Into Unscientific

inside the laboratory.

After discussing the handover matters.

Xu Yun turned off the penguin colony and began to prepare glue baits for actual combat.

After half an hour or so.

Ding dong——

Along with a vibration, a WeChat notification sounded.

Xu Yun opened the phone call, and the sender was Chang Licheng, the monitor of Class 2 of Yingwu.

He hastily replied "wait a moment", then picked up the small medicine box he had prepared and got off the elevator.

Five minutes later, Xu Yun walked out from the gate of the medical center building.

"God Xu! Here!"

As soon as he went out, a burly boy ran in front of him.

The boy is about 1.85 meters tall, with a very reliable Chinese character face. From his sparse hairline, it can be seen that his grades must not be bad.

This person is Chang Licheng, the current monitor of Applied Physics Class 2. He is also the top three student in the department and a scholarship winner, but there is still a long way to go before he becomes a "God of Learning".

"Li Cheng is here, thank you for your hard work."

Xu Yun greeted the visitor very familiarly, and handed over a bottle of mineral water brought out from the laboratory:

"Come on, drink some water first, and I'll tell you the specific operation steps by the way."

Chang Licheng took the mineral water, gulped down a big gulp, and acted like listening at the same time.

Xu Yun first took out a simple reagent similar to a syringe from the small box, and waved it in front of Chang Licheng:

"What I have in hand is a newly synthesized cockroach medicine. The specific ingredient is called imidacloprid, but you, a physics expert, probably don't understand what it is. In short, it can be used as a special insecticide."

Then he took out another piece of white test paper and squeezed a glue bait the size of a grain of rice on it:

"Here, look, it's enough to squeeze out such a small amount of cockroach medicine every time, and it's a waste to squeeze out too much.

Small amount and multiple times, these two words are the key. "

Chang Licheng nodded, wrote down the dosage, and asked again:

"Understood, but God Xu, where should this thing be squeezed? Or just anywhere?"

Xu Yun shook his head quickly when he heard the words, and said:

"You've got to the key point, Licheng, please recall carefully first, have you ever seen some dry, non-sticky, small, sand-like, and very dense brown spots in the dormitory?"

Chang Licheng was taken aback when he heard the words, and after thinking for a few seconds, his eyes suddenly lit up:

"Hey? God Xu, what you said seems to be true!

At the beginning, I saw a lot of them in the corner of the washing machine in the dormitory, and occasionally on the desk. My roommate even said it was mouse droppings! "

"It's shit, but it's not rat shit, it's cockroach shit."

As Xu Yun spoke, a glimmer of gloom flashed in his eyes again:

"In short, you should first apply the glue bait near the black spot, and you can also apply some on the corner of the wall. This is called targeted killing."

Cockroach feces are not just the excrement of a cockroach.

There is no single cockroach feces, and every time it is found, it presents a random dense distribution.

Translated into human words, it is a pinch of small black dots, which has a very typical "intensive" effect.

This is because the rectal pads of both adults and nymphs of cockroaches can secrete a kind of "aggregation pheromone", which is excreted with cockroach feces.

This pheromone will send a message to the surrounding cockroaches, "people are stupid, eat a lot, be safe, come quickly", and it will also become food for the little cockroaches.

Cockroach feces generally appear in the shade of bathrooms, kitchens and balconies, which is also an excellent place to put glue bait.

After introducing how to use the glue bait, what Xu Yun left is some details:

"Licheng, you go back and tell your classmates that when putting in the bait, try to cover the entire floor as completely as possible.

Imidacloprid is a kind of insecticide specially targeting insects, and it is harmless to mammals. Unless twenty sticks of glue baits are swallowed in one go, the human body will not have any problems.

In addition, I also added a bittering agent in it, even if a stray cat or dog came in and ate it by mistake, it would not be poisoned. "

Chang Licheng wrote down Xu Yun's explanation one by one, then said goodbye to Xu Yun, and returned to the dormitory with the small box.

The dormitory for Applied Physics majors is located in Building 14 of the East District, next to the Pomegranate Garden, a sacred place for donation, and very close to Susong Road, so the frequency of cockroaches is higher than other dormitory buildings.

Before leaving the dormitory, Chang Licheng specially asked several dormitory heads that at least one person in each dormitory should wait for the follow-up notice.

As an authentic Liaodong man, Chang Licheng is just as forthright as most men in Northeast China. His character has been unanimously praised by everyone in the class in the past year and a half, and his popularity is excellent.

Not to mention that there are so many followers who raise their arms and call out, at least everyone will pay more attention to what they say.

With the blessing of his personality, when he returned to the fourth floor where Class 2 was located, most of the dormitories had been prepared according to his requirements.

This moment.

Even Ye Guohong, who had gone out with his girlfriend earlier, rushed back and waited for him at the entrance of the dormitory corridor.

Seeing Chang Licheng appear, Ye Guohong took the initiative to greet him, his eyes paused on the small white suitcase in his hand:

"Hey, old Chang, are you planning to change your career to become a technician? Picking ears or feet, what about slippers and hand cards?"

"roll roll roll!"

Chang Licheng first made an international friendly gesture "convex" to his friends, then he looked serious and asked:

"Lao Ye, are there people in every dormitory?"

Seeing that Chang Licheng was talking about serious business, Ye Guohong stopped joking, and pointed to a closed dormitory seven or eight meters away:

"He Tao and his dormitory have four people working part-time. Besides, there is at least one person in each dormitory."

Chang Licheng nodded slightly. It's the weekend now, and it's rare to have only one dormitory with no one left:

"If it's a dormitory, don't worry about it for now, Lao Ye, you can organize it and call the head of the dormitory or the dormitory representative to me, and I will explain the details to everyone."

Ye Guohong can also be regarded as Chang Licheng's old partner. Hearing this, he nodded heavily:

"Okay, I'll go find them now."

five minutes later.

Ye Guohong brought several dormitory heads to Chang Licheng's dormitory, but there was no one in Chang Licheng's seat:

"Old Chang, where are you?"

Soon, Chang Licheng's voice came from the balcony outside the dormitory:

"Here we are, Lao Ye, bring everyone over here to have a look!"

Ye Guohong exchanged glances with several dormitory heads, and came to the entrance of the balcony one after another.

At this time, Chang Licheng was squatting on the ground in an Asian squatting position, squinting, looking at the entrance of the bathroom thoughtfully.

When Ye Guohong saw this, a question mark appeared on his face:

"Old Chang, what are you doing here, planning to learn from Lao Ba? Not at the same time, but in the same toilet?"

"piss off!"

Chang Licheng waved at him angrily:

"I'm looking at cockroach droppings!"

Ye Guohong couldn't help but look weirder at him:

"Cockroach feces? Your taste is more important than Lao Ba's."

Chang Licheng gave him a 'bump' back with both hands this time, and then called everyone to come forward, and relayed what Xu Yun told him.

ten minutes later.

All details have been handed over.

Each head of the dormitory was assigned a tube of glue bait syringes, and went back to the dormitory to set up the glue bait.

Chang Licheng took out two bigger and thicker syringes, and handed one of them to Ye Guohong:

"Lao Ye, hold this thing well, let's wipe the track of the aisle, and try to get everything done within half an hour.

Although this thing may not be useful, Assistant Professor Xu has helped us a lot. Let's take care of all the people in advance, and leave the rest to fate! "

Ye Guohong nodded, took the syringe, and followed Chang Licheng out to set the bait.

Forty minutes passed.

Inside and outside the dormitory on the entire floor, all hidden corners with traces of cockroaches were filled with glue baits.

All is ready except for the opportunity.