In the darkness of nothingness, the sound of water droplets falling on the stone slab echoed endlessly.

Covered in bandages, Karin lay on the cold stone bed, every inch of her skin in agony as if it had been scorched by flames.

"Water ......"

With all her strength, Karin squeezed a word out of her throat.

After a long wait, just when she thought the world had abandoned her, a cool spring touched her lips and tongue.

Opening her dry and cracked lips, Karin swallowed the water greedily, feeling the power of life return to her body.

Slowing her breath, Karin, who didn't know how long she had been unconscious, tried to open her eyes and see where she was.

After some attempts, she found to her horror that everything was in vain, and that there was still darkness in front of her.

Stretching out his hands and touching his face, the heavy bandage made Karin panic: "My eyes! What's wrong with my eyes?!

No one answered her.

Struggling to get up from the stone bed, Karin was about to get off the ground, but her weak body caused her to fall to the ground with a stumble.

A pair of strong hands lifted Karin and carefully lowered her back to the stone bed as if she were holding a priceless treasure.

Frightened, uneasy, and annoyed, Karin coughed violently and asked loudly, "Who are you?!let go of me!"

No one answered her.

Karin curled up in a corner of the stone bed, her hands fumbling around, trying to grab anything she could defend herself from.

Suddenly, she remembered the soul space.

But to her surprise, no matter how much she called for the soul space, the response she received was only dead silence.

Ten minutes passed.

After some struggle, Karin grew desperate.

She leaned her back against the wall on the side of the stone bed, sat there dumbfounded, and asked, "Where is this?"

No one answered.

"What do you want to do with me?"

No one answered.

......

Karin clasped her hands around her knees, buried her head in her head, and began to cry quietly.

The owner of the big hands, seeing Karin crying, was a little overwhelmed and made some strange noises.

In the end, he left.

Karin, who was alone, sat alone on the cold stone bed, crying even louder.

Half an hour later, to Karin's surprise, the strange man returned.

As the footsteps got closer and closer, Karin, who couldn't see, stopped crying in fright, and her body kept hiding backwards.

A thing was delivered to Karin.

The aroma is mixed with the smell of grilled meat and spices.

Karin swallowed, then turned her head around stubbornly.

The weirdo brought the food closer, and his mouth lit up some bytes of unknown meaning.

Karin quickly reached out and grabbed the roast wrapped in oiled paper, ignoring the temperature and greasy attachment from the paper, and stuffed the meat into her mouth like a hungry wolf.

Seeing that Karin was finally willing to eat the food, the strange man happily made a strange sound of "Hehe".

Twisting her head to the source of the sound, Karin yelled, "Shut up!"

The strange man quickly covered his mouth with his hand and turned away obediently, not daring to look at Karin again.

Outside the door of the room, from beginning to end, stood a withered old man.

He didn't say a word, didn't move, just watched it all quietly.

Imperial Capital, Baghdad University, Hall of Truth.

"I don't understand, how can there be an invisible force that is pulling everything down, where does this power come from, and how does it come to be?"

An Imperial student dressed in white and wrapped in a turban, standing on the podium holding a book called "Introduction to Gravitational Mechanics", shook his head and said: "The idea of this scholar in Twilight City is too whimsical, and I have only seen hypotheses and inferences throughout the book, but there is no evidence that can stand up. ”

Another student in the audience stood up and retorted: "Any discovery of truth begins with assumptions and inferences, and it would be too arbitrary to deny this book on such grounds." ”

The latter student continued: "Take, for example, a well-known example written in the book, where a stone and a block of iron of the same size and weight are allowed to fall vertically from a high place, and they can all end up landing at the same time, whenever and wherever they are. Therefore, the fact that things of different weights and materials fall at the same speed in the air proves that from within the earth, there is an equally huge force pulling everything towards the ground. ”

"Ridiculous!" the first student retorted, "I'll give you a counter-example, throw a ball of paper and a piece of iron of the same size at the same time, and the first thing to hit the ground must be the piece of iron, so how do you explain that?"

Listening to the students in the Hall of Truth, who were constantly arguing over the theories in the book, Saladin, the imperial caliph sitting in the guest seat, not only did not have any annoyance, but nodded frequently.

Elem, the captain of the Caliph's guard, approached Saladin's side with a frown, and whispered, "This group of students is too noisy, it's not good for your health, why don't I let them be quiet?"

Saladin shook his head and said, "You don't understand that the voice of truth should not be silenced, should not be compromised, should not be compromised. ”

Elium scratched his head, puzzled.

Saladin looked at the captain of his guard and said with a smile, "Don't worry about my body. ”

Elium glanced at the emperor secretly, and the other party's increasingly thin body and bloodless face made him hang his head and sigh secretly.

After some debate, the students still did not reach a unified opinion.

Saladin waved his hand, motioning for them to take a moment's heel.

Immediately everyone stopped arguing and arguing, and stood in the hall with their heads bowed, respectfully awaiting the caliph's admonition.

"This "Introduction to Gravitational Mechanics" was written by scholars at the University of Twilight, and although the translation had just been completed, it was completed two years ago. ”

As soon as Saladin said this, the room was full of surprise.

Beginning with this "Introduction to Gravitational Mechanics", in the past two years, the University of Twilight has published a series of works such as "Spatial Analysis of Gravity Mechanics", "Introduction to the Study of Rigid Body Statics", "Equilibrium Mechanics Equivalence Analysis", "Sagittal Moment Theory of Mechanics", "Frontiers of Fluid Mechanics", "Theory of Elementary Structural Mechanics" and so on. ”

Saladin said with a wry smile: "The scholars of the Wenxian Academy are working overtime to translate these works, but due to the relationship between technical terminology and theoretical basis, the translation work is difficult. ”

"Why am I saying this to you today?"

Saladin patted the book in his hand, "I've heard that many of you are often complacent and boastful about solving a so-called puzzle or making an interesting machine. ”

"What you don't know is that in the north, not far from the empire, there is such a kingdom, such a university, and such a group of scholars, and none of the books they write can be understood by any one in our country!"

Saladin's voice grew louder and louder, until at last he stood up and shouted almost with all his might.

The students looked at each other, blushing and silent.

"Blind arrogance is blasphemy against Allah and a sign of betrayal of the truth. Saladin gasped and sat down tremblingly, "From today onwards, I will distribute these materials to everyone. Of course, there will be the same books on my desk, and I will study with you. ”

A guard walked through the gate and walked up to Elem's side, whispering something in the latter's ear.

Soon, Elium came to Saladin's side and whispered a word.

"The laryngeal bone is back. ”