Kewpie raised his head and looked at Fang Mu: "Hatcher, do you know this?"

"I know a lot. So Kewpie, can you not hide the connection between the witch and the magical girl, and give the three young ladies a good science popularization?" Fang Mu said, "Of course, if you don't want to say it, I can say it for you." ”

Sayaka looked at Fang Mu and Cuppy curiously and asked, "The connection between the magical girl and the witch, what is that?"

"Aren't you going to say it yet? Fang Mu took out a notebook and pen from his schoolbag, wrote the two nouns witch and magical girl, and then looked at Ba Asami and said, "Senior Sister Ba, how do you think the witch was born?"

"The birth of a witch?" Asami hesitated, "Should it be a negative emotion or a curse in people's hearts?"

"Wrong, witches are indeed good at triggering negative emotions in human hearts, but witches are not born from negative emotions. Fang Mu drew an equal sign between the witch and the magical girl.

"What does that mean?" Madoka said, confused.

"Kewpie didn't deceive you, but it hid a lot of truths. Fang Mu tapped the notebook with the tip of his pen, paused and said, "For example, it conceals the fact that the witch is actually a magical girl!"

Ba Asami was stunned for a moment and looked at Cuppy: "The witch is a magical girl?"

"That's right, witches are magical girls. You have sown hope, but you have the fruit of despair. That's fate. Miracles are not free, and praying for hope will sow the same despair, and it is all balanced. Fang Mu supported his chin with both hands: "Kewpie, in fact, it is more appropriate for you, after all, you are the person concerned." ”

"Kewpie, is what he said true?" Asami looked at Kewpie, and her reaction was a little plain. Fang Mu also thought that Asami Ba would collapse, after all, in countless reincarnations, there was such a regret, Ba Asami had a nervous breakdown after knowing that the magical girl would become a witch and smashed the soul gem of Kyoko Sakura with one shot, and then was shot by Madoka with an arrow to shatter her own soul gem.

"It's true. In this country, women in their formative years are called girls, so you who will eventually become witches should be called magical girls, right? This is the fate of magical girls. Kewpie's tail moved: "But if you keep using the Seed of Sorrow, don't worry." ”

"Don't you have to worry about using the Seed of Sorrow all the time?" Fang Mu's mouth hooked up a smile, he looked at Madoka and Sayaka and said, "Madoka Shikame, Miki-san, do you know why Xiao Meiyan is reluctant to ask you to sign a contract to become a magical girl? Is it because you are afraid of competition? No, I used to see Takiwara, but there were five magical girls. Xiao Meiyan is actually really thinking about you. By the time you signed the contract to become a magical girl, you were already dead. ”

"Already...... Dead?" Madoka and Sayaka obviously didn't understand the meaning of Fang Mu's words, Fang Mu looked at Sister Ba Ma Mei and said, "That's it, Sister Ba, you put the soul gem here, and then walk some distance with Sayaka, and I will prove something to you." ”

Asami hesitated for a moment, opened her hands, and a soul gem that glowed yellow appeared in her hand. Asami put the soul gem on the table, and then looked at Sayaka, who nodded and got up to stand with Asami.

"Go casually, after walking a certain distance, Sayaka, you will understand why I want you to follow. Fang Mu spoke confidently, although he was a little unclear, but Asami Ba still left the café with Miki Sayaka and walked not far away.

"Fang Mu-san, why do you have to ask Sister Asami to leave? Madoka asked Fang Mu strangely.

"Soul Gem, do you think this is a good thing?" Fang Mu picked up Ba Asami's Soul Gem, "Do you know what is sealed in this?"

"Seals?"

"That's right, inside the soul gem, it's the soul of a girl, if nothing else, there should be something wrong with Sayaka's side. You can take the soul gem and go over for a moment. Fang Mu threw the soul gem to Madoka, who caught it, hesitated and ran out of the café.

"Fang Mu, what the hell are you ......" Kewpie looked at Fang Mu, no expression could be seen on its face, but Fang Mu could feel Kewpie's shock.

