As Mu Lin finished his self-introduction, Mu Lin returned to his seat. Class 23, Grade 23, will start his daily learning tasks again after welcoming new members.

Most of the morning classes are theoretical knowledge courses. The 33rd class in Grade 33 where Mu Lin is located is a science class. In daily study, he will use mathematics, physics and chemistry as the main learning focus, while the subjects of language and humanities as minors are not deeply studied.

The first class in the morning was physics. Mu Lin opened his own book. Mu Lin had already received a brand new textbook before coming to the classroom. Mu Lin saw the physics class, took out the physics book from the drawer, and then wrote his name on it. Then he did not listen to the teacher's nagging, but started reading it himself.

The technology of Dragon Ball World is indeed ahead of Mu Lin's original world. From the physics textbook alone, Mu Lin can feel the gap between two different worlds. Although Mu Lin's class is only a high school, Mu Lin looked at the discussions on time and space in the book and couldn't help but sigh that in the original world, university might not have learned this knowledge.

Originally, Mu Lin had almost no understanding of this aspect, but after having the God System and after competing with opponents like Hit, Mu Lin felt that he had a deep understanding of time and space. Mu Lin looked at the knowledge in the book at this time and now it seemed so one-sided. As he looked at it, Mu Lin felt a little bored and unconsciously turned his head out the window.

The physics teacher in Class 33 of Grade 3 is an old man, wearing a pair of thick reading glasses and dressing simply, giving people a look of old-fashioned appearance. At this time, the physics teacher was talking about the one-way nature of time and the paradox of time in class. Most of the students after class seemed to be interested in hearing this. However, the physics teacher saw that Mu Lin in the corner turned his head out the window and was not listening to his lecture. So he said to Mu Lin, "That classmate next to the window is the new Mu Ling, right?"

When Mu Lin heard the physics teacher calling him, he turned his head back, then stood up and said, "Yes, teacher. I am Mu Ling, who has just arrived in Class 33, Grade 33."

"I think you seemed to be not very satisfied with my lecture as soon as you arrived. You kept looking out the window and didn't seem to be listening to my lecture." The physics teacher said slowly.

"Teacher, I have been listening to your lectures. But I think what the teacher said is a bit inconsistent with my understanding, so I looked out the window a few times." Mu Lin said truthfully.

"Oh, then what do you think about the one-way nature of time and the time paradox?" The physics teacher asked Mu Lin. At the same time, the students in the class immediately turned their eyes over. No one expected that Mu Lin was named by the teacher after just one class in this class. At this time, Ma Feng, who was sitting in front of Mu Lin, lowered his voice and said to Mu Lin, "Mu Ling, if you say it a little, then this teacher will not make things difficult for you. Although the physics teacher is old-fashioned, he treats us quite well."

Mu Lin smiled when he heard Ma Feng's words, but still looked at the physics teacher and said, "I think that although time is an axis that is constantly moving forward, there is still a way to go back from the future to the past. Because since time is a one-way axis, as long as there is enough energy to separate itself from this axis, there is a chance to move towards the past. Just like our space is three-dimensional space, and if time is compared to the fourth dimension, it belongs to the four-dimensional space. We cannot find a return to it in the four-dimensional space.

The past method. But once we have an energy that is sufficient to escape from the four-dimensional space and reach the five-dimensional space. In that case, when we enter the five-dimensional space, we look at the present world as if we look at the two-dimensional space now. Going back to the past is just turning one body to us. In that case, time travel will become very simple. So the teacher’s unidirectionality of time is not absolutely correct. As long as we move from the dimension where this world is located, time travel and space travel are possible."

The people in the class and the physics teacher watched Mu Lin talk a lot, saying that the method of time traveling is to go to a higher-dimensional space. The students in the class did not know Mu Lin's words very well, and only felt that Mu Lin seemed to be constantly nonsense. However, the physics teacher was shocked. The physics teacher knew that when several of the most famous institutions in the world imagined the method of time traveling through time, they all came to a high-dimensional journey. The reason why the physics teacher did not say this point was because the practice of this idea might be almost impossible. However, Mu Lin was able to put forward this view in the high school classroom, which made the physics teacher take a deep look at Mu Lin.

"How can you determine whether the five-dimensional space really exists? Or is it a place where humans can reach?" The physics teacher calmed down slightly and asked Mu Lin.

At this time, the people in the class also realized that the physics teacher asked Mu Lin's tone was no longer asking questions, but rather like a tone of asking questions. This made everyone in the class start to think about what Mu Lin just said.

"Just just as the two-dimensional space that exists in a plane can never detect three-dimensional space, the space we are in cannot observe colors and five-dimensional space. Because the five-dimensional space has exceeded the range that humans can understand. However, since it is impossible to understand and cannot appear five-dimensional space, we can completely try to create a new dimension as we think. This may be the real function of the so-called time machine." Mu Lin said.

When the physics teacher heard Mu Lin's words, he instantly realized the possibility of returning to the past from the future. "Mu Ling, sit down first. Let's talk about the paradox of time next." The physics teacher looked at Mu Ling deeply, wanting to know how many unexpected things exist in this student's mind.

"Mu Ling's answer is very exciting. In the future, all students should also enrich themselves well after class like Mu Ling. Next, the teacher will think about the paradox of time travel. The paradox of time is also called the grandmother paradox..."
Chapter completed!