The dynasty moved very fast.

When Zheng Xiaoming's parents walked out of the portrait room with their son dizzy, the little fat man was kidnapped by a terrible young man running ahead.

Lin Chen pressed Zheng Xiaoming's parents and said gently: "They may have some problems and need to ...... Communicate privately ......"

Xiao Ming's parents were at a loss, so Lin Chen had to invite the two parents to the lounge and make two cups of tea.

Through the glass window, you can see that Wang Chao is facing Xiao Ming, having a dialogue between chicken and duck, Wang Chao keeps talking, Zheng Xiaoming looks up blankly, and looks like I don't understand what you are talking about.

When the surrounding police officers saw the two of them like this, they all surrounded them curiously.

"Xiao Dynasty, are you speaking Chinese, why can't I understand a word?" A police officer next to him quipped, "The kid is going to be fainted by your questioning." ”

Wang Dynasty glared at the other party and waved his hand: "You mortals, don't disturb our communication!" ”

A moment later, a very bizarre scene happened, Comrade Zheng Xiaoming opened the dynasty, sat on Comrade Xiao Wang's office chair stuffed with cushions, faced Comrade Xiao Wang's computer was not stunned at all, and knocked down a few Chinese characters very decently, and then, a large number of pictures of high-rise buildings appeared, Zheng Xiaoming looked at one of the buildings, took a piece of paper, wrote down a string of values, and then jumped off the chair very well-behaved, put his hands on his stomach, and looked up at the dynasty again.

"Are you sure?" Dynasty asked.

Xiao Ming nodded.

All the police officers gathered around, but no one dared to speak.

Wang Chao snorted, jumped into the chair and began to operate the computer.

Lin Chen nodded to the two adults in the lounge and walked to the back of the crowd.

Several police officers got out of the way, and Lin Chen stood behind the Wang Dynasty's office chair, and the little fat man quickly rubbed against his legs.

Lin Chen had never understood the computer interface of the dynasty, the young man typed down a large piece of code, and then turned around to see a large group of people surrounding him, and said in horror: "Why are you all surrounding me, I am so terrible!" ”

"I heard that the murderer tied the murder weapon to the balloon and let it go?" A police officer asked.

"I heard you're going to get the murder weapon back?" Another officer asked.

"We're going to watch you pretend." The third person said.

Wang Chao "leaned" and was sentenced to a snap: "Speak well, how are you going to find it?" ”

"The most primitive search method is to pull the net in the whole city, we release the news, determine the last location of the balloon according to the eyewitness report information, and then judge according to the wind direction of the day, as long as the murder weapon does not fall into the water or is picked up by the aunt to wash and cut vegetables, it can always be picked up by the masses or searched by us, it is just a matter of time, right!"

"Nonsense." The torturer was not angry.

"I have a faster method, I can calculate the approximate location of the murder weapon, narrow it down to the size of five football fields, and if it goes well, we can find the murder weapon before dark today!"

"Explain." Torture Conglian said.

"That's right, there is a mathematical model in meteorology that specializes in finding the landing point of the weather balloon basket after cutting, and we can use this model to determine the possible landing range of the murder weapon after the balloon released by the murderer explodes at high altitude."

"But how do you determine exactly where the balloon exploded, there are too many possibilities, and it even has a lot to do with the gas inside the balloon, the weight of the knife, and the material of the balloon skin." The torturer paused and asked; "Are we going to do experiments?"

"Boss, this is also a primitive search method, but of course the experiment has to be done." Wang Chao smiled, "Xiao Ming's mother said that the balloon that the murderer gave Xiao Ming is the kind sold in the park, so let's buy a few later, tie a heavy object under it and release it, so as to find the last possible landing point of the murder weapon." The young man said as he handed over the values that Chubby had just written.

"What the hell is this?"

"Oh, my brother just figured out the weight under the balloon, which is the range of possible weights for the knife."

Lin Chen looked at the values on the paper: "How did this be calculated?" ”

"High school physics, estimating, just after teaching my brother the class, he understands, amazing!"

