The visitor just glanced around the teahouse, and then walked up to Jiang Tian as if no one was around, and respectfully made a gesture according to the disciple's etiquette: "Dare to ask if Mr. is it inconvenient to teach today?" ”

Jiang Tian has been paying attention to this student, and since the first day he came here, he seemed out of place with other classmates, because even if he was an elder in the family, he would generally have three or five friends, but this one was not only handsome, but also quite serious in completing his homework, but he seemed to be rejected by others who did not fit in. Today's incident confirms some speculation, and his status is clearly higher than everyone here. So Jiang Tian didn't dare to hold it up, and he also returned the salute.

"It's okay today."

When this boy heard this, he immediately pushed out the little boy who was hiding behind him: "This is a student's cousin, can you listen to the fact that you have come to Beijing to visit relatives and have nothing to do recently?" Naturally, the tea money is paid. ”

In fact, Jiang Tian was thinking about it just now, I haven't seen these boys come to class and bring their families, there are quite a few scholars, little girls and the like. Looking at this child again, he just wore a silk woven silver thread, and the pattern of the costume was very simple, but the materials were quite elegant. Compared with his own student, the spirit of wealth has not diminished at all. He looked around just now and looked very curious, but after being pushed in front of people, he immediately restrained his naughty temperament, and he was not timid in the face of his stranger. It seems that his guess is completely correct, and only a real wealthy family can raise such a child under the deep accumulation, in contrast, Liu Baokai definitely belongs to the nouveau riche type.

"As long as you don't disturb the class, Childe will be bothered, and the tea money will be counted." Jiang Tian thought that he wouldn't explain anything to this kid anyway, and there would be no reason to accept money from others.

Hearing him say this, Xin Yue, who was teased and embarrassed just now, calmed her mind, she thought that she knew something about the number one young master in Beijing, but she had never seen this person, and it seemed that her status was far superior to that of Liu Baokai and other officials. Thinking about it carefully, combined with age and appearance, it seems that he has guessed the identity of the other party, since even this kind of character is very respectful to Jiang Tian, then he must be able to fish in troubled waters. So he also walked in front of Boss Zhao in a similar way.

"Uncle, you took my tea money just now, and now you haven't drunk a cup of tea, concubine...... Is it possible to stay here as well? "I almost said it well.

Old man Zhao really wanted to throw the silver one or two back, you big girl have nothing to do here, what's the mess here? As long as you stay here, these energetic lads won't be able to keep to themselves. It's just that this matter is no longer a simple business, and it depends on Jiang Tian's meaning whether to stay or not, so the old man glanced at Jiang Tian directly. This made him mistaken, Jiang Tian thought that the old man felt sorry for the one or two silvers, so he asked him to find a way.

"In that case, there are still good tea leaves in the backyard, childe ......" Jiang Tian felt that his name was quite awkward: "Just go to the backyard and choose it yourself." ”

This is actually equivalent to telling her that she can listen if she wants to, but for the sake of stability and unity, please go to the backyard and be with Xiyun, at most hide behind the curtain and don't trouble me. Liu Baokai and the others were also relieved when they heard this, as long as they could separate men and women, they could ensure that there would be no big mess on their side. But in this way, this morning he wanted to bring Jiang Tian back to the Academy of Sciences, so as soon as he and Song Yi were together, Comrade Pervert decided to ride back by himself to report the news.

After tossing all morning, now that the delivery is quiet, Jiang Tian breathed a sigh of relief. Then he looked at the students who were still a little impetuous, and said, "You may think that coming here is just a mess, and anyway, I don't have anything real to teach as a country roughman." In fact, you don't know, mathematics is the mother of science, all things in heaven and earth, all universes and desolations cannot be quantified by numbers, and if you don't understand mathematics, you can't get a glimpse of the truth of the world, so I have been letting you practice math problems, and today I will do a few arithmetic problems first. ”

Originally, this is a time-consuming excuse, although it is the truth, but anyone who listens to it is like finding a fig leaf for themselves. So the restless of the people who listened to the lecture spoke loudly behind the curtain of the door: "Since the gentleman said that mathematics is the supreme principle of all things, why don't you explain one or two so that I can wait to peek into the door?" ”

The beautiful woman spoke, can the boys not coax? Many people were clamoring for Jiang Tian to change the subject. Jiang Tian thought to himself, I don't want to provoke you, it's because of this reason, why don't you do the exercises? This is good, even the son with the highest status has his eyes shining. Thinking about it again, people come here every day to spend a couple of silver to do a few problem-solving, which is indeed a bit suspicious, so Jiang Tian just sighed: "What do you want to hear?" ”

He relented, you can ask questions, this is difficult for this group of gentlemen, if you ask them what to play and eat for a while, then you will definitely get all kinds of answers, but as for this scientific question...... How many do they care about? It turned out that the man behind the curtain spoke.

