At 6 p.m., 200 meters below the surface of Section 24 (non-low altitude). In the small cafeteria, the lonely Yu Linhan was carrying a plate of nutritious meals to the familiar seat. According to his previous observations, when he sat down, the rest of the staff would come over in twos and threes, and then someone would tease him. This is the theorem he came up with, as for why he was always the first? That's the problem.

Not long after he sat down, what happened next was like his theorem, one after another. So people are accustomed to it, and those who can enter this place will have some quirks to some extent.

He was eating without raising his head, and the person who came to tease him had already come with dinner. The man was wearing a loose and breathable white overalls similar to him, and as soon as the man sat down, he asked him, "Hao Linhan, are you the first in the afternoon?" How did you get the timing so good? ”

"Mo Zixin, I said you can't ask anything else? Didn't I tell you this question - time is life! He stopped his chopsticks and replied seriously.

Mo Zixin, a Ph.D. in biological neuroscience graduate of Qingbei University, entered District 24 a year ago, and Linhan is her colleague and scientific advisor.

"Yes, yes, yes." Mo Zixin nodded, slowly stretched her head close to him, and asked in a low voice, "Eh, I heard that there are important experiments going on in a few days after the mission you presided, can you tell me about it?" ”

"No, this is a state secret, how can I show it to you?" Yu Linhan looked at her with a smile, feeling that it was very interesting.

Mo Zixin was speechless, put her hands on the dining table, stretched out her right index finger, and picked up a chopstick with her left hand and gently placed it on the end of her index finger. Yu Linhan smiled slightly, and asked with interest, "Are you going to perform magic tricks?" ”

"No, you look closely." While controlling the chopsticks and index finger to reach balance, Mo Zixin confidently told Yu Linhan: "The particle of the chopsticks is easy to find, and in order for it to be balanced, my fingers need to bear the full weight of it, and it must be near the mass point. So what can you relate to? ”

"Hahaha, I can only think of it as something for eating." Yu Linhan grinned, looking unconcerned.

Mo Zixin rolled her eyes and gritted her teeth, scolding: "Stupid! Don't always think about eating, keep listening to me. ”

She put her chopsticks aside, leaned her face closer to him, and looked directly at him: "If there is a particle that has no inertia and does not experience any interaction, where do you guess it is?" ”

"It's kind of interesting." He was very interested in these words, and began to analyze: "Let's start with inertia, which is actually a substance in order to achieve a relatively static state with another substance, in short, to achieve equilibrium. If the particle you hypothesize really exists, then it will only stay somewhere and will never be discovered by humans. That's when I can tell that it can't exist. ”

"Why? Please explain. Mo Zixin then asked.

"Do you think that there is a single absolutely stationary substance in the universe? Matter has no meaning without a reference. Suppose an object is moving at close to the speed of light in empty space, then for itself, speed no longer exists, space does not exist, and dimensions are even more meaningless. It is because of the innumerable amount of matter in this universe that other fundamental theories can be produced......"

Mo Zixin suddenly interrupted him: "No, there is something wrong with what you said!" Any matter is the sum of elementary particles, so there are references in the microscopic realm. ”

Yu Linhan shook his head helplessly, squinted his eyes and asked her, "You are a doctor of biological neuroscience, why are you suddenly interested in these?" ”

"Hmm...... I went to your room the other day and picked up a book called 'Elementary Particles.' ”

"Oh, I knew it was you......" Xu Linhan suddenly stopped talking, and ate without saying a word, as if thinking of something. His expression gradually froze, allowing Mo Zixin to ask questions in front of him.

Ten minutes later, Yu Linhan put down his chopsticks, burped, and said to Mo Zixin: "In fact, the theories are all put forward by people, and they can only be practical in the solar system at present, and they are based on matter. However, there is also one dimension-based, but all scientists did not believe it on the day of its birth, and it was slowly forgotten. ”

Mo Zixin took a bite of rice and asked vaguely, "What theory?" Let's hear about it. ”

"Space zero-on-theory, which explains the relationship between dimensions and fundamental interactions, as well as time. As we all know, zero-dimensionality is a point and nothing. One dimension is a line, only length. Two-dimensional in is a piece of paper that has a length and width. Three-dimensional is the space in which human beings live, with length, width and height. What about the four dimensions?

What if four-dimensional beings looked at our world? It's easy to understand that if you have a novel in three dimensions, you won't know the content if you don't look at it, while in the fourth dimension, you can see all of its content without looking at it. ”

"Uh...... What does this have to do with the theory you're going to talk about? Mo Zixin was puzzled. She felt that she had eaten for so many years in vain, perhaps because physics was really difficult to understand.

He paused and continued, "It's matter-based. And looking at the dimension, this is completely different. In the spatial zero-on theory, any dimension is superimposed by units, and zeros are units. There are no zeros in the zero dimension, there is only one zero in the first dimension, four zeros in the second dimension, and eight zeros in the third dimension. The question is, what is zero? It's not material, it's nothing, you can think of him as a hundred dollar bill. We can see how many bills there are in one, two, and three dimensions, but not in four dimensions, because our eyes can only observe eight banknotes, just like a person can only wear two shoes. Creatures in higher dimensions can observe lower dimensions, but cannot observe higher dimensions.

Let's talk about the relationship between zeros and basic interactions. Because the basic interactions are related to matter, matter affects zeros, resulting in uneven distribution of zeros and distortion of space. So the zeros have a relationship between indirect and fundamental interactions. ”

Mo Zixin listened so much, but he still didn't understand the so-called spatial zero theory, after all, a person who has never been involved in advanced physics can listen to it. She had to pretend to be happy and nodded, lowered her head and continued to eat, and the Xu Linhan in front of her did not speak again. As for the relationship between zero and time, this may end here.

Century, half past ten in the evening. Before the curfew at ten o'clock, Fang Chenxi returned to the dormitory. At nine o'clock, she collected Bai Fengyi's basic information and told him something. Because Bai Fengyi's health is fine, he can leave the Century, but he doesn't have an ID card. This question gave Fang Chenxi a headache, and there was really nothing he could do except find Eric.

Fang Chenxi sat in front of ITSC (all-in-one touchscreen cloud computer), checking Bai Fengyi's file. She had already decided to take him back to Earth in two days and meet with Rhodes. But before that, she had to get Eric out of the way, and it would be easiest for him to arrange the spaceship and ID card.