Naturally, Ju Ruobai didn't know, because of her appearance, Zhun Yunming started housework for the first time in the world, and at this moment she had just finished washing and was facing the mirror to fix her hair.

It's been a long time since I've seen the children, and it's exciting to be back in class.

As usual, after breakfast, I walked into the classroom. The first lesson she took today was physics, and in her absence, this class was taught by the Qishi generation.

The children were very happy to see Ms. Tsuru return and greeted her politely. She smiled and responded to the children's thoughts, and immediately resumed class.

"I'm sorry students, where did Mr. Qi talk about before? Can you tell the teacher? When I opened the textbook, I remembered that I had been away for three days, and the children must have learned the next lessons in these three days, and they could not teach at their own pace.

"Teacher, yes...... Over here! ”

The child sitting in the front row flipped to a certain page of the textbook and showed it to him. When I looked at it, the guy actually skipped the middle chapter without authorization and talked directly about the penultimate chapter.

As we all know, the order of chapters in physics textbooks is often the higher the chapter, the more important it is, and the later chapters are some popular science or extended knowledge.

And it's still a bit esoteric, space-time theory.

"Teacher Qi, you're really a maverick......"

There is no way, this lesson will find a way to finish this chapter quickly, and the next lesson must be back on track.

"Teacher, teacher, Teacher Qi said that time and space is a very interesting thing that can produce a lot of ...... Eh, what is that word......" (child)

"Well, what is it?" (White)

"That is, the explanation is not clear, contradictory?" (Child)

"Oh~ you mean to say, paradox?" (White)

"Yes, yes, that's what Teacher Qi said, prepare for the discussion! Teacher Qi said that the preparation of time and space is interesting! We can't even think of it! (Child)

Seeing the children so enthusiastic, Ju Ruobai was a little surprised - these little guys are listless when they usually take physics classes, why are they suddenly so energetic now, maybe Qi Shiyi will teach these first, it's not unreasonable, after all, interest is the best teacher, if you want children to learn better, the first thing to do should be to cultivate children's interest.

"Okay, what paradox did Mr. Qi tell you?"

"Yes...... Grandpa Paradox! ”

"Ahaha, it's the grandfather paradox, right?"

"Grandfather and grandfather are obviously the same, they are the same thing!"

"Okay, that's Grandpa's paradox, this paradox should be the most famous of all space-time paradoxes, right? Roughly speaking, if a man could go back in time and put his grandfather ...... before his father was born"

Originally, I wanted to say that I would kill my grandfather, but it was a little inappropriate to say this in front of the children.

"Before the father is born, um, prevent the grandfather and grandma from meeting each other, so that the grandfather and grandma can't be together, they can't give birth to a father, and without a father, then this person can't be born, since this person can't be born, then this person doesn't exist, if this person doesn't exist, then he can't go back in time to stop grandpa and grandma from being together, so grandpa and grandma can still be together, his father can still be born, then he can also be born, but in this way, he can go back in time, Trying to stop Grandpa and Grandma from meeting. This process seems to be incomprehensible, so it is called a paradox, but in fact, many people have explained it, for example, time is not an objective existence, but a subjective feeling. For example, if you want to go back in time, you have to use a time machine, but many thought experiments can prove that a time machine cannot be made. ”

"Teacher, why can't you make a time machine?"

"Because 'they're going to' stop it, of course."

After blurting out this sentence, it was naturally exchanged for the puzzled eyes of the students.

"Teacher, who are they?"

"Ah...... No, no, the teacher didn't know why, and suddenly, his mouth was scooped. A very important reason why time machines cannot be built is because human beings do not have an exact and absolute understanding of what time and space are. And students, if you can't build a time machine now because you don't have enough technology, then why in the future where there is already technology, no one will take a time machine back here to teach us how to make a time machine? This is very intriguing. ”

"I know, because people who travel back from the future don't remember the future!"

"Why did Xiaolan say that?"

"Because that's what people on TV do! And the time machines on TV look very big, and people can sit in them and go back to the past with a bang. ”

"Hahaha, Xiaolan, those are all fantasies of modern people, and the real time machine is not that big."

"Wow! Teacher, you said a real time machine, have you ever seen it? ”

"How could I have seen, I ......"

I thought this question would be easy to answer, but suddenly, many strange shapes appeared in his mind, with lines, circles, and distorted handwriting. She closed her eyes, struggling in the chaotic storm of information, and quickly grabbed the chalk with her hand and scribbled on the blackboard.

