My physics masters couldn't possibly be grand mages.

"To get back to the point," Einstein said seriously, "the special theory of relativity means that the faster the speed, the slower time passes."

He paused, then continued, "Imagine you have a twin brother. You travel to space on a spaceship that travels at near the speed of light, while he stays on Earth."

When you come back, you'll find that you've only aged a few years, but your brother might have aged decades. Time will seem to slow down for you.

"Time is not absolute or independent, but closely related to space and the movement of matter," Einstein said.

"Is that the state of that library?" Xia asked.

Einstein thought for a moment, then shook his head. "The speed of thermal motion of microscopic particles is directly related to temperature. If molecules in the air approached the speed of light, the temperature would reach unimaginable levels, and people and books would instantly vaporize."

He paused, then continued, "General relativity is close; the greater the mass, the slower time passes."

Xia nodded. He had a general understanding of general relativity in the past because he had seen a famous movie called Interstellar. The protagonist spent a few days near a black hole and his daughter was almost dead when he returned.

"But something with a mass large enough to affect time is comparable to a black hole. If it really existed, we would have been sucked in long ago," Einstein said.

"That means it's more likely that the influence came from within the rules," Tesla said, stroking his chin. "The person who created that library must have been quite a figure."

"No matter which one it is, it's beyond our reach right now," Xia said.

"Not necessarily."

Char slowly raised his head to look at Einstein, who was speaking.

"If we could speed up the speed of thinking, the flow of blood, the burning of hemoglobin, and the time required for muscle movement to begin and end."

Einstein looked up. "Is it possible to achieve a certain degree of 'time dilation'?"

"Is it similar to bullet time?" Xia asked.

Einstein and Tesla exchanged a glance, and both could see the doubt in each other's eyes.

"What is that? Does the Tower of Truth already have ready-made magic?"

"No, it's something from a science fiction movie," Xia said, explaining it to them.

Einstein nodded after listening. "That's roughly the idea."

Tesla shook his head. "Even if it could be completed entirely, the amount of data involved is too large, exceeding the scope of the third tier. Moreover, this is an enhancement-type magic, and it doesn't fit the mindset of the previous engineering-based magic."

"What if we simplify it further?" Einstein asked. "For example... just accelerate thinking?"

Xia raised his hand, and he took the laptop out of his storage space and placed it on the table.

"Student A."

He called out to the voice assistant.

"exist."

What factors determine a person's reaction speed?

"From 'seeing an attack' to 'responding,' the human body needs to go through a process of sensory acquisition—neural transmission (from vision to the brain)—brain processing—neural transmission (from the brain to the muscles)—muscle contraction and exertion."

Can faster thinking lead to faster reaction time?

"It's feasible," the AI ​​said. "The brain's processing takes up about 50% of the reaction time, and it's the most influential factor."

Einstein and Tesla exchanged a glance.

They don't actually use AI very often.

As some of the greatest scientists in history, they have their own pride.

Problems that are truly unsolvable are only handed over to computers. For example, Einstein's calculation skills were not particularly good compared to those of top mathematicians, so many computational problems were handled by computers.

Moreover, in terms of creativity, AI is still not as imaginative as real humans. After all, Char's computer is just a very ordinary civilian machine, and it is quite old. It is not a powerful artificial intelligence.

However, this kind of information retrieval is still very useful.

"Do you have any way to speed up thinking?" Tesla asked.

AI reacts very quickly.

"I found a paper on how electrical stimulation of nerves can improve reaction speed, which should be suitable for your needs."

"Let us see it," Einstein pressed.

But the next moment, a notification popped up.

"You have not downloaded the paper. Please try connecting to the internet."

Einstein and Tesla turned to look at Char.

Xia Ya also realized what was happening and said somewhat awkwardly, "We left in a hurry, and most of the offline data inside now consists of AI's own algorithmic thinking and data from general databases."

"So, we have to go to 2072 to look for it?" Einstein stroked his chin.

Char looked at the computer and continued, "Where can we get these papers?"

The AI ​​thought for a moment and then said.

"According to the latest information obtained before going offline, the United Front had formulated the 'Ark' project to preserve civilization knowledge for a long time after the apocalypse, possessing the most abundant civilization data and database."

Then a three-dimensional Earth appeared on the screen, with many red dots on it.

"This is the location of the data containers for the 72 'Ark' projects that were sent by the United Front before the internet was cut off. You only need to go to one place to find them."

Char looked at the map carefully and found that it was not only on the North and South Poles, but also on the moon.

The nearest database is located in a place called "Iron Mountain National Data Center," but it is still 100 kilometers away from Char's "birth point."

"Do we really have to go get it?" Xia asked.

"No matter what, it's still knowledge of the 'future'," Tesla said. "The magical system of this world is closely related to knowledge. If we can acquire this knowledge, it can save us many years of time and energy. It's not just the mind-accelerating magic we're currently conceiving of; perhaps all the magic we conceive of in the future will involve this knowledge."

"Right now, the biggest obstacle to getting there is Cindy," Einstein said. "But once you get rid of her, she can become your most powerful 'bodyguard' in that world."

"Shall I go now?" Xia asked.

The two remained silent, sitting on the sofa and gazing at the fireplace in front of them, deep in thought.

After a brief silence, Tesla said, "Wait a little longer."

"Your current methods are too limited. Even if that witch doesn't attack you and spares your life, it doesn't guarantee you won't get hurt."

While compressed hydrogen-oxygen spheres are powerful, they are also very noisy, making them too dangerous in an environment surrounded by monsters. Furthermore, their power is too dispersed, rendering them ineffective against heavily armored monsters.

He stroked his chin. "We need to create a third-tier spell that is penetrating, not too loud, and preferably capable of long-range attacks."

Tesla looked up at Xia, "You should go and rest first, adjust to the time difference. Don't you have a habit of taking a nap at noon? You should be able to sleep."

Xia nodded. To be honest, he was indeed a little sleepy.

However, he didn't rush to sleep. Instead, he went upstairs, took a quick bath, and then lay down on the bed...