By the time Yu Shan got home, it was already past seven o'clock in the evening. Zhao Xiaomeng knew that Lao Qiao's matter made Yu Shan feel very bad, so she didn't say anything, just asked a few mouths, and then returned to the furnace with two plates of completely cold works.

Yu Shan didn't eat much during this meal, and Zhao Xiaomeng didn't eat much. Yu Shan is because he has a lot of thoughts, and Zhao Xiaomeng is because the dishes are not right. She sadly found that because he had not cooked for a long time, his skills were far worse than that of her husband Yu Shan.

This night, Yu Shan tossed and turned, and even his wife Zhao Xiaomeng didn't sleep well. Early the next morning, Zhao Xiaomeng drove away 308, ten minutes late, and Yu Shan drove the M4 to work.

Along the way, his right eyelid kept beating, and although he knew that it was just a nervous reaction caused by poor sleep, it still made him even more relieved of Josie. As soon as he arrived at the unit, the first thing Yu Shan did was to call Qiao Si. As a result, Joss's cell phone went unanswered, which made him even more uneasy. I had the heart to immediately drive to Lao Qiao's video store to take a look, and it happened that the boss's car happened to drive into the parking lot.

Yu Shan pondered that it would only be four hours before the lunch break, so he put this matter aside for the time being. I locked the car and didn't go far towards the sports team's office when I heard someone greet me from behind.

When I looked back, I saw that Xiao Zhang, who taught science, chased after him with a sad face.

"What's wrong?"

"Don't mention it, it's not for Jia Lili to make trouble!" Xiao Zhang said angrily.

Yu Shan asked curiously, "Why are you messing with Teacher Jia again?" ”

"Where do I dare to provoke her, it's too late to hide!" Xiao Zhang said bitterly: "I went out to eat yesterday and forgot my mobile phone on the desk, Jia Lili ordered takeout, and when I was full, I took a nap in the office." Coincidentally, my girlfriend called me at this time...... You know what my girlfriend looks like, it's a tendon. The more you don't answer the phone, the harder she hits. As a result, the ancestor was argued! Eh, if you change Mr. Yu, will you at most mute or turn off your phone? ”

"That's right."

"Guess what that little ancestor did? They answered the phone directly and shouted at my girlfriend: 'It's endless, and I won't let people sleep!' 'Eh, my girlfriend was already suspicious, but it's good, I can't wash it even if I jump into the Yellow River. ”

"Tragedy." Yu Shan patted Xiao Zhang's shoulder sympathetically, pondered for a moment, and said, "But your girlfriend is too clingy, anyway, she has just come into contact with her, and if she is yellow, she will be yellow." I think you're a good match for Teacher Jia. ”

Teacher Xiao Zhang looked at Yu Shan in horror: "Teacher Yu, which eye can you see that I am as compatible as the Demon King of the Mixed World?" ”

"Obviously, let it go, it's called rejoicing enemies; Now it's changed, and the fashionable saying is to love and kill each other. ”

Teacher Xiao Zhang immediately shouted, "Huh! Teacher Yu, you can just kill me now. ”

After the joke, Yu Shan suddenly remembered that Mr. Xiao Zhang in front of him seemed to be studying physics-related majors in college, so he asked tentatively: "Mr. Xiao Zhang, what major did you study in college?" ”

"Yes, physics in the undergraduate sciences, macrophysics in the master's degree." As soon as he said this, Xiao Zhang was proud, in Yucai Primary School, he Xiao Zhang, who has a serious master's degree, is the only one.

"What do you study in macroscopic physics?" Interlaced like a mountain, Yu Shan really didn't know what the specific research of macroscopic physics was.

"It's mostly astrophysics, plus relativity."

As soon as he heard that there was a theory of relativity, Yu Shan came to the spiritual head. He himself is a science fiction lover at best, and many theories only know what they are, but they don't know why. Many physical theories can only be talked about superficially, and professionals need to be real people. So he excitedly asked, "Can you help me answer the question about time travel?" ”

Xiao Zhang smiled: "Teacher Yu is planning to submit again?" In recent years, Yu Shan has sent a lot of manuscripts to various science fiction publications, and sometimes he can publish them, including two short articles published in Science Fiction World magazine. This matter is not big or small, and I don't know how it was known by Comrade Lao Yu's old friend, Comrade Lao Luo of the Municipal Education Bureau, and Comrade Lao Luo also praised Yu Shan by name at a meeting of the city's education system, and since then Yu Shan's reputation as a science fiction writer has become famous in the education system. Brackets, Yu Shan's current work was arranged by Comrade Lao Luo, and the brackets are complete.

Xiao Zhang was very depressed for a while. Thinking about Yu Shan, a physical education teacher who does his job well, what kind of science fiction essay does he have to write? How does he, a high-achieving student who has graduated from a master's degree in macroscopic physics, deal with himself? For a while, Xiao Zhang held back his strength and made up his mind to write a purer science fiction than Yu Shan. After holding back six words for a week, Teacher Xiao Zhang gave up. From then on, whoever mentions the article written by Yu Shan, Mr. Xiao Zhang will always pretend to be cold and say the last sentence on the side: "It's just soft science fiction." ”

Hearing Xiao Zhang's question, Yu Shan followed the other party's words and said, "Yes, I have some ideas recently." ”

"I'm done writing it back, I must let me see it first."

