Police Detective

"Tian Gen?" Bai Song was walking around the street when he received a call from He Ju. Tian Gen went to the village branch to look for him, and only asked to see Bai Song, but not anyone.

"Well, he said he believed you." He Jue sounded a little helpless, Tian Gen, this kid, is not good at anything.

"Okay, I'll go there." Bai Song nodded. He didn't expect to get any effective facts from Tian Gen, but the cause of this incident was Tian Gen, who was also a good boy.

Tian Gen felt that the house full of police officers seemed more familiar than home. After seeing Bai Song, his eyes lit up.

"Uncle, I, can I come with you?" Tian Gen said.

"Why? Do you also think your sister went to Beijing?" Bai Song reached out and touched Tian Gen's head.

"I also think my mother is abnormal." Tian Geng said with some uncertainty.

"What do you mean?" Bai Song asked, "Did your mother suddenly become rich?"

Everyone has carefully investigated whether Tian's mother sold Tian Fang, including checking whether Tian's mother had received any windfall recently, but they found nothing.

"Are you rich?" Tian Gen was a little confused: "Did my mother also provide you with clues and get paid?"

"That's not true." Bai Song shook his head: "Go on, you feel like there's something wrong with her."

"She doesn't have a good rest every night, and she talks endlessly." Tian Gen looked around, feeling a little embarrassed to say.

Bai Songping retreated from everyone, leaving him and Tian Gen alone in the room.

"What did she say at night? Dedicate yourself or something?" Tian Gen was a little embarrassed.

"This?" Bai Song heard Tian Gen's unclear words and felt like he was given a slap in the face!

With this sentence, Bai Song immediately understood what was going on!

evil!

teach!

! ! !

Bai Song patted his forehead!

It is actually this kind of crime, no wonder all the previous feelings are weird!

If this is the case, everything will be explained!

This thing can destroy people's homes, and they still believe it to be true.

Bai Song shouted and asked two local policemen to come in: "Look at Tian Gen and take good care of him."

After saying that, Bai Song led the team directly to Tian's mother's house.

Bai Song went there with a lot of momentum this time. Not only their people, but also more than a dozen people from He Bureau followed him.

For safety reasons, everyone went into the courtyard. In fact, there is nothing unsafe, but everyone is worried about Bai Song coming in by himself, as if this is some kind of dragon's pond and tiger's den.

Bai Song had been to Tian Gen's home before and clearly remembered that Tian's mother had a place to burn incense at the door of her home. The Tian Gen family was very poor. Except for three tile-roofed houses, there was no shelter from the wind and rain.

I had seen this place before when I came here, but no one took a closer look.

"Police! Don't touch this!" Tian's mother quickly came over to stop Bai Song, because Bai Song had picked up an incense burner.

"What is this?" Bai Song asked.

"It's nothing." Tian's mother stepped back.

Bai Song was a little confused. There was nothing wrong with the incense burner, but the incense ashes inside seemed a little special. He squeezed the incense ashes directly with his hands. It was not incense ashes, but it felt very heavy.

"What is this?" Bai Song asked.

The woman looked at Bai Song in horror, as if Bai Song was about to suffer some bad luck. She said nothing and took two steps back.

"Metallic texture", Wang Huadong also pinched a little, "the specific gravity is very large, it feels almost like iron."

"Xin", Bai Song looked at it carefully: "I understand what's going on, it's a deceptive thing."

"Tin foil, that kind of tin? Isn't it silver? Isn't it this gray metal powder?" Hua Dong was a little confused.

At this moment, Bai Song seemed to understand what was going on.

In the past, in some places, some people would use sodium metal to pretend to be a ghost. For example, if you are performing a performance about ghosts in the water, you would secretly hide small pieces of sodium metal in your sleeves, and then throw them into the basin while "catching ghosts."

Middle school chemistry taught about this chemical reaction, which will cause an explosion. The metallic sodium "swims" quickly on the water surface, generating sodium hydroxide and hydrogen. The explosion can also form white mist.

Such scams have become less and less popular as compulsory education has become more popular and every village has people who have attended high school.

Seeing the metal tin, Bai Song instantly understood what the routine was.

"Metal gray tin," Bai Song said, "This is a process of change of allotropes, which is shocking. Under normal pressure, tin has two allotropes, white tin and gray tin. We usually use All are white tin, which is metallic. However, this metal is very special. When the temperature falls below minus 13.2 degrees, it may transform into powdery gray tin. Gray tin has a diamond-type crystal structure and a covalent structure between atoms. Electrons cannot transfer freely, so they lose their metallicity and become powder. This process is called tin epidemic. The epidemic can also be contagious. After white tin and gray tin come into contact, the white tin will gradually turn into gray tin, and the density will drop by 20%. About %. I think those bad guys may have told this woman that under the influence of some kind of divine power, silver will turn into powder or something.”

After a group of people looked at Bai Song and said this, their faces were all confused, and they all came over to see what it was. Don’t say you’ve seen it, you’ve never heard of it!

"Is there such a thing?" Sun Jie said why he had never learned it before, "It's only minus 13 degrees, why is tinfoil okay in life?"

"There are impurities such as aluminum and zinc in the tin in daily life, and there may also be antimony and bismuth to increase the ductility and lower the critical temperature of tin disease." Bai Song said: "And the conversion rate is not that high. Gray tin can be converted into gray tin below minus 20 degrees. It is safer. In this place, this situation can indeed be achieved outdoors. If the tin block provided is relatively pure, it will turn into powder. "

"So you figured out the trick when you saw this?" Wang Huadong looked at Tian's mother and felt sad.

"Historically, the Eagle Nation scientific expedition team 100 years ago froze to death on the Antarctic ice sheet due to kerosene leakage on their way to Antarctica. The reason was that the iron barrels were welded with tin and turned into dust at that low temperature." Bai Song Said: "The tin epidemic was discovered by Aristotle a few hundred years ago, but the scientific expedition team 100 years ago couldn't remember it, so it is relatively unpopular knowledge. I didn't notice this before I came here. , I thought it was some kind of incense ash.”

"This is so fucking cool." Captain Peng and several other criminal policemen were whispering to the side, and some people started to use their mobile phones to check this thing online.

Tian's mother looked at Bai Song in a state of vague understanding, mixed with fear and uneasiness.

She didn't understand anything else, but what Bai Song said, "Silver will turn into powder under divine power" was true!

How could this policeman know this?

She didn't understand anything else, she only heard this sentence.

She felt a little dizzy.