Chapter 10 Chapter nine

"—In summary, Leuer concluded that during the period when the CO2 concentration dropped to 500ppm, the pan-world ice sheets were extremely developed; and the period when the estimated CO2 concentration was above 1000ppm, the earth also entered In addition to the research on CO2 concentration and the greenhouse effect, there are several researches based on geochemistry. Representatively, there is the "Snowball Earth" (Snowball Earth) in the Phanerozoic period 700 million years ago Earth) hypothesis, as well as the Raymond hypothesis, discussed the sharp warming of the earth 55 million years ago, and the gradual cooling of the earth since 40 million years ago, and its relationship with the Himalayan uplift. But around each hypothesis, Scholars on both sides continue to publish papers and have no answers yet. In the next class, we will study geochemical facts and explanations, and explain the 'Snowball Earth' hypothesis and the Raymond hypothesis."

"That's it for today." Qing Jiang bowed and walked towards the exit.In the lecture theater that can accommodate more than 200 people, there are only more than 20 students sitting there.The course of Earth Environmental Science is getting less and less popular year by year, the reason is unknown, maybe it is simply affected by the declining birth rate. He went back to his room, and there was a note on the desk.It was Tetsuko Ossi's neat handwriting, which reflected her rigorous personality: "I have a visitor, please wait in the research room." There is a business card next to it, which says "Nakaoka Yuji".Seeing the title, Qingjiang was startled: Criminal Division, Azabu North Police Station, Metropolitan Police Department.

Although I feel inexplicable, I am afraid that no one can keep calm when the police come to visit.Not to mention the criminal class.What's the matter?Aoyama felt uneasy.If it was traffic class, he had dealt with him a few times. Qing Jiang put the materials for class on the table and walked out of the room.The research room is next door.He pushed open the door without knocking. There are desks against the wall, and several students and graduate students are facing the computer.People come and go here frequently, even if the door is opened, no one responds.Even if it is a professor who comes in.

Wearing black-rimmed glasses, Tetsuko Ossie was sitting at the central conference table writing something.She also just glanced at Qing Jiang.A stranger sat across from him, and when he saw Qing Jiang, he stood up. "Are you Teacher Qingjiang?" "Yes. Uh," he looked at the business card in his hand, "is that Mr. Nakaoka?" "Yes. I'm sorry to bother you when I'm busy." Nakaoka looked less than forty years old, with a solid physique like an athlete, and a face that was tanned by the sun with the unique vigor of a criminal policeman.The suit on his body was not a famous brand, but it was tidy.

It shouldn't be because of something that doubts me, Qing Jiang thought.There is a paper bag next to Nakaoka, which seems to be a souvenir. "Come to my room and talk? It's next door." "Is it okay? Thank you very much." Nakaoka replied angrily, picking up the paper bag and briefcase. After returning to the next room, Nakaoka introduced himself again and handed him a paper bag.The bag was quite heavy, and Nakaoka said it contained red wine. "Because I heard that Teacher Qingjiang is a master of red wine." "It's not that... Who did you hear it from?"

"Mr. Isobe, the one from Akakuma Onsen." "Is that the thing?" Qing Jiang was confused.The countermeasure meeting was held last week. Nakaoka took out a notebook from his bag. "Teacher Qingjiang is in charge of investigating that accident, right? I have a few things I want to ask you about this matter, so I came to visit you. You are so busy, so you really shouldn't bother me. Could you please listen to me? sentence?" "It's not a problem, uh..." Qing Jiang looked at the business card again, "Why is the police officer in Azabu interested in the accident there?"

"Because Mr. MIZUKI lives in Azabu." "Mr. MIZUKI?" "It's the dead." "what……" He remembered, the Chinese characters are written as "Water City", and the name seems to be "Yiro", right? "About Mr. Shuicheng, I have a few points to investigate. Is it convenient for you?" "Oh." Qing Jiang nodded, still wondering.He knew nothing about the dead. "The first thing I want to ask is, is the accident unforeseen? I went to the local area yesterday, but there was a no-entry area marked there, and I said that it was delineated by you, teacher."

