In his own room and in his own bed, he sleeps another self, and as a conscious body. But he stood at the door blankly!

This absurdity is almost only possible in the most nonsensical dreams. The old cow stood in front of his bed in a daze, like looking at himself who was sleeping soundly in bed like in a mirror.

I must be dreaming,

Just as the old cow was thinking like this, as if to answer his question, the old cow who was sleeping soundly on the bed suddenly turned over and opened his eyes sleepily.

The two old cows looked at each other like this.

Then the two old cows burst out two earth-shattering screams at the same time.

"Ahhh

The one in pajamas, the old cow bounced off the bed in horror, picked up the bedside lamp on the bedside table, and protected his head and face.

The old cow who came in earlier quickly grabbed the badminton racket behind the door and waved it to prevent the opponent from getting close to him.

It's not a dream!

The two old cows stared at each other in horror, the same faces, the same horror.

The room was silent, except for two identical faces staring at each other in horror and breathing heavily.

Lao Niu wanted to say something, but he didn't know what to say, so he could only look at the other party like this, and he didn't know what he should do next.

It seemed that the other party also had the same idea as him, and the old cow standing on the bed was also leaning against the wall in fear. Stared at him warily.

Stalemate.

If it weren't for the sudden changes that happened next, it is estimated that they would have been facing each other like this.

Just when the two old cows in the bedroom were confronting each other tensely like pouring out of a mold, they heard the sound of metal rubbing in the hole of the key inserted in the iron door outside.

Lao Niu's parents who went to buy vegetables are back.

The old cow who had slept in the house before was overjoyed, and opened his mouth to call. And the old cow who came in the net was suddenly in a hurry, if the other party shouted, and the parents followed the sound to come in and take a look, this chaotic situation was only afraid that Lihai would cause an uproar.

At that moment, the old cow didn't dare to delay any longer, and suddenly threw the badminton racket in his hand to the old cow who was standing on the bed holding the bedside lamp.

The old cow was caught off guard and was smashed by a badminton racket, hitting him in the face.

"Ahh The old cow screamed miserably, the bedside lamp in his hand fell, and his hands subconsciously covered the sore spots on his face, and the cry that had reached his mouth was also smashed back.

The old cow standing by the door did not dare to hesitate at all. A lunge rushed forward, and at any rate, covered the guy's mouth first. Thousands of things are said, but I can't let my parents see this weird scene now.

When the old cow net pounced on the other party, the anxious voice of the old mother came from the door: "Huh?!" What's wrong? Son, what are you doing? ”。

The old cow secretly complained bitterly, but his hands and feet did not dare to stop at all, and he still pounced on the old cow who was covering his head and rubbing his face.

There was a loud "bang".

The old cow's single bed has been around for ten years, and it has reached the critical point of retirement, and now it is pressed up by the weight of the two old cows, the weight of three hundred catties, and the acceleration force that is pressed down by a swoop, the poor wooden bed immediately groaned, and even the bed board and bed frame were all broken.

The two old cows also rolled together and fell the floor.

Lao Niu's parents had already opened the door, rushed over quickly, and twisted open the door of Lao Niu's bedroom.

"Son, what are you doing!" The old cow mother roared angrily.

And the old cow rolling on the ground also looked up at his mother sluggishly.

Scattered bedding sheets, and broken pieces of slabs of sawdust, the old cow sat in a daze among the messy mess.

Just when the two old cows collided together and broke the bed and fell to the floor, the old cow who was sleeping on the bed and was smashed on the face by a badminton racket and was covering his head disappeared without a trace at the moment when the two old cows touched.

When Lao Niu's mother saw such a mess in the house, she was immediately angry and scolded Lao Niu.

But the old cow looked at the angry mother with blank eyes, and let the mother count him down endlessly, but turned a deaf ear.

"Who the hell is the person sleeping in the bed?"

And "who am I now?!"

Speaking of this, the old cow raised his eyes and looked at me. There was also a confused expression on his face, and he said to me with a wry smile: "I, is the description very confusing? ”

It's more than chaos! Jane County is the most chaotic!!

I looked at the old cow a little bewildered. It stands to reason that this inexplicable phenomenon, inferred from normal logic, is simply incredible. However, it is impossible for the old cow to eat too much, and the third watch in the middle of the night came over to play with me to make up stories, not to mention,

What's more, he already knew about the house. How can this be explained?

