Li Yifei doesn't know if Reiki is dark matter, because it is beyond his physical knowledge, but Reiki is definitely a kind of matter, and it should be explained by physical and chemical methods. Then, let it be regarded as dark matter.

As for this world, Li Yifei has thought about where and where it is since he arrived. It is obviously similar to the earth, so where is it? According to his astronomical knowledge, at least in the known astronomical world, within a certain light-year range, no second earth has been found, especially if it is the same in size and atmospheric composition. Where is this planet? Is it in the solar system, or has passed through the gap to an unknown place...

The person in front of him can answer his doubts, so Li Yifei looked at him curiously.

"This is the earth you are talking about!" Chen Tuan said.

"Ah? How is it possible?" Li Yifei was immediately surprised, and even stomped his feet. He couldn't believe it, and immediately asked: "Senior, I don't believe you, but how is this possible? Is it that our time and space are different? At a certain point in time on the earth?"

Li Yifei had had this conjecture a long time ago, but he has already ruled it out, because the geomorphology is different, just those lofty mountains into the clouds are not what the earth can have, but...is it really so?

After Chen Tuan finished speaking, Li Yifei first denied himself, then looked at the other party, waiting for the answer to be revealed. Is this a magic technique? At least the current earth technology cannot achieve time travel. Although scientists have given many hypothetical methods, for example, you can travel through time and space when your own speed reaches a certain level, but at least it must surpass the speed of light.

Li Yifei didn't remember what it felt like in the crack, as if it was just a moment, as if it was an extremely long period of time.

So, what is going on? Li Yifei looked at Chen Tuan, Chen Tuan shook his head slightly, and said, "This is the earth you are talking about. As for the time point you are talking about, it is actually the same. I said that there is yin and yang, it is the truth of the world. Then this is the dark side of the earth, and the world you live in is the sun!"

"I... still don't understand, where is this place? I said earlier that science and technology on the earth are developing rapidly. Not only are there planes in the sky, there are also thousands of aircraft, called satellites, flying hundreds of miles away. They have many functions. Some are used to look into the distance and take a look at other planets, and some are used to detect, survey and map the ground, etc. If there is another earth..." Li Yifei said more and more confused, until the end Confused myself.

"A piece of paper!" Chen Tuan interrupted Li Yifei's words and said, "A piece of paper has a front and a back, and when the palm of your hand stretches out, there are also fronts and backs. Then your earth also has both fronts and backs. Although it is a ball, it also has backs. !"

"The opposite is in the center of the earth? I mean, under our feet?" Li Yifei asked.

"No, a piece of paper can have a negative side. This is positive and this is negative. We understand space as a piece of paper. Then you live here and I live on the other side. This is a simple understanding!"

"That is to say, the earth is a spherical shape, but it can be understood as a thin layer. The surface side is our earth, and the inner side is here?" Li Yifei said and gestured. Chen Tuan on the opposite side listened and meditated. Once, nodded and said: "You can say that, but... it's more complicated than this!"

"Then I understand, there are two sides of yin and yang, or the real world and the dark matter world..."

"After opening the world, there will be two spaces. As I told you, this is the Tao, the Tao of the heaven and the earth, cannot be isolated. As for why, if you understand it, you will become a fairy!"

"Cheng Xian?"

"Yes, Cheng Xian!"

"Is there really a fairy in this world?" Li Yifei asked again.

"Why not?"

"Because I have only heard of it, but never seen it!" Li Yifei said.

Chen Tuan laughed loudly and said, "To ordinary people, you and I are immortals. To you and me, there will naturally be immortals in the world, and even more immortals!"

"Where is the fairy world?" Hearing the last sentence, Li Yifei immediately developed curiosity. What he heard today was enough to shock him. Although Li Yifei knew that there was a fairy world, he wanted to know what it was. What kind of place.

"The fairy world, I don't know! I used to pursue it for hundreds of years, and then after a great battle, I suddenly realized that my life should stop at this time, no need to pursue the fairy world!"

"Is that not a higher level, can you live longer?" Li Yifei asked puzzledly. The two of them had finished drinking, so he took out two more jars, but Chen Tuan waved his hand to indicate that he would not drink it.

Looking at Chen Tuan’s red face, Li Yifei obviously didn’t expect the old man to be too strong to drink. Isn’t it the legend that Chen Tuan is known as the wine fairy? After giving up drinking, Li Yifei did not ask about this matter.

Chen Tuan's body really seemed to have a problem. His reactions became very slow and his breath became insufficient. He was silent for a long time this time, and it was more like thinking. Li Yifei drank wine and waited for the other party's answer.

"What is the meaning of longevity?" Chen Tuan seemed to be asking Li Yifei, but also to himself.

"Longevity is meaningless!" This is the second sentence.

"So it's meaningless to live too long!" This is the third sentence.

You have been alive for hundreds of years. You have been stunned by the wind and the wind. Now it is boring to live, but I can’t. How old I am. Now I say that it’s boring to live, so why not live?

"Senior, there is a fairy world, but only those who have been to the fairy world know what it looks like?"

Chen Tuan smiled and said, "Not bad!"

"Oh." Li Yifei sighed faintly, and said, "Everyone in the world pursues longevity and supreme abilities, but you always don't want to pursue..."

"Don't mention this, it's my business that I don't pursue it. You hope it's your business, and it won't affect each other." Chen Tuan brushed the dust on his leg and glanced at the praying raccoon around him. , Said: "It is thanks to these little guys that I can survive to this day!"

"They have a sense of wisdom?"

"I didn't have it, but after I have cultivated these years, I have gained spiritual wisdom! After I was injured that year, I chose to be confined to it, even frustrated, and I wanted to be self-reliant but vigorous, but it happened to belong to their ancestors In the lair, a few guys thought I was going to starve to death, so they gave me their own food, indicating that I was practical. They were so touched at the time that they taught them simple cultivation techniques, which have been passed down from generation to generation!"