Tuesday night at 10 o'clock.

Harry and Ron touched their heads in the Gryffindor common room at night.

They all looked extremely tired. At noon today, Professor McGonagall drove a flying car into the school and punished the murder of Liu hitting someone.

Ron was punished to Felch and helped him clean all the trophys in the trophy showroom, and was not allowed to use magic.

Harry was punished to go to the castle to clean the public toilets in the corridor. They have been busy since 3 pm until now, and there are no one else in the public lounge. They are the two who will come back at the latest.

Instead of going back to the dormitory first, Harry and Ron lie on the couch near the fireplace in the lounge.

"I feel like my hand is about to break. That old guy Felch must have done it on purpose. He was staring at me all the time, and even gave me one minute to go to the bathroom. Even if I solve it on the spot, it would not be enough." Ron complained to Harry while rubbing his sore and numb arms.

"You're just tired of your arms," ​​Harry said weakly. "I cleaned at least eight public bathrooms today. God knows how many times I vomited? Even now I still feel a smell of smell on my body."

"Ah, then don't get so close to me, the stench will spread to me."

"Anyway, I have to take a shower in a while, and if I touch it, it will be touched."

They made a fuss for a while and soon talked about "serious business".

"Why haven't I seen Hermione these days?"

"Yes, since the last time I was at Quidditch Stadium, she seems to have rarely appeared in the Gryffindor lounge. Even when we saw her, she would say hello to us in a hurry, as if she was busy with something."

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"It's very mysterious."

"She must have something to hide from us."

The two of them looked at each other and saw the same thoughts as themselves in each other's eyes.

"We can investigate her secretly."

"I think so too."

Harry and Ron looked at each other and raised their fists. Just as they were about to meet, the entire castle suddenly vibrated!

"Boom!"

A huge explosion sounded like a thunder before the rainy night began in a quiet summer, awakening countless little wizards who had just fallen asleep!

......

Tuesday at 4 p.m.

In Dumbledore's principal's office, Lynn sat opposite the desk as before, silently watching Old Deng's head take out a golden glowing timer from the drawer.

"This thing is not difficult to apply for, but as long as you apply, you have to sign it with this promise letter."

Dumbledore pushed Lynn with a piece of parchment paper, which asked Lynn to promise not to use the time converter for things that are not related to learning. If there is any violation, he will bear the consequences of the accident.

This letter of commitment is not a contract with magical effects, but a written agreement with legal effect. This form of agreement means that even if the person who signed the letter of commitment violates this commitment, as long as it is not discovered, it will not be considered a breach of contract.

Lynn did not hesitate and signed his name directly on it.

After he finished bookmarking the promise, Dumbledore did not directly give him the time converter, but said in a deep voice.

"You know that using this thing can go back to the past, but why hasn't anyone ever thought about using it to change the past history?"

Lynn scratched his eyebrows and pondered: "I seem to have seen it in a book. The time converter can only be used to understand history, and cannot change the historical trajectory that has already occurred."

"You're only halfway through it, the time converter really can't change the history that has happened, but it can change the history that has not happened yet."

"What's the meaning?"

"The current time converter has basically become a learning tool for Hogwarts. An excellent little wizard who does not have enough time can apply to the professor to obtain it. The professor will consider the qualities of this little wizard. If he is calm, wise and attaches importance to rules, then he will meet the conditions for using the time converter.

The main purpose of the little wizard after getting the time converter is to use it to take the time conflict class. For example, today's two elective courses - Muggle Research Class and the Magical Animal Protection Class - are in conflict. Then the little wizard who gets the time converter can turn the time converter after taking the Muggle Research Class and go back to the beginning of this class to take the Magical Animal Protection Class.

There are two time points in total. The first is at this time after the Muggle Research Class. This little wizard with a time converter took a Muggle Research Class. This has become a history. After he returned to the past with the time converter, he could no longer change this established fact.

The second time point is when the little wizard returned to the past after using the time converter and took the magical animal class to protect the magical beasts. This time is actually quite important to the time he used the converter. However, at this time, he changed a history that had not happened yet, and he took two different classes alone at the same time."

Lynn frowned, he didn't understand what Dumbledore said.

"About the second time point, he took two different courses alone, which had happened after the course began. How could what had happened be called history that had not happened yet?"

Dumbledore shook his head: "It has happened, but when these two classes are in class, does anyone know that there is a person taking two different classes at the same time? The children who were taking Muggle Research class only saw this little wizard coming to Muggle Research class, and the children who were taking the Fantastic Animals class only saw him taking the Fantastic Animals class, and in the memory of all those who saw this little wizard, he only took one class."

Lynn refuted.

"If the little wizard who had taken these two classes met after class and told each other that the little wizard had taken the class they were taking, wouldn't anyone know that he had taken two different classes at the same time?

Dumbledore smiled and looked at Lynn with a meaningful look: "Note the time you said, Lynn."

Lynn was stunned.

The time point he mentioned was already after two classes. At this time, the little wizard had returned to the time when he used the time converter. Even if the two little wizards in the class were vented after the class, they knew that this matter belonged to the future after the time converter was used.

And the future means that it has not happened yet!

"In other words, the history determined by the time converter does not represent objective history, but people's subjective history?" Lin En asked thoughtfully.

“The moment you use the time converter, objective history has been changed.”
Chapter completed!