Hogwarts Mental Rehabilitation Center

Parallel space?Traveling around the world?

Dumbledore looked at the three white ribbons in the air and thought for a while, finally remembering what was wrong.

"Since we have traveled to other worlds, what are the observed historical changes in our world? Are the observations wrong? Or are we observing changes in another world?"

Dumbledore's expression was serious.

If there is a problem with observation, then there is also a problem with divination.

If there is a problem with divination, then his previous plan...

"You actually have two questions."

Travis raised his hand and made a V to Dumbledore.

"Do you want me to answer you first about why you have observed changes in the history of this world, or do you want me to answer you about the principles of divination first?"

"Divination."

"Oh, I haven't studied that yet."

Dumbledore:  …

FCUK!

You haven’t done any research and you’re just talking nonsense!

"Then let's talk about why we have observed changes in the history of this world." Dumbledore said after taking a deep breath.

It's a pity that Dumbledore didn't have a quick-acting heart-saving pill, otherwise he might have taken half a bottle in his current state.

"The history of this world has changed, and the reason is actually very simple."

"Generally speaking, parallel space refers to a world that is exactly the same as this world. The people, history, and future are all the same."

"But they're not necessarily at exactly the same point in time."

Travis said as he waved his wand again.

An A1 mark appeared at the end of the A ribbon in the middle of the air, and then another section was added, and an A2 mark appeared at the newly added end.

At the same time, a mark B1 appeared at the end of the B ribbon below the A ribbon, and two more sections were added to the C ribbon above, with the marks at the end of each section being C1, C2, and C4.

"As you can see, ribbon A still represents this world, so what is happening in parallel world B at this moment is what happened in world A in the past, and after a period of time, B will become A at this moment, and it will definitely become . And C is A in the future. A will become C after a certain period of time, and it will definitely become C,” Travis said.

Dumbledore frowned and thought. Suddenly, a bright light flashed in his eyes.

"what do you mean……"

"Yes."

Travis nodded.

"Because everything in the parallel world is exactly the same as this world, including everyone's personality, what they say, what they do, and the choices they make when faced with choices."

"So, before someone at time point A2 in this world went to parallel world B at time point B1 through a space shuttle, there was actually a person from time point C2 in parallel world C who came to world A."

"People from the future parallel world C2 came to the A world A1 and did something. Since all people in the parallel world have the same thinking mode, when the time of the A world passes to A2, the person involved will still make the same choice, using The space shuttle goes to the B1 world."

"When he returns from world B to world A, he will think he is back in A1!"

"What a wonderful misunderstanding~ But it's just a misunderstanding, because he actually went to B1."

"He travels through space, not time. There is an essential difference!"

Travis used his wand as a teaching stick and pointed at the ribbon in the air, spitting and speaking very passionately.

However, Dumbledore seemed like a dull student and didn't seem to listen at all.

"Pause." Dumbledore rubbed his forehead: "You have gone in such a big circle...what's the point? Isn't it easier to explain this phenomenon by traveling through time?"

Bang!

With lightning all over his body, Travis instantly rushed to the principal's desk and slammed the desk.

"Because time is irreversible! No one can go back to the past and change the past!" Travis stared at Dumbledore closely, with lightning in his eyes.

Looking into Travis's eyes, Dumbledore couldn't help but feel an even bigger headache.

"Alright alright."

Dumbledore pressed his hand in vain to signal Travis to calm down.

"What's the reason? I mean the reason, the reason that time is irreversible."

Taking a deep breath, Travis returned to normal.

"The reason is simple. Let us make a hypothesis and you will understand."

Dumbledore: "Say."

"Suppose we can go back in time and change the past, that is, we can go back in time and have a certain influence on the past. Then can I go back in time and push a big stone down on a tall building?"

Dumbledore thought for a moment and nodded.

Seeing Dumbledore nod, Travis nodded too.

"Then I go back in time again to the same tall building, and then wait for a while before pushing the big stone, okay?"

Dumbledore nodded again.

"Suppose that after I pushed down the big rock for the second time, I happened to come out of the building in the past, and then the stone killed him, is that okay?"

Dumbledore was stunned for a moment.

"Look~"

Travis spread his hands.

"If I could go back in time and kill my past self, then my past self would not be able to live to the future using the time turner, and then there would be no future me who would go back in time and kill my past self."

"If you can't kill the past me, then the past me can live into the future and use the time turner to go back in time and kill the past me."

"And if you kill the past me, then the past me can't..."

"stop!!!"

Dumbledore quickly stretched out a hand to stop Travis, who was in the infinite matryoshka. It was too convoluted!

Rubbing his forehead and trying to figure out the logical relationship, Dumbledore came up with a hypothesis after a long time.

"Maybe we can go back to the past, but we can't hurt our past selves?" Dumbledore asked.

"Why not?" Travis asked.

Dumbledore: "Uh..."

"Besides, did I hurt my past self?" Travis continued to ask.

Dumbledore: ? ? ?

You're going to smash your past self to death, so why don't you call it harm?

Looking at Dumbledore with a question mark on his face, Travis couldn't help but sigh, like a teacher facing a student with cerebral palsy.

"Recall the assumption I made before. The place where I pushed the stone twice was exactly the same, and when I pushed it down, I was still alive in the past."

"In other words, when I go back to the past and make changes to the past, what I change is the position of the stone on the tall building. At that moment, I only change the position of the stone and do not impose any influence on myself in the past. any impact.”

"In the past, I was killed by the stone that changed its position after I changed its position, not when I pushed the stone down, and he died at the same time."

"Even if the purpose of changing the position of the stone for the second time was to kill my past self, that was my subjective will, and the objective world does not depend on human subjective will."

"At that point in time, I objectively only did one thing - change the position of a stone."

"In other words, either I can't push down the stone twice, that is, I can't make changes to the past."

“Either I can push the rock down both times, i.e. I can make changes to the past – but that would create the paradox I mentioned earlier.”

Dumbledore sighed and sat down, reaching for the candies on the tray.

Now it's even more complicated, he needs sugar to replenish his brain with energy to keep functioning.