Jiang Tian didn't sleep well all night, in order to prepare the next day's lecture notes, he sorted out the messy textbooks in detail, except for literature and other content, he found that he had to teach those people the most basic mathematical knowledge first, otherwise everything else would be in vain. In the middle of the night, Xiyun walked to his window several times, but walked away without saying a word. Jiang Tian didn't know that the little girl was struggling in her heart, and he didn't know that Boss Zhao had been observing them in the other room. Early the next morning, Jiang Tian finally figured it out, how many of the young masters of those rich and noble families really like science? Even if there is, they won't be in their own cram school, so why bother with it, when the time comes, they can learn whatever they like.

He may not realize that only with this attitude is a qualified cram school teacher! Imagine how many of the dazzling variety of cram schools and improvement classes in later generations are selling dog meat on sheep's heads? Anyway, the student's learning situation is not linked to their own income, as long as you invite a few well-known teachers to come to the town, it is your child's own problem to learn well or badly. And for those students who don't really want to learn more real things, having a teacher like this is the best teacher. So the content of this first day of teaching was reduced to the outrageous process of doing ten practical problems! Liu Pervert, who came to join in the fun, didn't think there was anything wrong with this, but Tian Xuhai and Song Yi both thought that Jiang Tian was deliberately embarrassing himself, do you think you bragged about him in front of your classmates, and in the end you are at this level? Don't look at our family background is quite prominent, but in front of these classmates, at most they are not equal, and these dumbfounders don't care what secrets you have. So those sons easily mixed up until the end of class on the first day, but these people did not disperse with them, but went to the nearby Flower Street Willow Lane to continue "reviewing" in twos and threes, which made Jiang Tian very suspicious of their motives for coming here to tutor.

So on the second day, when she saw that the questions were still ten practical questions, she couldn't sit still. Song Yi raised the teacup and poured two sips of tea, their classroom was selected in the lobby of the teahouse, who made this place small and unable to accommodate so many people, and claimed that it was chartered here, and it was not open to the public during the day, anyway, the "tea money" given to Jiang Tian for a day definitely exceeded the profit of ten days here, Boss Zhao could not prevent them from occupying the lobby from any aspect, and the only person who really came to drink tea here was the initiator, so he took advantage of the other students to do the problem, Song Yi seemed to be casually chatting with Jiang Tian.

"Brother Muhua!" Now that you already know Jiang Tian's words, you can still be closer to this name: "A few days ago, your model was amazing, but the little brother was stupid and didn't know how the virtuous brother knew these truths?" ”

Jiang Tian chatted with him when he had nothing to do anyway, but the place to hide should be carefully considered: "I'm ashamed to say that when I was studying in the countryside, I heard that a person named Galileo made a clairtelescope in Tessie, which can be used to observe the movement of the stars in the sky, so it is not me who proves that the earth revolves around the sun." ”

When Liu Pervert heard this, he also became interested: "I have also played with this clairvoyant mirror, but I can't see the stars in the sky!" ”

"That's because your magnification is too low." Jiang Tianhun continued indifferently: "Most of the clairvoyant mirrors used in the army are bought from Xiyi, and they are only magnified by five or six times at most, if you want to see the Moon Palace, it will be at least twenty times, as for watching the Cowherd and the Weaver Girl...... In your lifetime, you don't have to expect extravagantly. ”

"Huh?" The pervert was a little frustrated: "I think those clairvoyant mirrors are magical enough, I didn't expect there to be better, so isn't it those Hu merchants who deceived me?" ”

"Not really!" Jiang Tian replied to him casually: "The countries of Europa have been fighting endlessly, so this clairvoyant mirror belongs to military control materials, and it cannot be easily lost to the enemy, and those merchants naturally can't get the best things, and as far as I know, only Galileo can polish more than twenty times the lenses in this world." ”

Song Yi was secretly surprised in his heart quietly, just looking for a topic to chat with, just to let those guys who are doing the question know that you are not a wasted person, how can this casual remark hit the nail on the head? The Holy Lord did issue a request to the Academy of Sciences to develop a large-magnification telescope, which was not only a need for astronomical observations, but also a guarantee for winning the war. I think that if the strange soldiers who landed from Dagukou back then had a telescope in their hands, they would not have let Dolgona escape from the door, then again, every time Jiang Tian said that it was a Semu merchant who told him about his overseas experience, what kind of caravan could bring so much Xiyi insight to a rural Xiucai?