Following the various shapes that appeared in her mind, she kept the patterns in her mind as much as possible on the blackboard in the state of confusion, but when it was all over and she opened her eyes, she found that because she had not changed places, she had drawn all the patterns in the same area, and they overlapped each other, and she could no longer see their original shapes.

For some reason, she was a little disappointed.

"Teacher, are you alright?"

"Ah, the teacher is fine, but it suddenly remembered that there was still something unfinished, so ...... Alas, then again, Xiaolan-san, do you really want a time machine to exist? ”

"Uh-huh! If there is a time machine......"

"If there is a time machine, what does Xiaolan want to do?"

"I want to go back in time and see my dad and mom...... Why don't you want me......"

“……”

As soon as this sentence came out, everyone in the class was silent, this is a welfare home, every child is completely cut off from their parents, even their teacher is very white, and the whole classroom is an orphan, so the whole classroom is filled with a depressed mood at this moment.

At this moment, Chu Fangxing's voice came from the door, and the dead silence was finally broken:

"No parent can bear to abandon their children, Xiaolan, your parents must have had a last resort, or suffered an unbearable change, so they have to let you be free. But children, you always remember that you are not alone, everyone here is your family, you are brothers and sisters to each other, and you can help each other to shine again in the future. ”

"Dean!?"

Ju Ruobai was startled by the sound coming from the back door, Chu Fangxing walked into the classroom with a smile, and the children all shouted, "Hello Aunt Chu." ”

As soon as she walked in, she saw the pile of patterns painted on the blackboard.

"What's the matter, Ruobai, what happened just now, how did the atmosphere become like that."

"Ah, well, we just talked about time and space, so we connected to the time machine. I saw that Xiaolan was very enthusiastic in asking questions, and I wanted to know why she wanted to know about the time machine so much, and then, she said......"

"Oh, that's right. Honestly, I also want a time machine, so that many past mistakes can be corrected, and many unfinished regrets can be remedied. ”

“…… But at the end of the day, we can't build a time machine at the moment. ”

"It's a shame to be so. But it doesn't matter, the past cannot be changed, the future cannot be predicted, it is normal, only the present is something we can grasp. As long as you follow your heart in every moment of the moment, then no matter what kind of end it will come to, there is no need to regret it. ”

Chu Fangxing adjusted the atmosphere back to normal, and then left. He reopened the conversation and ended the lesson in another way.

After class, she wanted to wipe the blackboard clean so that it would be easier for the next teacher, but when she saw the bunch of graphics she had drawn before, for some reason, she couldn't get her hands on it.

It is said that it is graphic, but in fact it is layered, and there is basically no useful information to be seen.

And after leaving the classroom, she went directly towards a goal, that is, Qi Shiyi.

All kinds of circumstances have made her have to suspect that Qi Shiyi has something to do with this strange phenomenon.

"Tsk......"

But by coincidence, she was walking on the road in a hurry, and suddenly wanted to go to the toilet, so she had to take a detour to the toilet first.

But as soon as she came out, she froze in place - it was clear that she had only been there for a few minutes, why was it already dark?

She looked at the dark sky outside, and there was a dead silence around her, and the children who were still playing in the corridor before were gone, and it seemed as if she was the only one left here.

"This ...... Am I hallucinating? ”

Juruobai wiped his eyes, but when he opened his eyes, it was still the same scene.

With nothing to do, she had no choice but to go downstairs to look for more clues, but the clues were not found, and a pair of hands suddenly fell on her shoulders from behind, which shocked her.

"Yikes!"

"Teacher Hu, it's me, Qi Shiyi."

"Teacher Qi?"

"Well, you're looking for me, aren't you? Let's go back first, don't stay here. ”

"Hmm."

With this response, countless rays of light suddenly appeared in the dim environment around her, and in an instant, she returned to the world full of light, and the children were also here, and she even found that she was still standing in front of the toilet.

"Teacher Hu, standing here all the time will get in the way."

"Teacher Qi, I'...... You ......"

"Let's talk from a different place."

Qi Shi turned around and walked downstairs, and Ju Ruobai followed behind him, she was full of suspicion and curiosity about this man at this time, and the two feelings were half each.

"Teacher Hu, is there anything you want to ask me?" They walked to a quiet place, and Qi Shiyi was the first to ask her questions.

"Was that one my hallucination?" The first thing he asked was whether the black sky just now was an illusion or ......

"No, that's a little trick it used to try to get rid of you, but luckily I have the ability to dismantle."

"What is it?"

"It's the manager of the world."

Juruobai struggled to control his expression, so that the suspicion in his heart would not be too obvious.

"So, why did it eliminate me?"

"Because you don't belong here, not to eliminate you, to be precise, it's to kick you out of here, and by the way, to send you back to where you should be."