I pondered for a long time, and said slowly: "You mean, you

Lao Niu nodded and said very seriously: "That's right! I, crossed. ”

"But it's not right," I frowned, "if you crossed over, then why did you go back to your home." Do you see another self that is exactly like yourself? After the crossing, shouldn't you return to your body and live again, just like the rebirth crossing? ”

The old cow didn't seem to know how to answer, and Leng was speechless there.

"I think I can roughly understand this" Nian Cangsheng, who had been listening to the plate, suddenly interjected: "Have you ever heard a story about time travel? ”

"What's the story?" I glanced at the plug-in man.

"The story goes like this" If the possibility of time travel is assumed to be realized in the future, then a scientist who has mastered the technology of time travel will use a machine to teleport himself ten minutes ago, and then use himself ten minutes ago to die. So what happens? Nian Cangsheng looked at us quietly.

What a weird mess this is!

Lao Niu seemed to have an understanding, and thought for a while: "He killed himself ten minutes ago?" ”

"Yes."

"But," the old cow said in confusion, "if he was killed by himself ten minutes ago, then since this person was already dead ten minutes ago, how could he be ten minutes later?" ”

Nian Cangsheng's eyes lit up a little, but he didn't speak.

"And," the old cow's brows furrowed like a knot, "since he no longer exists in ten minutes." Then how could he come ten minutes later to travel through time and space to kill him ten minutes ago?"

Me: "

I'm completely in a mushy state. This strange story of time travel sounds theoretically feasible, but the logical relationships are chaotic and tangled, and the more you think about it, the more confusing it becomes!

"That's right! As you said, this is a famous space-time paradox! Nian Cangsheng said with a radiant face: "The same example, there is also the famous Schröding's stunned cat, the cat that was locked in a box and died and lived, which directly subverted Newton's classical physics and extended quantum mechanics

Me and Lao Niu:"

Seeing that the two of us had gradually evolved into an idiot state, Nian Cangsheng had to stop talking about various terms and nouns that were constantly drinking, and instead used simple and clear words to narrate.

In other words. Let's talk about it this way. If the theory of Einstein's theory of relativity is true, the future of time travel can really be realized, then why can't we meet time travelers from the future today? And even if the method of time travel in the future is found and realized, then the future time traveler travels through time to the past and teaches the ancient people the method of traveling through time, so is the future time travel method invented by the future people, or is it handed down after they tell the ancient people of the past?

This is the paradox of time travel that has always plagued people. According to this paradox, as long as the possibility of time travel exists, this paradox will inevitably exist, and even cause a series of subversions and collapses.

Therefore, according to this paradox, many physicists have tried to explain it, including Stephen Hawking, the author of a brief history of time, who believes that this space-time paradox cannot interfere with the laws of physics, that is, it cannot affect the historical level. However, if time travel exists, the act of returning to the past will inevitably have a shadow on history...

The only possible outcome, then, is that when people go back in time, unless they do not engage in any actions that affect the course of history, if they intervene, then the world will split into two parallel worlds with different directions! ”

"You mean" The old cow that Lao Niu met was actually his own two days ago? "I have chills in my back." That's right. Nian Cangsheng nodded.

"But why did that old cow disappear?"

"I don't know." Nian Cangsheng replied honestly: "After all, the so-called space-time paradox and parallel space are just staying on the theoretical basis, and no one knows what the situation is. Maybe the theories put forward by these physicists are all wrong, just like hundreds of years ago, all scientists believed that the earth was the center of the universe, a place with a round sky."

Lao Niu suddenly looked up at Nian Cangsheng, and said suspiciously: "I, as if I have seen you"

"Huh?" Nian Cangsheng looked at Lao Niu a little strangely, "When?" ”

"It doesn't seem to be like it" without glasses," Lao Niu looked at Nian Cangsheng carefully, and shook his head again, "Probably I read it wrong, do you have a younger brother and sister?" ”

"Nope..."

"Hey! Don't talk about what you have and don't have. Old cow. What happened? Seeing these two, the guy seemed to be getting farther and farther away, and I hurriedly pulled the topic back.

Lao Niu also realized that now is not the time to gossip, looked at Nian Cangsheng, and continued to talk. D