Song Yi is not the only one who has this question, the handsome young man with red lips and white teeth among the people who is doing the question is also secretly observing him, it is strange to say, these noble sons usually know each other, and getting together in twos and threes is also the title of benevolent and virtuous brothers, but there is no one around, let him occupy a table by himself, not to mention, others still have a feeling of respecting him, if it weren't for the slightly bulging throat on his neck, Jiang Tian almost thought that a Xibei was mixed in. After thinking about it again, don't let the inquisitive guy on the other side of the door think of this idea, otherwise your small shop will definitely be crowded with "students" who come to visit.

Song Yi didn't see that Jiang Tian was distracted, so he then asked: "If we also improve the grinding process, can we make high-magnification lenses?" ”

Jiang Tian noticed those modern words in Song Yi's mouth, but he was not surprised, after all, the emperor is a time-traveling person, and his grandfather is still Song Yingxing, it would be strange if he didn't understand some technical terms: "It's not that simple, grinding lenses is only the last process of making a clairvoyant mirror, the real difficulty lies in making high-level optical glass, and then having a clear understanding of light refraction, so as to make better lenses, as for grinding...... Hand grinding has no future. ”

This answer made Song Yi's heart even more shocked, he knew that the biggest obstacle in the development process of the Academy of Sciences was the lack of purity of the glass, and now he could only entrust those ocean-going trading ships to bring very few high-level glass from Europa for trial production, which was not only expensive but also unstable from the source, and sometimes waited for a year or two to wait for the news that the other party was robbed by pirates or sunk in a storm. If this Jiang Tian can really have a way to solve this problem, wouldn't this be a merit for the present and a thousand years of benefit?

Thinking of this, Song Yi stood up almost without thinking, and bowed deeply to Jiang Tian with a leisurely face: "The ancestor of the family has worked hard for the matter of making mirrors, and I don't want Brother Tai to have such knowledge, so the student has the courage to ask Brother Muhua to go out of the mountain to help!" ”

This change made everyone present stunned, although this Song Yi is not a noble in the family world, but his grandfather is not only a saint, but also the president of the Academy of Sciences and the dean of the Imperial Academy, the convenience of being in charge of the world's scholars makes his status very transcendent, plus he is friendly with the Tian family and the son of the Liu family, so no one dares to accept his great courtesy, and few young people can let him call himself a student. I only listened to them talk for a while, how could there be such a dramatic situation?

Jiang Tian sat there and watched Song Yi, who refused to straighten his waist, motionless, he was not a big shelf, but he was thinking about countermeasures quickly in his mind, whether it was making glass or making telescopes, he had no relevant professional knowledge, at most, he had seen a few words in the textbook, but looking at the other party's posture, it seemed that he didn't want to let go of himself, and it was okay to talk about it, if he really went into battle in person, wouldn't it be exposed?

"Why is Brother Song Xian like this?" He also stood up and helped Song Yi up: "Foolish brother, I'm just hearsay......

Before he finished speaking, Liu Pervert hurriedly interjected: "Eh! Brother Muhua doesn't have to be humble, I have often heard the dean say that if you are willing to go out of the mountain, then there is no position in the Academy of Sciences that you are not qualified for! Besides, no one forced you to make a clairvoyant mirror, you just try it on the face of Boss Song, if you can succeed, it will be good, and if you don't succeed, you can do your best. ”

Jiang Tian heard that the pervert was reminding him, don't look at Old Man Song who promised you to settle Xiyun's hukou, but this matter has not been done yet, and even if it is done, you owe someone a favor, do you need to say what to do?

He had no choice but to agree: "Okay, foolish brother, I'll try it, if it doesn't work, there is nothing I can do about it." ”

When the students dispersed and only Jiang Tian was left in the store, he sighed slightly, he had never wanted to swagger, but various things forced him not to swagger, and he was also a mouthful, knowing that a few words could attract attention, but he still couldn't help but show off. Maybe this is an opportunity for them to know that they are not omnipotent, and they will not be pestering themselves anymore, right? Just waiting for Xiyun to have a legal identity, he persuaded Boss Zhao to sell his small shop to find a place to retire, and he quickly hid back to his hometown to be a small landlord. If he really let the seniors in the Golden Palace find out, will he kill himself to keep the secret? If this is the case, then you must be prepared to abscond overseas.