Lin Chen frowned and looked at the dynasty suspiciously: "Huh? ”

The dynasty was looked at very embarrassed: "Eh...... I'm just trying to see if he can understand it. In fact, there are not many knives that can be hung by three balloons and fly, not to mention that they can stab people to death, they must be light and sharp, I just asked the forensic department, and they have determined the model of the knife. I just asked my brother to do the math according to the method of physics, and there is a reference. In fact, at high altitudes, these weight errors are negligible. ”

"It's pure showmanship?" Lin Chen looked at the little fat man on Wang Dynasty's legs, very speechless.

Prisoner Lian took the paper handed by the dynasty, ignoring my brother who was open and closed in the young man's mouth, he waved his hand and asked the police to arrange an experiment by the lake in Paradise.

The people around the back of the dynasty computer were a third less.

Wang Chao shouted at the back of the departing police officer: "Remember to install GPS on it!" ”

The torturer broke the person's head back in front of the computer and continued: "There can be experiments, but the wind speed will change every day, what else can you do to finish it at once." ”

"Boss, here's another search I'm going to talk about." Wang Chao said that he was also a little excited, "Boss, you just said that the difficulty of calculating the final landing point lies in the time when the balloon explodes at high altitude, right, and there may be two explosions and one that does not explode, so the trajectory will be very erratic, so, what can we do to calculate the fluctuating balloon flight trajectory?" ”

Comrade Xiao Wang dragged out his tone, and no one paid attention to him, so he had to raise his voice and answer himself vigorously: "Radar." ”

"It can't be." "How can such a small balloon and underbelly be detected, and the weather balloon can be detected by radar because its own volume is 10-20 times the size of a normal balloon. ”

"Have you ever heard of the airport bird detection radar?" Wang Dynasty asked rhetorically.

"Go on." The torturer didn't even speak.

"Radar is the same, the specific principle I don't popularize science, commonly used moving target radar can detect normal high-speed moving targets, while suppressing fixed useless targets such as buildings, mountains, clouds, etc., but for small reflection cross-section, low-speed moving objects can not be identified, in order to detect this low-speed flight and small reflection cross-section through radar, it is necessary to improve the filtering algorithm, this algorithm is probably worth more than a billion."

The torturer glanced at him: "Let your brother Ah Chen stand here and listen to you talk nonsense for ten minutes, so there is no condition to talk." ”

Wang Chao was suddenly deflated, and could only say: "Let's go to the Aviation Administration and ask for a copy of the radar data after yesterday's incident, and I'll filter it, but the algorithm won't sell it!" ”

The time to find the murder weapon is not too far from what Wang Dynasty estimated, and the police want to find something, and if nothing happens, they can always get it.

Before that, Lin Chen had been sitting in the lounge, not saying much, and refused to arrange for the prisoner to send him to the hospital, he took off his shoes and sat cross-legged on the sofa, watching everyone in the police station get busy.

Zheng Xiaoming sat next to him to do his homework, and the parents of the little fat man still had to go to work in the afternoon, but because the child himself refused to go back to school to continue his classes, they could only leave people at the police station.

Lin Chen watched as the child held the pencil with his fist and tried to copy the Chinese characters in the notebook one stroke at a time. In fact, genius is not terrible to say, what is terrible is that genius itself has strong willpower, which can basically even destroy the earth.

When the prisoner came in, Lin Chen was touching the child's head and educating him to study hard at school.

"I thought you would suggest that his parents send their children to a gifted class to be with his kind." The convict took a glass of warm water and put it in his hand.

"Does Hongjing have such an elementary school?" Lin Chen asked. ”

"Uh......" Conglian smiled and squeezed to his side, "Why don't we open one?" ”

Lin Chen held the water cup and smiled.

"Your laugh is far-fetched, Advisor Lin." "It's not like the kind of smile that makes my heart sweet when you see me." ”

Lin Chen didn't take the joke.

"Ever since you knew that the suspect had released the murder weapon, your words have been very few." Torture Conglian finally said.

"No, I just find it hard to explain." Lin Chen took a sip of water, "I still think that is an unnecessary thing. ”

"Huh?"

"It's a balloon and a murder weapon, the target is too big, would a shrewd killer do that?"

