Perhaps the previous question had aroused the enthusiasm of the students. The classroom was noisy and much livelier than usual.
Another student raised his hand and asked, "Teacher, teacher, can you tell us about nuclear weapons? The book says that they are the most powerful weapons created by mankind. How powerful are they?"
Teacher Yu waved his hand and stopped the other students from asking questions. He smiled and said, "Alright, everyone knows that the most powerful weapon that humans have created is a nuclear weapon, which is also known as an atomic bomb. How powerful is an atomic bomb? Simply put, the shock waves it produces can shake the earth's crust. The temperature at the center of the nuclear explosion can reach hundreds of millions of degrees Celsius. Almost no matter in the real world can withstand it. Everything at the center of the explosion will be vaporized.
"What's the difference?"
Teacher Yu explained, "According to the law of conservation of energy, the total amount of matter in the universe is constant. Vaporization means that matter transforms into other forms of existence, such as light, heat, and so on, but it will not disappear."
Qian Yuan was speechless and said, "Such power and such high temperature. Ferocious beasts can't withstand it!"
Teacher Yu was silent for a moment and shook his head. "When something reaches a certain height, it will!
It can't be measured by the concept of matter. "
…
The bell rang for a long time before the students finally reacted and ran towards the school cafeteria in a huff.
Qian Yuan also picked up his cutlery and muttered, "This old man is getting more and more shameless. The stories he tells are getting more and more mysterious."
Then he said to Zhang Xiaofang, who was sitting at the next table, "Brother Fatty, is it still the same?"
Zhang Xiaofang nodded and turned to look at Teacher Yu's hunched back in the corridor. He was deep in thought.
Not long after, Qian Yuan ran back with five or six rice pancakes and a large plate of food. He put the food on Zhang Xiaofang's table and said, "Brother Fatty, you eat first. I have something to do." After that, he disappeared again.
Zhang Xiaofang had a big appetite and finished all the food in a short time. After eating, he took out a book on electromagnetism and began to read.
All the records and knowledge about electromagnetism had been erased after the catastrophe. Even the word "electricity" had disappeared. Now, the fundamental force that constructed matter had reappeared in the world.
The Theory of Electromagnetism was a book that introduced the effects of electromagnetism in all aspects. The specific author was unknown. It was precisely because of the emergence of electricity that the complex crisis that mankind had been facing in the past two years had gradually been alleviated.
Electromagnetic force was different from the energy produced by chemical reactions such as fuel and gunpowder. It was more efficient and had more comprehensive effects. It could cover almost everything.
Therefore, the engineering school had a new subject, electrical engineering. Zhang Xiaofang was very interested in electrical engineering. In a month's time, there would be an electrical qualification exam. If he passed the exam, he would be able to work in a thermal power plant.
He had two dreams and was faced with two choices. One was to travel the world with Old Zhang, and the other was to have a family and a stable job in Hope City.
The reason why he had a second dream was because of a woman, a woman that he had been secretly in love with for a long time. This woman was called Lu Yun, a teacher at the school. Although she was a teacher, she was actually not that old. She had directly started teaching after graduating last year, and was only two or three years older than him.
After school in the afternoon, Zhang Xiaofang slowly walked back home. Along the way, he was thinking of asking for help. If the government didn't care, then he could only ask the business group.
Last night, the two rats were so big. There was a high chance that they were in the growth stage or even the mature stage. Most probably, even a Physique Warrior wouldn't be able to deal with them. Only a Physique Master could do it. However, he didn't know any Physique Masters.
Unknowingly, he arrived at the small alley again. Lu Yun lived here. She hadn't gone to class for two days, and there was no news of her applying for leave.
Zhang Xiaofang was a little worried. When he arrived at her door, he looked left and right. This time, he didn't knock on the door. Instead, he directly climbed over the wall.
Just as he entered a room, he heard a series of low footsteps coming from the living room outside, followed by the sound of a mop. At the same time, an inexplicable chill spread out. Could it be that Lu Yun was already back?
However, he didn't hear the sound of the door opening.
Zhang Xiaofang gently pushed the door open a gap and peeked outside. In the dark room, there seemed to be a naked figure mopping the floor. It was very similar to the old woman he saw last night.
In his memory, Lu Yun didn't have such a relative. Zhang Xiaofang hesitated for a moment before he boldly pushed the door open. Just as he was about to ask, the old woman disappeared.
He scratched his head. There were still traces of water on the floor, proving that it wasn't an illusion. What the hell!
Just as he was a little scared, the traces of water on the floor suddenly formed a layer of frost and quickly spread up. In an instant, a bone-piercing chill surrounded him. His whole body was frozen stiff. He tried hard to move but couldn't. It was as if his body didn't belong to him. He couldn't control it at all. He even lost his sense of touch, sight, and hearing.
At this critical moment, Zhang Xiaofang's mind flashed with an idea. He used all his strength to bite the tip of his tongue. A hot stream gushed out from his mouth. He vaguely heard a scream in his ear. The stiffness disappeared and control of his body also returned to his hands.
When his eyes recovered, the first thing he saw was an old face full of wrinkles floating in front of him. It was looking at him with a strange smile.
"What the hell is this!"
Zhang Xiaofang had goosebumps all over his body. He instinctively punched out.