No, no, Qing Jiang waved his hands again and again. "I didn't delineate it, but it was decided after consultation with the countermeasure headquarters. I also listened to the opinions of the police and fire department." The implication is that this is actually a product of compromise.He still feels depressed thinking about that meeting.The fire department and the police have proposed that all areas where even a tiny bit of hydrogen sulfide be detected should be designated as no-go areas.But that would include almost the entire village, and tourism would be wiped out.So, what should the license value be?There is an argument surrounding this because it is not possible to apply one value to all regions.Even using the highest value in a month as a reference, it is likely to change with the climate.

Finally, a decision was made: temporarily designate the high-concentration area in this investigation as a no-entry area, and post warnings in other areas to discourage tourists from entering.However, it is scheduled to be re-divided next month. "Teacher, you also investigated a similar accident a few years ago, right? Can it be considered this way: in areas with hydrogen sulfide hot springs, there is more or less the danger of such accidents?" "Well, so to speak. And, it did happen." "Can it be known when and where?" Qing Jiang thought for a while, then shook his head.

"If it's a volcano, there may be some anomalies in the data before the eruption. However, it is very difficult, or in other words, impossible to predict an accident of this scale." He chose the words carefully, "Only It can be said to be an unfortunate accident. Even at the accident site, the concentration of hydrogen sulfide has never reached a dangerous level since that day. Although this time it was included in the no-entry zone, it was just in case." "Unfortunate chance. So what are the odds of this happening?" "Probability... I don't think it can be explained by numbers. The concentration has not increased for more than a month. I don't think it will happen a few times a year. However, if you don't continue to observe within a year, you can't be sure about anything. What's more , even if the concentration rises, it will be a local reaction, and it will be a matter of an instant, and the probability of someone standing there by chance may be said to be almost zero."