"It's hard to say, it depends on the personality of the killer, he is born with some perverts, and he is very excited to kill people, and he can't wait to dance a striptease." Torture Conglian said.

"yes, so I think it's hard to explain this matter as well." Lin Chen shook his head, "If he is a professional killer, it should be impossible not to know that the police will find the murder weapon he released, he did this purely to get rid of the murder weapon as soon as possible, I can understand it." But why didn't he tie the last balloon to the murder weapon, but left with it, and finally gave it to Xiao Ming, I really can't understand such a state of mind. ”

"There is a theory that the murderer should quickly shoot the evidence related to the murder in batches, but it is not so reasonable to put it here to explain why he gave the balloon to Xiao Ming."

Lin Chen really didn't know what to say, and in the end, he could only say to Xing Conglian: "I think it must be that there is nothing wrong with me in this homicide case, so I have to find some meaning for myself." ”

"The criminal cong even said seriously: It's all because the dynasty is too capable, I'll go back and beat him."

Hearing this, Zheng Xiaoming, who had been doing his homework, raised his head, looked at the torture servant company with a frightened gaze, and moved his butt to the other side of the stool by the way.

This action was so cute that the torturer walked directly over and kissed the child's face.

Zheng Xiaoming's classmate and Wang Chao are probably really similar in some ways, he was kissed by the prisoner, he stood up without a sound, walked to the tissue box, took a piece from it, folded it, and began to carefully wipe the place on the side of his face that was kissed by the prisoner.

The torturer was dumbfounded.

At this moment, a very excited celebration suddenly erupted outside the lounge.

Lin Chen shook his head and glanced at the torturer.

A police officer rushed in and shouted, "Boss, that black bag has been found!" ”

"So fast?" The convict stood up and was very surprised.

"It happened to fall on a lawn in the suburbs, which was particularly conspicuous, Xiao Wang calculated the address, contacted the police over there, used a metal detector, and found it at once."

About 40 minutes later, the black plastic bag and the murder weapon wrapped inside were sent to the Hongjing Criminal Police Team, which was also wrapped with ropes and the wreckage of the balloon bursting.

Because the process of finding the knives was so exciting, when the physical evidence arrived, most of the forensic department and forensic doctors surrounded them.

The black plastic bag was carefully dismantled layer by layer, revealing the silvery-white, bloody blade within.

Everyone present felt a wonderful sigh of relief.

The criminal conglian stepped back from the front of the stage and said, "Let's get to work, first confirm that this knife is the murder weapon used by the suspect." ”

A sample of blood stained with the blade was extracted and officers of the Forensic Bureau began to examine fingerprints in the plastic bag and the scotch tape wrapped around it.

When the test results came out, Lin Chen and Xing Conglian were taking Zheng Xiaoming to eat in the cafeteria.

Zheng Xiaoming preferred the braised chicken thighs cooked by the chef of the police canteen, and in order to show the good virtues of brothers, friends and brothers, Wang Chao made an exception and took out 30 yuan from his small treasury to buy five chicken thighs, and gave them all to Zheng Xiaoming.

Lin Chen looked at Zheng Xiaoming, who had already eaten three whole chicken legs and was about to eat the fourth, and always felt that this was not good, so he silently moved the vegetable pot to a place that Xiao Ming couldn't hold, that is, in front of the Torture Conglian.

The convict glanced at the fingerprint report and asked with some surprise, "The fingerprints on the duct tape and the fingerprints on the notebook I brought back from Stancom's office are sure to be from the same person?" ”

"Yes." The police officer nodded, and handed the second piece of paper in his hand to the criminal company: "Then we analyzed the blood sample on the knife and confirmed that it belonged to the victim Stankang." ”

Xing Conglian nodded, sighed, and raised his chopsticks to put the chicken thighs into his bowl.

Suddenly, the officer continued: "At the same time, another set of DNA samples that did not belong to the victim Stancom were found on the murder weapon, and a match for the second set of DNA samples was found in the library. ”

Lin Chen raised his head suddenly, and the chopsticks of the torture conglian stopped in mid-air.

"Who is it?"

The police officer handed over the last piece of paper in his hand and said, "It's called Duan Wanshan." 166 Reading Network