"Who the hell am I?" Fang Mu touched the hair on Cuppy's back: "I, I said I want you to believe it or not." ”

At this moment, Madoka Shikame, Asami Ba and Sayaka Miki returned to the café, and from the stunned gaze of Asami and the other two suspicious eyes, Fang Mu knew that he had succeeded.

"What's the situation then?" As soon as she returned to her seat, Asami quickly asked Fang Mu, "Why did I fall unconscious without the Soul Gem." ”

"I said, soul gems aren't a good thing. That's because when you sign the contract, your soul is sealed in a soul gem, which means that you are now a corpse, acting entirely on the soul gem. I'm not wrong, incubator. ”

"You're right, I'm curious why you know so much about the secrets of the Soul Gem. ”

"It's a no-no. The corners of Fang Mu's mouth rose, his goal had been achieved, although he didn't know why Xiao Meiyan of the seventh week needed to save herself, but as long as he stopped Madoka from signing the contract, it would be fine.

"Kewpie, you deceived me. Asami still looks very calm, this calmness is like the calm before the storm, Fang Mu estimates that the reason why Asami didn't collapse is because he hasn't seen the process of a magical girl turning into a witch with his own eyes.

"Deception? I'm sorry, I can't understand the so-called deception itself, why do humans always hate others when they regret their own mistakes?"

"You didn't tell me that at all. ”

"It's not that I didn't say it, it's that you didn't ask. And Asami, do you have any other choice when you sign the contract?"

"But I almost led my junior sister down this path!" Asami's voice raised a little, and everyone around looked at her.

"I don't understand why you have such a big reaction, now that the world's population is 6.9 billion, and there are 10 more people every four seconds, why do you cling to the life and death of a single individual?" Kewpie continued to say with a harmless expression.

"Alright, that's the end of the decryption. Ba Asami's expression was a little terrifying, Fang Mu interrupted the conversation between the two in time, otherwise he felt that Ba Asami would take out a flintlock pistol in the next second.

"I'll tell you everything I know about Kewpie. Fang Mu cleared his throat: "This guy's real name is Incubator, which means incubator, and he is a product of an alien civilization. In order to prevent the entropy of the universe from increasing and avoid the arrival of heat death, the civilization has developed a technology to convert feelings into energy, but the civilization species itself does not have feelings, so it looks at the human girls with the most abundant feelings, and uses their hopeful hearts to capture the huge energy generated by their hearts from hope to despair, and from magical girls to witches. ”

"I'm getting more and more curious about your identity now, Fang Mu. Why do you even know all this, you say that you are hope, so what is hope? Why did it appear at this time?" Kewpie asked as he circled around the table, then looked at Fang Mu.

"I don't really know that much, I've just finished telling all the information I know. Fang Mu spread out his hand and made a helpless expression: "Then Kewpie, tell me that Madoka is the character you must sign a contract with, or is Madoka's talent very good?"

"No, Madoka's talent can only be said to be better than ordinary, but it's not a character I have to contract. Cuppy shook his head: "It's you, I'm curious about you now." ”

"I think so. Fang Mu finished his coffee in one gulp, stood up and prepared to leave: "That's all there is to say." The secret of the magical girl is actually very simple, that is, the girl who signed the contract died from the beginning, and finally fell into a witch because of despair, and Kewpie used this huge energy to maintain the entropy of the universe. ”

"Fang Mu, wait a minute. Madoka suddenly grabbed Fang Mu: "What is entropy? Is there no other way? Becoming a witch or something, it's too much!"

"There is no way. Fang Mu shook his head: "I know that Classmate Lumu is thinking about Senior Sister Ba, but in fact, even I can't help it. This is irreversible.,Witches will never become magical girls.,Magical girls won't become ordinary girls.,All of this is already doomed when you make a wish.。 Although it is very excessive, there are many examples of life threatened like Sister Ba and there are no way but to contract, perhaps Sister Ba is lucky, she survived from another angle. ”

"As for you asking me what entropy is? That's a real problem. Fang Mu grabbed his hair, hesitated for a moment and said, "The reason why Kewpie fooled the underage stumbling girl into a magical girl is to reverse the increase in entropy in the universe. Entropy is one of the parameters in thermodynamics that characterizes the state of matter, and is usually represented by the symbol S. ”

