Physics Lessons.

Wu Lei sat next to Li Chenguang, playing with the switch, and from time to time stuffed biscuits, potato chips, chocolates, cakes, shaqima, gummies, etc. into his mouth

Li Chenguang sat next to him, lying on the table with his hands folded, looking at the blackboard with a weak look.

Li Kairong, a well-known professor in the Department of Physics, who is close to old age, has white hair and talks eloquently at the podium.

Wu Lei ate for a while, and turned his head to look at Li Chenguang, "Why don't you play games, don't you also have a switch, I still want to connect with you." ”

“…… I forgot to bring it. ”

"Then why don't you play the king?"

"You play, I don't really want to play today."

"What's the matter, people who don't know, still think you're out of love."

Wu Lei said, stopped the fat palm holding the biscuit, and paused, "You won't really fall out of love." ”

"What kind of love is lost, where do I get my love to lose, I am, I am ......"

Li Chenguang didn't know what was going on.

"By the way, don't you like the class flowers of class 6 in high school? What happened? ”

"How's that?"

"How are you two, didn't you do anything?"

"I like her now, what else do you want from me? You don't want me to go up and be humiliated by her. ”

“…… You have a point. ”

Li Chenguang agreed.

Wu Lei said while chewing biscuits, "As long as I don't touch her, I can always like her, I'm going to get in touch, I'm afraid I won't be able to continue to like it, women, it's really troublesome in some aspects." ”

“……”

Sometimes, you don't understand why this person who hasn't spoken a few words to a girl can express such feelings.

Li Kairong said in a slightly old voice on the podium, "Today I will tell you about dimensions, we all know that countless points form a line, that is one dimension, countless lines form a surface, that is two dimensions, and countless faces are composed of three-dimensional space." ”

"Any dimension, for low-dimensional creatures, is a dimensionality reduction blow, for example, an ant living in one dimension, he can only move left and right, two ants meet, it is impossible to get around, because they do not have the concept of up and down, but two-dimensional creatures have up and down, ants can go around from top to bottom."

"And let's say that on a two-dimensional plane, that is, on a target, there is a group of ants, and now there is a marksman."

"The marksman is so good that the bullet hits a flat target, and every two bullet holes are exactly 10 centimeters apart. Scientists living among the ants living on the target will find that there is an "objective law" in the universe, and there will be a "space hole" every 10 centimeters, so they spend a lot of manpower, material and financial resources, based on observation and research, to deduce the perfect theorem and formula to fit this law, and evolve into a discipline, which is our current physics. ”

"Physics is a magical thing, it may be the law of the world, or it may just be based on the improvisation of the marksman, a large number of scientists have been unable to peek into the essential reasons for the formation of 'space loopholes' in their lifetimes, and we can only study based on this."

Then, a classmate asked.

"Teacher, so the physics of our three-dimensional biology is probably driven by an interest in four-dimensional biology? Like the speed of light, like the speed of sound waves, like the gravity of the earth are all fake? ”

Li Kairong nodded, "Even if we think that the sun rises from the east, we take this as the truth through observation, because he rises like this every day, every month, every year, in fact, it may just be the skill of a marksman." ”

Li Chenguang lay on the table and looked at Professor Li Kairong on the podium, "In other words, this professor's lecture is quite vivid." ”

"Of course, I heard that it was a big bull hired by the school, an academician of the Chinese Academy of Sciences."

"Oh amazing, for the first time, I felt the urge to attend a lecture."

"Don't listen, don't come to the king, I'll accompany you."

“……”

Another student asked, "Teacher, do you mean that there are still four-dimensional beings?" ”

"I don't know."

Li Kairong said in his unique elegant voice, "Just like a two-dimensional bullseye creature can't observe a three-dimensional creature, a three-dimensional creature can't see a four-dimensional creature, just like there is a huge amount of dark matter and dark energy in the universe, and our five senses can feel and come into contact with only four percent of the universe's matter." ”

"Even if we are sitting here now, there may be a large amount of dark matter like a meteorite, and the dark energy penetrates our bodies, but we can't feel it."

Then, some classmates sighed.

"Large meteorites."

"Stains."

"It sounds even more exciting when it goes through my body."

"Then when will our human science and technology develop to the cognition of four-dimensional creatures?"

