little opportunity may determine the outcome of a war!" Princess Pingyang heard Li Xiu's affirmative answer, and muttered to herself excitedly at the moment.

Looking at Princess Pingyang's excited appearance, Li Xiu hesitated for a moment at this time, and finally suddenly said: "Princess, you will definitely report the telescope to the imperial court, but don't say that I invented it!" ”

"Why is this, if the telescope is implemented in the army, it will greatly enhance the military strength of our army, wouldn't it be a pity if such a great achievement is not done?" Princess Pingyang asked with some confusion at this time.

"Hehe, it's because the credit is too great, so I don't want it, I'm worried that if the court recruits me as an official, I'm afraid the princess will be difficult to stop, does the princess want me to leave?" Li Xiu smiled at this time and said, strictly speaking, he is now a subordinate official of the princess's mansion, and Li Yuan has the right to recruit him into the imperial court as an official, which is also the last thing Li Xiu wants to see.

Hearing the last sentence, Princess Pingyang couldn't help but blush, she was unwilling to let Li Xiu leave her no matter what, especially when she was used to this kind of leisurely life, she occasionally came to talk to Li Xiu, although it seemed dull, but the relationship between the two was getting deeper and deeper.

"Well, I see, but even if I don't say it, I'm afraid my father will be able to guess that you made the telescope." Princess Pingyang was shy for a while, and finally whispered, after all, Li Xiu had designed a waterwheel before, and Princess Pingyang did not have other particularly conspicuous talents, so as long as she reported the telescope to the imperial court, Li Yuan would definitely guess that it was Li Xiu's credit.

"Haha~, you know it, anyway, I don't admit it, the court can't force the credit on my head." Li Xiu didn't care about it, now he is no longer the unmeritorious Pingtou common man before, but the sacrificial wine of Princess Pingyang's mansion, with Princess Pingyang here, it is impossible for the court to transfer him away without any reason, Princess Pingyang reacted at this time, and said "cunning" to Li Xiu with a smile, but she finally put her mind at ease.

It was getting late, Li Xiu left Princess Pingyang to eat at home, anyway, it was not the first time, Princess Pingyang also readily agreed, she also had some questions about the telescope and wanted to ask Li Xiu for advice.

"In fact, the telescope can not only be used for military purposes, but also for observing astronomy, such as the moon in the sky, if you use a telescope with a magnification of enough, it will definitely surprise you, and it can also be used for navigation, and there is even a microscope derived from the telescope, which can see extremely small things, and these uses can be excavated one by one in the future." Li Xiu explained with a smile that dinner was not ready yet, so he chatted with Princess Pingyang.

"I didn't expect these seemingly ordinary lenses to be so useful when combined!" When Princess Pingyang heard this, she couldn't help but reach out and touch the lenses in the box, in contrast, when she learned that the glasses Li Xiu wore before were purely for good looks, she couldn't help but feel a little wasteful.

"Hehe, the role of these lenses is much more than that, for example, the role of a single lens is also very large, such as this concave lens, which can be used by people with myopia to improve their vision." Li Xiu smiled and picked up a pair of lenses and said, in his previous life, he had nearly 500 degrees of myopia, and he usually couldn't do without glasses at all, but fortunately there was no such problem after crossing, which was also an accident.

"What is myopia?" Princess Pingyang asked if she didn't know much about this new term.

"It's that some people may read too much, or it may be because of other reasons, resulting in poor eyesight, and they can't see clearly when they are far away, which can be called myopia in medicine!" Li Xiu patiently explained.

"I understand, it turned out to be a kind of eye disease, I have an imperial uncle who likes to read since he was a child, and he has eye diseases in his eyes, and he squints when he sees people, otherwise he can't see clearly, and no matter how much medicine he takes, he can't be cured." Princess Pingyang also said with a sudden expression when she heard this.

"Uh~" Li Xiu was also a little speechless when he heard Princess Pingyang's last words, myopia is an organic lesion, even in later generations, I have never heard that taking medicine can cure it, the only feasible thing seems to be to do laser surgery, otherwise I will have to wear glasses for a lifetime.

"Do these lenses have any other functions, Li Xianjiu, tell me a little more!" Princess Pingyang began to take the initiative to ask, she didn't expect these lenses to be able to cure diseases, it seems that the world is really big.

"Of course, princess, you must have also discovered that there are actually two kinds of lenses in the box, the one that is thick and thin around is called a concave lens, which is the kind that can treat myopia, and the one that is thick in the middle and thin around is called a convex lens, which is a lens that can ignite the velvet before, and it can also treat farsightedness, which is commonly known as presbyopia!" Li Xiu explained with a smile again.

"Presbyopia! Can it really treat presbyopia? Princess Pingyang suddenly became excited when she heard this, and even grabbed Li Xiu's arm, but then she felt that something was wrong with her, so she hurriedly let go and lowered her head with a blushing face.

"Yes, why is the princess so excited?" Li Xiu was also a little surprised at this time.

"Li Xianjiu doesn't know, my father has a very serious presbyopia, usually when reviewing the fold, close to the words on the fold can't see clearly, can only let the chamberlain take the fold back a little farther to see, after a long time will feel dizzy, which also makes him review the fold is very painful, sometimes the review is not finished and have to stay up late, if you can solve the problem of your father's presbyopia, presumably he will feel very relaxed!" Princess Pingyang said excitedly again, as a child, she naturally hopes to be able to do a little filial piety for her parents.

"I see, the princess's filial piety is commendable, I will definitely help the princess match the right reading glasses for Your Majesty!" Li Xiu immediately patted his chest when he heard this, Li Yuan is his future father-in-law, so he naturally wants to perform well this time. (To be continued.) )