However, this punch hit empty air. The old face in front of him was like a cloud of smoke. His fist directly went through it without any feeling of touch.
"Heh heh …" The old face grinned at him and let out a sinister laugh. Then, it slowly disappeared.
Zhang Xiaofang finally found Lu Yun. She was lying in the room next door. She seemed to be sleeping soundly. There was a sweet smile on her face, but her cheeks were sunken. Her whole body was only skin and bones like a mummy.
Zhang Xiaofang hurriedly rushed over and patted her face. He anxiously called out: "Teacher Lu, wake up."
No matter how he called out, even when he tried to pinch Lu Yun, there was no response. If he didn't feel her faint breathing, Zhang Xiaofang would have suspected that she was already dead.
Just as he was panicking, a strong sense of danger rose up again. His body and mind instantly focused. There was a sharp sound of something breaking through the air behind his head. He only had time to slightly tilt his head. He felt a sharp pain in his shoulder. A sharp fruit knife was stabbed into his shoulder.
In the darkness of the room, an old woman with a shrimp-like body slowly appeared.
Zhang Xiaofang suppressed the fear in his heart and asked: "What the hell are you?"
The old woman replied sinisterly: "I'm so hungry. Little guy, let me eat you." As her voice fell, she turned into a gust of cold wind and rushed over.
Afraid that this thing would hurt Lu Yun, Zhang Xiaofang didn't dare to run. He could only wave his fist to meet it. Similar to last time, this punch seemed to hit a ball of cold air and passed through the old woman's body.
However, the old woman didn't seem to be able to hurt him. Her figure also passed through his body. It was as if she was drenched in ice water. She was sick to the bone.
After the old woman realized that she couldn't hurt him, she let out a hoarse groan. She began to control all kinds of objects and they flew at Zhang Xiaofang like raindrops.
The room was very small. In addition, he was afraid of hurting Lu Yun, so Zhang Xiaofang could only not dodge. The power of the objects that the old woman controlled was not inferior to the attack of a body technique cultivator.
Not long after, Zhang Xiaofang's face was bruised and his body was covered in blood. Fortunately, there was nothing in the room other than his fruit knife. He could still hold on for the time being.
Not long after, the old woman had taken apart everything in the room, including some tables and chairs. When she realized that she still couldn't do anything to Zhang Xiaofang, the old woman screamed angrily. She picked up a sharp wooden stick and pounced at him again.
Zhang Xiaofang cursed inwardly. He couldn't hurt this thing at all, but this thing could use objects to hurt him. Moreover, using objects directly was definitely more powerful than controlling objects.
Seeing the old woman pounce at him again, he could only raise his fist to meet it again.
This time, his fist landed directly on the old woman's head. Unexpectedly, the feeling of this punch was different from the previous ones. It was as if he had hit a soft, solid body, and the power was beyond imagination.
"Ah …" Accompanied by a shrill scream, the old woman could no longer maintain her body. With a bang, she burst like a balloon and turned into a cloud of thick black mist.
The few spots of scarlet blood on the black mist were unusually eye-catching. They slowly corroded the black mist like sulfuric acid.
Zhang Xiaofang looked at his fist in confusion. It turned out that he had been injured. Fresh blood had dyed his entire hand red.
"Stinking brat, I want your life!" A hateful scream came from the black mist. A large cloud of black mist charged at him.
Zhang Xiaofang was not afraid. Instead, he was happy. He had finally found a way to hurt this damned thing. He endured the pain and dyed his left hand with blood. Then, he flew toward the black mist.
This time, every punch was like hitting a balloon. At the same time, there was a continuous sizzling sound. The black mist that the old woman had turned into became smaller and smaller. Her voice also became weaker and weaker. Not long after, there were no more sounds. The black mist also disappeared.
Zhang Xiaofang looked at his blood-covered hands. Such a terrifying old ghost had died just like that?
He stood there in a daze for a while. When he came back to his senses, he hurriedly carried Lu Yun and rushed out.
… …
Accompanied by a cloud of black mist, Teacher Yu slowly walked in. He looked at the traces of water on the ground and frowned.
Life forms from the Hungry Ghost Realm had spread to every corner of the world. Although they were terrifying and difficult to deal with, they were limited by the rules of matter. In fact, it was difficult for them to show too much harm.
The rules of different worlds were different. Ghosts were not harmed by physical attacks. Therefore, they did not have strong physical attacks. Because they were abandoned by the energy of heaven and earth, they did not have the ability to control energy. However, this hungry ghost obviously had the ability to control water energy. It was a water ghost!
It was not only the hungry ghost that had quietly mutated. The demonic beasts that had appeared last night also seemed to have changed the rules of the world as a whole!
He closed his eyes. A shadow that emitted starlight faintly floated out from between his eyebrows.
In an instant, the entire city was enveloped by his spirit.
From a small tree, a rock, to a large human being and other creatures, everything was filtered through his consciousness.
When he was in the state of a four-dimensional soul, the three-dimensional world had almost no secrets to him.
He could see what had happened in the past through the timeline of the four-dimensional space. He could also see what would happen in the future.
However, this process of "seeing" was like watching the changes in the mountain range when he was in the mountains, watching the changes in the world when he was on Earth, or watching the expansion of time and space and the rotation of galaxies when he was in the universe. It was difficult to understand.