"Okay, no problem."

Without waiting for Yu Shan to ask anything, Xiao Zhang said: "The time travel you are talking about is first of all a pseudo-science fiction proposition. What is more popular now is parallel time and space. "Xiao Zhang held back his energy to write the article for a week, and he made up a bunch of science fiction works of various types. Later, I found that the text was dry and uninteresting, so I decided to start with the simple and interesting first, and I couldn't extricate myself from immersing myself in online literature......

Listening to Xiao Zhang's more and more outrageous words, Yu Shan hurriedly found an opportunity to get back to the topic: "Teacher Xiao Zhang, what I am thinking about now is the paradox of time. Yu Shan listed several paradoxes, such as the grandmother paradox, the coffee paradox, the prophet paradox, and the fate paradox.

Now Mr. Zhang understood. He wiped the non-existent sweat from his forehead, and pretended to be deep: "I happen to know a little bit about what you said." One result is to fall into an infinite loop, and now I not only stop me from stepping on **** last year, but instead prompt me to step on **** last year, which forms a cycle; In another case, we have to start with parallel time and space. ”

Xiao Zhang squatted down, picked up a stone from the flower bed, and drew a straight line on the cement pavement: "Space is not the only thing, no matter what you do or don't do in this world, it will lead to the division and derivation of the world. Your actions will lead directly to future developments. That is, there are infinite spatial dimensions in the same time dimension. ”

"String theory, 11-dimensional space?" Yu Shan frowned and interjected.

"Yes." Zhang went on to explain: "Anything that happens on a timeline is predestined on that timeline and can never be changed. Any attempt to change this timeline will likely result in a new timeline. He drew another line diagonally in the middle of the straight line: "And the original timeline remains the same and will continue to exist." ”

Xiao Zhang clapped his hands and stood up: "Understood?" ”

Yu Shan shook his head: "I have thought about what you said, but there is a problem. I...... The protagonist who wants to write about it, every time he goes back in time and comes back, he finds that he has changed history, and some memories suddenly increase in his mind that he didn't have before, and he still retains all the memories he once had. ”

Xiao Zhang scratched his head: "Anyway, it's pseudo-sci-fi, you can set the protagonist to jump from one timeline to another." It's logical. ”

Listening to Xiao Zhang's almost childish explanation, Yu Shan said suspiciously: "Is this okay?" ”

"Why not? I don't believe you have a better explanation. ”

What else can Yu Shan say besides thanks? You can't say that this is not a novel at all, but his own personal experience, right?

The morning was hard. There were no teaching tasks in the first and second classes, and after the third and fourth classes, Shanshan was busy, leading the two classes to walk in line for a while, and then did a few small games. As soon as the bell rang for the end of class, Yu Shan couldn't wait to drive to Josie's video store.

The rolling shutter door of the video store was confiscated, and Yu Shan knocked outside for a long time without responding. Yu Shan called Joss again, but the phone was still unanswered, and he vaguely heard the mobile phone ringing in the store.

This frightened Yu Shan, for fear that something would happen to Qiao Si. In a hurry, he suddenly remembered the location of the spare key that Joss had told him, and hurriedly lifted the mat at the door, and sure enough, he found the spare key.

Holding the key to open the roller shutter door, Yu Shan pushed open the door of the store and rushed in. The store was pitch black, and Josie's Huawei phone was quietly placed on the bar, and the screen was suddenly lit up.

Yu Shan turned on the light and found that not only his mobile phone, but also his wallet and keys were on the bar. Yu Shan turned around the entire video store and found no trace of Qiao Si, and also found that the all-in-one machine had been on standby.

Yu Shan was puzzled, it was said that the roller shutter doors were locked, and the spare key had not been moved, so there was no reason why Qiao Si's key was placed on the bar counter, but the person was gone. Even if there is any urgency, no two hundred and five will leave their wallets, mobile phones, and keys behind...... Well, Yu Shan suddenly felt as if he had scolded himself—he had done this last night.

Shaking his head and retracting his thoughts, Yu Shan carefully analyzed. The roller shutter door can only fall and lock from the outside, and the back door of the store can only enter and not exit, and the key is placed at the bar, but the person is gone, so there is only one possibility...... He slowly shifted his gaze to the pitch-black back door.

It must be so! Joss must have gone through this door again!

This bastard! He's so dead!

Yu Shan was furious. God knows when Joss passed, Yu Shan had been in the store for at least five minutes, and if Joss hadn't had an accident, then he should have been back three minutes ago. Unless...... Joss has had an accident!

Thinking of this, Yu Shan couldn't care about anything else, strode towards the gate of yesterday, and when he arrived at the door, the right hand that pushed the door paused in the air, and then pushed it down without hesitation.