"In classical thermodynamics, the usable delta is defined as dS=dQ/T reversible. where T is the thermodynamic temperature of the substance, dQ is the heat added to the substance during the entropy increase, and the subscript is reversible to indicate that the change process caused by the heating process is reversible. If the process is irreversible, then dS>(dQ/T) is irreversible. The entropy per unit mass of matter is called specific entropy and is denoted as S. Entropy was originally a state of matter parameter that reflects the irreversibility of spontaneous processes derived from the second law of thermodynamics. Oh yes, this is a differential in higher numbers, and I guess it's a little hard for you to understand. It's better to check it out when you get home. ”

Fang Mu paused for a moment and said, "In short, entropy is the total number of possible permutations and combinations of the molecules of an object. The second law of thermodynamics states that the total amount of entropy in an isolated system continues to increase, and to put it bluntly, the η of your heat engine can never be equal to 1. However, the total entropy of the universe will not increase, so sooner or later the available energy in the universe will be exhausted, which is one of the possible outcomes of the universe: heat death. The second law of thermodynamics that produces entropy is stated by Clausius that heat can be spontaneously transferred from a hot object to a low temperature object, but it is not possible to spontaneously transfer heat from a low temperature object to a high temperature object, and Kelvin-Planck stated that it is impossible to draw heat from a single heat source and completely convert this heat into work without any other effects. In short, η> 100%. ”

Looking at the other three people with a confused face, Fang Mu sighed: "This is a serious physics science popularization about entropy, and the next is a serious speculation." ”

"The civilization of the incubator should have invented a technology to convert the feelings of intelligent life into usable energy, and the energy conversion efficiency obtained through this technology is η> 100%, which means that the emotional energy transformed by human beings through Kewpie's technology is greater than the energy to maintain the biochemical reactions of the brain. However, as the inventors of this technology, they had no feelings, so in order to avoid cosmic heat death, they decided to pit the earthlings after some investigation. Kewpie came to the earth when it was still and only primitive civilization, in order to let humans reproduce more, they began to raise humans, the feed is the resources consumed when secretly promoting the development of human civilization, and the harvest is the hope of the girls when they become magical girls and the despair of magical girls when they become witches, turning them into energy for recycling. ”

"As for the very small number of magical girls, there is a reason.,Different human beings produce different emotional energy efficiency.,Among them, the girls in the second sexual period are the most efficient.,Kuppy chooses a group of people with the best magical talent to make a contract.,And this group of people.,It's you who can see Cuppy.。 ”

"I should be able to understand what I said, right?" Fang Mu thought that what he said was already very simple.

The first person to praise it was actually Kewpie: "It's so wonderful, if you can't be sure that Fang Mu is from the earth, I really doubt that you and I are the same kind." ”

"I'm sorry, I'm a superior being than you. This sentence Fang Mu did not exaggerate at all, even if it appeared in the real world, Kewpie was an individual who could never be separated from this universe, Fang Mu really had a natural sense of superiority over it.

"Let's make a deal, then. Kewpie's tail was put into a question mark: "I give up the contract between Mayaka Kame and Sayaka Miki, on the other hand, you and I will sign a contract." ”

Fang Mu pointed to himself, and then shook his head: "I'm sorry incubator, this deal is inherently unequal, not to mention the conversation just now, will Mayaka Shikame and Miki Sayaka listen to you and sign a contract with you." My soul, the price you have to pay is too great. ”

"I think you have that value. ”

"Interesting. Fang Mu snapped his fingers, and the time around him stopped at this moment, only the only ones who were not affected were Asami, Madoka Shikame, Sayaka Miki, and Kewpie.

"This feeling...... Soul Gem?" Asami looked at Fang Mu in surprise.

"That's right, soul gems. Fang Mu opened his right hand, and in his hand, a soul gem with a strange shape exuding an aura of despair was slowly turning.

"I told you about Kewpie, the price you have to pay is too great. Seeing this, do you still have the confidence to say that you want to sign a contract with me?"