Jiang Tian didn't know, the current majestic emperor His Majesty didn't have time to care about his junior, not to mention the usual official affairs can make people anxious, the most headache at the moment is actually that Confucian students all over the country are making trouble, they don't know where they heard that the country is preparing to completely abandon the scientific examination, which is equivalent to cutting off their only way to advance, so the yamen in various places have written to ask the imperial court to give an explanation, after all, most of those magistrates are also from the imperial examination, they can't help but care about this problem. If this matter is not handled well, it may be a nationwide riot. Now even if he knows that there is another traverser in the people, he can only postpone this matter for the time being, who is lighter and who is heavier than a person and the whole country?

Make a telescope! This question has been lingering in Jiang Tian's mind, it should be said that this is the standard bridge in many novels, but not only those novels are written vaguely, but I usually don't pay attention to how difficult this thing is to manufacture, and various materials and processes in later generations make the price of telescopes more affordable, and spending dozens of yuan to buy something to coax children to play with is much more advanced than this era. I am not a talent in this area, how can I help Old Man Song improve the telescope? Besides, this pervert is not a thing, I don't want to agree with you to use Xiyun to pressure me, and when her account is implemented, I will run away immediately, and then see what you use to threaten me.

He has been thinking about this problem all day long, so the shopkeeper is very incompetent, and it is common for him to forget to serve tea to guests, and Boss Zhao saw that his state was really not suitable for work, so he took the initiative to persuade him to rest, and it was better to let Xiyun take over him. Jiang Tian actually didn't want to let that girl do this kind of work again, this is different from himself, since he pulled people out of the brothel, he would be responsible for the end, if he just changed from serving a rude girl to serving tea customers, what was the difference from before.

The guests also noticed that Jiang Tian was a little absent-minded, and then a few regular customers jokingly said, "Xiucai, this is thinking of a new book, right?" It's been a long time since we've heard you say a paragraph! ”

As long as someone starts, there is absolutely no shortage of coaxing, so a group of idlers have asked him to perform on stage, Jiang Tian looked at the sky, there is still a period of time before Mr. Liu comes to the book, even if he is entangled in the telescope, it will not help, maybe it is good to change his mood and relax. So after just a little groaning, I agreed to this request. Everyone didn't expect him to agree so happily, but it was a little surprising, at this time there were already a lot of vendors selling snacks here to do business, and when they heard him say this, they were not busy selling, and they crowded at the door one by one and waited to listen. At this time, no one noticed that a dirty boy ran over quickly, and hid in the crowd to listen to cross talk. Even if you notice, you won't take it seriously.

Jiang Tian still stood up to the table, thought about what to say, and a few days ago, he sorted out the cross talk that he could still recall, but most of them had already been said, and after thinking about it, he finally found one that he hadn't said: "The joke I said today, that's not the current thing, when did it happen?" It's been a hundred or two hundred years......"

This time he is also talking about the classic "Three Dangers in the Day", because the audience is already familiar with his performance routine, so when he said that the county official is looking for three special people, quick temper, chronic and greedy, just such a foreshadowing, it made the audience laugh for a while, as for the development of the back, it will be impossible to clean up, especially when Jiang Tian imitates the chronic son who is not in a hurry for anything, just like a turtle lying on a stone and slowly probing his head, people are even more happy.

In short, the performance was still very successful, and the audience who had not listened to cross talk for a long time was satisfied, and Jiang Tian also temporarily relieved his depressed feelings, but he didn't have to relax for long, and a turtle slave with a green hat ran to him and handed him a note.

"Son, my girl said, please go upstairs opposite and see you!" The turtle slave smiled and said in a low voice: "The girl also said that if you don't want to appreciate the light, as long as you read the note, you will definitely go to the meeting!" ”

Jiang Tian opened the note and looked at it, only one sentence was written on it: "The melodious sound of the flute is like a heavenly sound, a song stirs the heart, if you want to explore the secrets between Linglong and Xiyun's master and servant, there may be hope tonight." ”

Jiang Tian quietly crumpled the note, then looked at the turtle slave and said, "You go back first, and I'll be there later." ”