From the pastor's home, the police found a lot of physics books, and a person who has left school and is not teaching will have so many books on the bookcase at home, indicating that this person is very interested in the content of the book, and even said that this person has studied the content of the book.

These books are both new and old, and the old books are not yellowed and old because of age, but they show the characteristics of being turned over. As you can imagine, the owners of these books are looking through these books every day. This finding is also highly consistent with Shen Cheng's speculation.

The pastor's surname is Lowe, and everyone calls him Pastor Lo.

It seems to be obvious that Pastor Luo is interested in physics, and even has a lot of research, which is why he has so many physics books at home, so Pastor Luo used his knowledge of physics and the principles of mechanics to kill Luo Danan. And the person who gradually analyzed the religious killing and found Pastor Luo was Shen Cheng.

When I saw those physics books, Shen Cheng's reasoning had completely convinced me that Pastor Luo was the murderer nine times out of ten. At that moment, I glanced out the window, and I realized how the killer had detonated the gas canister.

Pastor Lowe seems to have a soft spot for physics, and if he can use the principles of physics once, he will use it a second time. I think Pastor Lowe also used the principles of physics to detonate the gas canister. The gas canister is going to be ignited, and in that case, there are only two possibilities.

One is that the gas is already highly leaking, and the flammable and explosive gas fills the entire room, and then the spark instantly detonates the entire room. But the situation does not seem to be very reasonable, according to eyewitnesses, Chen Zhaodi was stir-frying at the time, in that case, if the gas had leaked, Chen Zhaodi would definitely smell it, and she would not have dared to open fire.

Therefore, there is only one other possibility, the gas leaked when Chen Zhaodi was stir-frying. The gas canister is made of metal, and it is unlikely to break or leak without a strong impact, so it should be the gas pipe that leaks. The trachea is made of a material similar to that of a rubber product.

When I went to Chen Zhaodi's house to investigate, the gas tank and gas pipe had been blown up beyond recognition, but the gas pipe and gas pipe used in this place were the same. The trachea of that material does not leak under normal circumstances, but if it is used for a long time, the trachea is easy to deteriorate, resulting in leakage.

If the trachea is aged, coupled with a few external factors, the trachea is very prone to leakage, for example, chemicals burn or explode when heated. After a gas pipe leak, a small area of combustion and explosion will spread along the rapidly leaked gas to the inside of the gas tank, causing a powerful explosion.

I would have thought that the murderer would use physics to commit a second crime, not only because Pastor Luo's house hid a lot of physics books that seemed to be read regularly, but also because, standing at the window of Pastor Luo's house, his eyes could just fall on the window on the second floor of Chen Zhaodi's house.

Our location is on the third floor of Pastor Luo's house, and Chen Zhaodi's house is diagonally opposite Pastor Luo's house. Chen Zhaodi's home has been shocked beyond recognition by the explosion, and the police have restored the original layout of Chen Zhaodi's house.

According to my impression of the layout plan, standing in this position, the place that can be seen is exactly the stove part on the second floor of Chen Zhaodi's house. They are all poor people, the stove is not decorated, and the gas canisters are placed in front of the stove, according to the height of the stove, window sill and gas canister, this place can be seen at a glance.

If the human eye can see, it proves that the light can connect these two locations in a straight line, and even the aging trachea will not burn or explode for no reason, which must be due to external factors. I do not believe that the well-calculated murderer kills by luck, that is, the explosion was also controlled by him, including the time of the explosion.

It seemed impossible to make a gas tank explode without entering Chen Zhaodi's home, but standing in this position, I thought of a physical method: using light. This is also something I figured out at that moment, I no longer think about who wins or loses between me and Shen Cheng, his reasoning is very reasonable, and Pastor Luo can indeed be basically determined to be the murderer.

I just want to fix the remaining unsolved problems.

Hearing my analysis, Shen Cheng's eyes suddenly widened, and he walked up to me and carefully observed Chen Zhaodi's home through the window. Shen Cheng and I both have good eyesight, and our eyes can still see where the gas canister is placed, and the light will definitely be able to travel. At this time, it sounded again, and on the day of the explosion, the city of Chongqing, which had already entered autumn, suddenly changed the sky again.

The temperature rose and the light became stronger, and on that day, because of the heat, I felt very annoyed and had a bad premonition, but what I didn't expect was that the explosion happened. Now that I think about it, the explosion under such conditions may not have been accidental, and the light and temperature of that day were also very likely to be used by the murderer.

"You mean, use optics to make a gas canister explode?" Shen Cheng asked rhetorically, he didn't think of this method either.

I nodded: "Even if Pastor Luo is the murderer, there are still two unresolved questions, one is why we can't tell whether it is one person or two people in the construction site, and the other is how the murderer controlled the time of the explosion." ”

According to Shen Cheng's speculation, Pastor Luo used the banknotes to lure the greedy Luo Danan to the designated location and stoned him to death, which has been explained, but the other two problems have not been solved. I have stressed to the police more than once that it is absolutely no accident that the murderer was able to cause the explosion when Chen Zhaodi was just returning home with his children.

And the method I proposed is theoretically possible.

Shen Cheng lowered his head and thought carefully, and after a long time, he still nodded: "If you apply some chemicals on the trachea, and then use a condenser to remotely transmit the light to the designated location, it can indeed produce the effect of burning and detonating." ”

As soon as Shen Cheng's words fell, the criminal police who searched Pastor Luo's house found a condenser that could focus light from a distance and a bag of chemicals in the drawer. Shen Cheng picked up the packet of powdered chemicals, and after reading the label, he confirmed that this medicine was flammable when exposed to strong light or heat.

This proves that my guess is possible, in order to further verify, after the police detained these two things, Shen Cheng immediately asked people to simulate the test. Because this case is very special and involves the knowledge of physical science, the police need to conduct simulations and experiments many times when solving the case.

Shen Cheng and I came out of Pastor Luo's house, and we called all Pastor Luo's neighbors and Chen Zhaodi's neighbors out, and we had to confirm them. Sure enough, upon questioning, a few people recalled that on the day of the bombing, they did see a bright light in the case of an occasional sweep.

The sun was so big that the sun was so strong that the bright light gathered by the condenser was obliterated in the sunlight, and it was difficult to spot, at most you could only catch a glimpse. On the other hand, the neighbors who live opposite Pastor Luo, that is, Chen Zhaodi, are more likely to notice that flickering light.

After it was confirmed, this fact was also brought down.

After the search, Pastor Lowe's home found a number of other items that could be used as evidence: measurements of the construction floors, calculations of the required thrust, and chemical equations for chemicals when they meet light. Even the residents finally recalled that a few days ago, Pastor Luo went to Chen Zhaodi's house to change the gas pipe of the gas tank for her.

Residents remember that Chen Zhaodi was a little nervous at that time, saying that his family was vented with gas, and Luo Danan was not at home at that time, so she was left alone at home. Then, Pastor Luo took the initiative to help Brother Chen, so Pastor Luo dismantled his own family trachea and replaced it with Brother Chen's house.

Pastor Lowe's gas canister in his home was empty, and since he spent most of his time eating at church, he didn't need to use a gas pipe. That's what Pastor Lowe told everyone at the time.

According to the staff in the church, Pastor Luo didn't like Luo Danan's family very much because they were too greedy, but Pastor Luo was so enthusiastic and took the initiative to ventilate Chen Zhaodi's airpipe, which was very problematic.