"It's very difficult, and we don't know if there are four-dimensional creatures, and now there is a common saying in the scientific community that if there are four-dimensional creatures, then, whether or not we can recognize four-dimensional creatures does not depend on our technology and progress, but on whether they are willing to let us know."

Li Kairong said, throwing a question to everyone, "As we all know, we have increased the height on the plane compared to two-dimensional creatures, so what is the other name of our three-dimensional creatures?" ”

Then sit in the front row, and Tao Xue, the secretary of the Youth League branch in front of him, raised his hand high.

Li Kairong pointed at her, "This classmate said. ”

Tao Xue stood up happily, "We are space creatures, which refers to the three-dimensional creatures that live in space, and can swim freely in space. ”

"That's right, three-dimensional creatures are also called space creatures."

Li Kairong looked at her with a kind face, "Then the four-dimensional creature adds another dimension to the space, do you know what it is called?" ”

Tao Xue thought for a moment, "...... Add another dimension to space? ”

"What's that?"

She frowned and thought for a moment, then shook her head.

Four-dimensional?

She couldn't think of it.

Li Kairong motioned for her to sit down.

"So did any classmates think of it?"

There were classmates whispering in the audience, but no one got up to answer, if you want to add another dimension to the three-dimension, how should you increase it, isn't this long, wide and high?

Then Li Chenguang raised his hand rarely.

Li Kairong pointed to Li Chenguang, who was sitting in the third to last row in the back row of the second column, "Let's talk about this classmate." ”

Li Chenguang stood up, "Isn't it, increasing the dimension of time?" ”

Li Kairong smiled, "That's right, this classmate is very smart, Einstein once proposed that if the third-dimensional creature is a space creature, the fourth-dimensional creature is a time creature, and then it is unimaginable." ”

Wu Lei looked at Li Chenguang in surprise, "You have a funny brain, and you actually took the initiative to raise your hand to answer questions in class." ”

According to their usual habit, they should bury their heads low like rats in the gutter, for fear of being called.

Li Chenguang replied weakly, "It's boring." ”

"Something is wrong with you."

The students were talking again, "Time creatures? ”

"Time shuttles."

"Can they walk around in time?"

"It's terrible."

"Isn't that time out of order?"

“……”

There was an uproar below.

Some people laughed, "Then how do they spend their time, for example, the world of four-dimensional creatures also sells Mark Six lottery, then they have Mark Six lottery numbers today can't cross over to yesterday to buy today's winning numbers, everyone is a monopoly." ”

There was laughter again.

"Moreover, if time is traversable for them, wouldn't they not die, if I die today, I will wear it until ten years ago."

Li Kairong listened to the enthusiastic discussion of the students below, just smiled, and when everyone finished discussing, the audience was a lot quieter, and then he continued, "Two-dimensional creatures can't see three-dimensional, three-dimensional creatures can't see four-dimensional, everything we do is just based on conjecture." ”

"Think about it, we are space creatures, but can we travel through space infinitely, you can go from home to school, you can take a spaceship from the earth to the moon, but can you sit on Neptune, even if you go to Neptune, can you go out of the solar system, even if you go out of the solar system, can you go out of the Milky Way?"

Then a classmate said, "That's why we can't live that long, if we are given an infinite lifespan." ”

Li Kairong said with a smile, "The farthest star that has been observed so far is 12.8 billion light-years away from us, even if you have an infinite lifespan to catch up, why do you think that the universe will not expand and will not move away from you at a faster speed?" ”

“……”

Now, everyone was silent again.

"We can't do it, even if we are three-dimensional space creatures, we can't travel infinitely in space, we need to consume costs, manpower, material resources, and time, even if science develops again, human life span is extended, and the speed of the aircraft is faster, we can only extend the physical distance that can be shuttled indefinitely, to explore as many percentage points in space as possible, and there is no way to go back and forth."

"In the same way, the current mainstream view is that four-dimensional creatures, that is, four-dimensional time creatures, can act on the coordinate axis of time to travel through time, but they also have to pay a price, and it is not infinite to shuttle, as for what this price is, it is impossible to know at present."