"Zero...that is to say, it is unthinkable for an accident to happen." "It is unbelievable, so it is necessary to investigate in detail." Nakaoka was fascinated by this, and leaned forward slightly. "Is it possible that it was not a coincidence? Can you think so?" "Isn't it a coincidence?" "That is to say," Nakaoka licked his lips, "it may be artificial." "Huh?" Qing Jiang stared at the police officer's face, "Human? What do you mean?" "Someone made hydrogen sulfide gas. A few years ago, a lot of people killed themselves that way, right?" Ah, Qing Jiang opened his mouth wide and nodded.He never thought about it. "That's what it means. No, I don't think it's possible." "why?" "If you want to talk about why... I want to ask a question instead. Why do you think so?" "The answer to this question, didn't I tell you just now? The probability of this accident happening is almost zero. Therefore, it is more reasonable to think that the accident was caused by human beings. Don't you think so?" "No, well," Qing Jiang shook his head lightly, "it's impossible. The probability of an accident is indeed almost zero, but it can't be said to be zero. However, the possibility of human-induced accidents can be said to be zero." "That's right. But many people have committed suicide with hydrogen sulfide." "That was indoors, right? This time the victim died outside." "Most suicides choose indoors. One is that they don't want to affect others, and the other is that it can increase the concentration of poisonous gas. Even if they are outdoors, if they choose a windless day and create poisonous gas around them, they can poison themselves, right? " Qing Jiang smiled wryly.This broke Nakaoka's mood, and his expression became serious: "Is what I said strange?" "Ah, I'm sorry. It's not strange, but I admire it very much. Your idea is very unique and unique. Unfortunately, it doesn't work. Mr. Nakaoka, do you know how to generate hydrogen sulfide?" "Look it up online. Like, mix it with some sort of body wash or detergent." "The frequently used body wash has been discontinued. Some people are always promoting some stupid methods. Not to mention, as you said, basically, mixing two liquids can produce hydrogen sulfide. And the necessary One thing is a container for liquid, so that poisonous gas can be produced to commit suicide, and this kind of container will inevitably be left on the scene. But the lifeguards did not find such a thing.” Nakaoka nodded. "I know. But it could have been put away." "Packed up?" Qing Jiang was about to ask who it was, but then thought of the answer, "You mean, it was put away by the wife?" "It's not impossible, right? She was the first to find Mr. Shuicheng's body. If she put away the container and the empty bottle containing the liquid, no one would find out." "Why did Madam do this? Make the suicide look like an accident. What is there—" At this point, Qing Jiang's mind flashed, "Ah, that's right. That's why the police officer in Azabu is going to be dispatched. Haha , So that’s the case. Well, the so-called police really have to suspect many things.” "You seem to have figured out something." Nakaoka was a little disappointed. "I figured it out. That's the one, right? To get the insurance money. Where did I hear that there is a regulation that the insurance money will not be paid for suicide. So you suspect that she disguised the suicide as an accident." Nakaoka said nothing.Instead, Qing Jiang kept urging: "What do you think of my reasoning? If it's about fraudulent insurance, you should talk to a law teacher." "It's not that, I just want to ask you, is it possible to realize the method I just mentioned?" "Impossible. All I can tell you is that it's unrealistic. Being near a container that's producing hydrogen sulfide is suicidal." Nakaoka rested his chin in one hand. "What about wearing a mask?" Qing Jiang was at a loss for words.Nakaoka also realized that he was talking nonsense, so he waited for the scholar to answer with a serious face. "Is there a motive?" Qing Jiang asked, "The victim's motive for suicide?" Nakaoka sat up straight. "Just asking you for advice, I'm also worried, so let me answer you. To be precise, I didn't find out the motive of Mr. Shuicheng's suicide. He is a famous producer with a lot of money, and of course there is no reason to force him to commit suicide." Dead-end debt." It was the first time Qing Jiang heard that the victim was from the film industry.To him, it was a race from another world. "So……" Hmm, Nakaoka thrust his jaw forward. "I also think that this may not be a suicide, but I suspect that this is not a simple accident. Therefore, various possibilities are being investigated." "Please wait a moment. Since it was not a suicide or an accident, the rest..." Qing Jiang hesitated whether to continue. "The doctor prescribed sleeping pills to the victim, Mr. Shuicheng. If he was given sleeping pills before leaving the hotel, he might feel tired while walking in the mountains. He wanted to take a rest, and after sitting down, he might just fall asleep like this. Then immediately create hydrogen sulfide around him, and leave the scene. Ten minutes later, put on a gas mask and return to dispose of the container. What about this possibility? You won’t say that this is absolutely impossible, right?” Nakaoka finished his words lightly, He cast a challenging look at Qing Jiang. Qing Jiang licked his lips. "Does the Metropolitan Police Department think this is a murder case? And the murderer is the wife of the deceased? But the local police don't seem to think about it at all." Nakaoka smiled slightly: "Yes, why is that?" "Is it because of suspicion that you said these words?" "The police just want to doubt all possibilities. Don't talk about this, I'm still waiting to hear your opinion, teacher." Qing Jiang shook his head and said, "I think it's impossible to commit crimes like this." "why?" "I said it just now, because it is tantamount to suicide. If you want to be poisoned outside the house, you must produce a considerable amount of gas. It is very dangerous to approach at this time, even if you wear a gas mask. You must wear chemical protection What’s more, what should be done with the remaining liquid in the container? If it is dumped at the scene, it will definitely be discovered by the lifeguards who came later.” Nakaoka listened to Qing Jiang's explanation and nodded with great interest. "So that's the case. It does sound difficult." "There are so many things the police suspect." "That's our job." "There is a sentence that I don't know whether I should ask. Is there a motive? Is that the wife's motive for killing her husband?" "Well..." Nakaoka was vague. "By the way, I heard that the lady is quite young. Is it for the inheritance?" Nakaoka smiled wryly: "It's up to you to imagine." "When the bourgeoisie dies, the police have worked hard. They can't just let it go." "You are right. But in this case, the suspicion is not just because of motive." "How do you say that?" "As a criminal policeman, I also want to give myself a sigh of relief. Oh, you better not ask, it has nothing to do with you. I have already wasted a lot of your time. Thank you very much today." Nakaoka bowed his head politely After thanking him, he strode towards the door.