"A few days ago, Mr. said that the earth is a round ball, so why don't you use mathematics to prove why people standing at the bottom of the ball will not fall?"

"Good topic!" Song Yi couldn't help but applaud loudly.

Now Jiang Tian is embarrassed again, how can such an esoteric thing be explained clearly in a few words and a few arithmetic problems? Even a simplified proof has to be cited from high school knowledge, can you guys who can't even reach the elementary school level understand? But the words have already been spoken, so you can't just take it back, right? It's not that I care about face, but I don't want to dismiss the possibility that these people like science. After thinking about it for a long time, just when everyone thought that he had nothing to do, Jiang Tian beckoned to Song Yi.

"Next, you help me make a real yàn."

I saw that he took off the thin cotton curtain of the door, revealing the heart moon behind him, and then found a fist-sized stone, put the stone in the middle of the curtain, and the four corners were pulled up and straightened by him and Song Yi in the air, even if the two of them flattened it hard, but due to the gravity of the stone, the position of the stone in the middle of the curtain was still dented. Then he asked Xinyue, who had made a bad idea, to find a sleek pebble and throw it on the curtain at random, and then everyone saw that the pebble rolled twice on the cloth and sank to the position of the big stone in the middle.

"Why do you think the small stone stays next to the big one?" Jiang Tian asked all the students rhetorically, in fact, he was asking Song Yi and Xinyue.

"Isn't that obvious?" Song Yi was a little confused: "The big stone is low, and the small stone will naturally roll there." ”

"Yes!" Jiang Tian put down the real tool: "But who of you has ever wondered why the water flows to a low place?" And why do all objects stay on the ground? No matter how high you throw a stone, it will eventually fall, as if there is a force pulling it back to the earth, so I call this force gravitational ......."

Jiang Tian spent a morning roughly explaining what the law of gravitation is, and it is actually only one sentence to sum up, there is a gravitational force between any object in the universe, and the magnitude of gravity is only related to the mass and distance of the object. The real yàn he uses is easy to understand, and he also lists the formulas of mathematics, in which the letters are replaced by Chinese characters. But it is such a simple question that cannot be simpler, so that these people who have no scientific foundation sound tantamount to listening to heavenly books, Xinyue keeps asking the meaning of terms such as: mass, particle, square, positive and negative ratio, etc., as for Song Yi, he has no time to ask questions at all, he can't just record these things. Those who are confused may not understand the meaning of such a simple formula, but they know that mathematics can indeed calculate all kinds of problems that people can't imagine. Even if those guys who come to mess around are not easy to learn, they are also impressed by all kinds of intuitive realities, and they know that the original class can be taught like this. As for the respected son and the cousin he brought, they were also impressed by this explanation, and after class, they took the lead in saluting Jiang Tian before packing up their things and leaving. Even if others were reluctant, they could only bow their heads at this time and admit Jiang Tian's status as a teacher.

As for Jiang Tian, who was tired of stinky sweat, he didn't notice this change in status at all, thinking that this was just talking about the law of gravitation in classical physics, not only did almost everyone not understand it, but even Song Yi and Xinyue only seemed to understand it, this was still on the basis of omitting a large number of complex variables, and explained the principle of star motion and ocean tides in a superficial way, if I talk to you about the gravitational theory in the theory of relativity, you don't think I am a nonsense liar. In the words of a Western scientist, this Chinese defeated all the Greeks who tried to explain nature with philosophy...... It sounded like a tongue twister, but this was something that only happened after Jiang Tian's death, so he didn't know about it all along. One of the most popular phrases in the West during his lifetime was that God was punishing the stupid Holy See and giving birth to an apostle with the truth in the far East.

Xinyue went back with shock and confusion, believing that what she had learned today was enough for her to digest for a long time. Song Yi, who was left in the teahouse in a daze with class notes, has been standing at the forefront of the Chinese scientific community, he thought that he was just lacking some whimsy, but after a few months of contact, he found that the original self-righteous knowledge in front of Jiang Tian was just ridiculous and vulnerable garbage. Not to mention himself, even those Western missionaries may not be able to beat Jiang Tian in theoretical knowledge, and his explanation is simple and there are no obscure Western-style mathematical formulas, which makes people want to stop listening to it. This ability to simplify the complex is unparalleled in the world, and even so, he can only understand the skin, which shows that the depth of this man's mastery is already extraordinary. In fact, how did he know that any popular science program in the 21st century is better than what Jiang Tian said, but those are all based on the education of modern human beings, and for people in this era, except for some scientific giants in the West, no one can understand the rich content after listening to it once.

Jiang Tian looked around and saw that there were no outsiders, and finally found an opportunity to talk to him alone: "Dexin, who is the son who made you retreat?" ”

Song Yi was still pondering there, so he replied without thinking: "He is Wu Yuanzi, the son of Shunyi Bo, known as the fake prince!" ”