Someone asked, "What is their history, isn't it a mess?" ”

"I can't imagine, guessing that there should be a special force, or a special rule, that will counter and correct this, just like in an ecosystem, if the number of plants, animals and microorganisms is maintained at a certain level and does not change much, this state is called ecological balance, and the ecological balance can be destroyed, like we prey on a large number of eagles, rabbits will reproduce indefinitely, but ecology will not allow an object to be out of balance, he himself will use the power of balance to regulate, such as diseases, plagues, such as new natural enemies, If there is a rule-like force to regulate the dynamic equilibrium, and if there is such a balance in space, then there should also be in time. ”

Someone else asked, "Teacher, if there really is a four-dimensional creature, will he suddenly want to deal with us one day?" ”

"It's like trying to crush a passing ant."

Li Chenguang was listening to the class, and Wu Lei directly stuffed the switch into Li Chenguang's hand.

Excitedly picked up the mobile phone in the drawer, "You play first, there is a girl looking for me to fight the king." ”

Li Chenguang immediately leaned over and said, "Who?" Your new hooked up girl, I don't know, your king level is average, do you want me to take her? ”

"You go aside."

Wu Lei looked disgusted, "There is no ship here that can carry you, the new era, the new era is beckoning to me, lalala~~ I feel that the girls in college are much kinder than in high school, and they won't whip you at every turn." ”

"Is there one? How do I find it harder. ”

Li Chenguang aimed at the name of the remark on the mobile phone chat box, "Su Tingting!" ”

The demon whispered, "Believe me, women are a curse, and the more beautiful a woman is, the more she will hurt you." ”

"So what?"

"Push it to me, I'm not afraid of hurt."

"You get out."

……

……

As soon as Yin Ruosheng got out of class, she just walked out of the door quickly, and she saw Yin Feng on the opposite side, and Yin Feng beckoned to her.

Yin Ruosheng walked up with the textbook in her arms and said with a smile, "What a coincidence." ”

"Unfortunately, I'm waiting for you."

Yin Feng had a light smile on his face, "Just talk about tomorrow's sports meeting." ”

"This ......"

Yin Ruosheng is a small staff member of the secretarial department, and she can't talk about serious things.

I've never seen the big boss talk directly to the little minions, and there is still the secretary and deputy minister between the two.

If there is anything, you should talk to them first, and then they will convey it.

There are some things that everyone knows.

But.

Yin Ruosheng smiled dryly, "Not today, I made an appointment." ”

Yin Feng showed a look of regret, "Is that so, that's really a pity." ”

"Next time."

Yin Ruosheng said with a smile, "Actually, it's just a phone call, you don't have to go out of your way to wait for me." ”

Because she found that the boys and girls passing by around her were all looking at her.

Whispering there.

"That guy is so handsome, my God."

"It's so handsome, it's handsome, it's miserable, who is that."

"Idiot, we student presidents don't know each other, haven't you spoken on stage before?"

"I may be playing with my mobile phone, I deserve to be the most handsome guy in our Jiangnan."

"Look, look, it's our school flower and the student president."

"It's a good match, this pair of cps."

"It's worthy of being our school flower."

“……”

After this crowded class, the two stood next to each other, as if they had become actors in the spotlight, comparing the people around them and becoming the focus of the crowd.

Yin Feng smiled, "Many things have to be said in person to have an effect, otherwise it will be too insincere." ”

Yin Ruosheng smiled dryly, "This kind of thing is not so serious, I'm just worried that you will go in vain." ”

"Then in order not to let me go in vain, let's go for a walk together?"

"Oh."

Yin Ruosheng subconsciously agreed, but immediately remembered that he had other important matters, and hurriedly shook his head and said, "Not today, I'm in a hurry, I'm really sorry, I can't catch up if I'm late, I have to go." ”

"Okay then."

Yin Ruosheng said again, "Bye-bye", and didn't care about saying anything more, so he hurried away, walked away quickly with a pair of long legs, leaving Yin Feng alone, and looked at the slender shadow of Yin Ruosheng leaving in a hurry, a complicated look flashed in his eyes, and then he also left.

As soon as Yin Ruosheng left Jiangnan University, he hurried into the nearby University of Science and Technology.

She came out quite early, she checked on the Internet, and the course was half an hour earlier than his mathematics and computer department, although she was delayed by Yin Feng, she should still be able to catch up......

I know what you're going to say, and soon you'll see it work......

(End of chapter)