"Oh......"

Ju Ruobai pondered for a moment, then raised his right hand and looked at it carefully. No matter which finger can be driven flexibly, does that mean that she is not dreaming now?

But in reality, can anyone really say these things to others seriously, and expect obedient people to really believe it?

But if you think about it, what you have experienced for so long does seem to be a little unreasonable, so let's just believe him.

"Thank you, Teacher Qi, thank you so much just now, otherwise...... Otherwise, I don't know what will happen. ”

"It's okay, this is what I should ...... Well, it's my own decision, so I need to be responsible. ”

"Teacher Qi, can you tell me more? Do you know who I am? ”

After maintaining his normal expression for a few seconds, Qi Shiyi suddenly smiled:

"I won't tell you."

"Why!"

"I do know, but I can't tell you directly, for some reason."

"To force suspense into the story?"

"Eh, hey~ How could it be this reason, even if it really is, I can't tell you directly. Don't worry, I'll find a way to guide you to remember, and if you don't remember it yourself, then it's useless to just let others tell you. Like, even if you tell an amnesiac child that the man in front of him is his father, he won't really have feelings for his father for the strange man in front of him. ”

Facing Qi Shiyi's slightly mischievous smiling face, Ju Ruobai also knew that he shouldn't expect to ask for more things from him.

"Speaking of which, Mr. Qi, when I was in class just now, I suddenly remembered something, which seemed to be related to the time machine."

"Time machine? What do you remember? ”

"It's a bunch of patterns, it's messy, I can't see any patterns."

Ju Ruobai took out his mobile phone and showed the stacked patterns on the blackboard to Qi Shi, who nodded.

"It's okay, Mr. Tsuru, I'm sure you'll be able to remember it. But before I do that, I want to apologize to you for my self-inflicted actions, which led to what is happening now. ”

"Huh? You don't have to apologize, Mr. Qi, to be honest, I don't understand a little, why do you apologize...... Is it to disrupt the course schedule? In fact, I suddenly found that occasionally teaching some knowledge that is not so important in textbooks seems to arouse children's interest, which I never thought of before. ”

"Ah, that's true, I don't like the arrangement of chapters in physics textbooks, in my opinion, it's just to force children to study in order to cope with exams, and I don't care at all what children think about the subject of physics and how much they love it."

The topic gradually returned to normal, and Ju Ruobai and Qi Shiyi once again communicated with each other as teachers, this time discussing more about the curriculum and the students.

Xiaolan said that if there was a time machine, she would like to go back to her parents. Mr. Qi, what do you think, what do you think, I suddenly want a time machine for some reason, so that I can go back in time and see what happened. ”

"I can only make some meaningless comments on this subject. First of all, the matter of traveling through time, its water is very deep, and not all beings can grasp it. And even if you go back to the past, what can you do, change history, but if history can be easily changed, then it is not called history, or the reason why people will miss the past and remember the old things that have happened in the past in the name of history is nothing more than to use it as a reference to peek into the present and predict the future. The past itself is meaningless, like ......"

"Like?"

"It's like a game of beating, the victory after failure, the repetition and the effort are definitely more evocative than the victory that is won directly by cheating. If people are trying to change the past to get a better present and future, then it will inevitably be a bit of a heresy. Maybe every time you make a decision in the future, you won't be so thoughtful, because even if you choose the wrong one, you can go back and change it. ”

"Makes sense. Let the past pass, even if we lose our parents, the road to the future is still under our feet, isn't it? ”

The class bell rings at this time, and the recess time is over. Qi Shi happened to have a class at the next time, so he hurriedly said goodbye, and Ju Ruobai went back to the office alone.

Sitting in the office, she was not idle, but trying to recall, starting from the strange patterns that she remembered before, and she felt that those must not be meaningless patterns. Qi Shiyi must know, but Qi Shiyi is reluctant to say.

"Ding Dong!"

As soon as the prompt tone of the mobile phone rang, Ju Ruobai picked up the mobile phone, and it turned out to be a message from Jiang Li. A long paragraph, if it is really the style of an elderly person, she told Ju Ruobai that Zhun Junne has received her prompt, and will help her continue to investigate when she goes to work today, in addition, thanks to her blessing, last night, the young master who was pampered since childhood, did housework for the first time, which is really rare.

Although Aunt Jiang was not in front of her, she could imagine how soft the expression on Jiang Li's face would be if she could say this to her face to face.

Perhaps, the two of them can laugh together.

"Aunt Jiang is really charming, to be honest, I hope she's my mother...... But in this case, Yun Ming may be unhappy. ”