As the revival of Reiki approaches its sixth year, the level of technological productivity of mankind has been greatly reduced. In what was once known as the "factory of the world", the vast majority of cities have been reduced to the point where they cannot even build an internal combustion engine.

In fact, these cities have also made plans for resumption of production as Binhai is now, because modern manufacturing does have a lot to offer.

For example, the heavy-duty truck, even the most conservative practitioner has to admit that it is really useful. Cultivators should be elegant, and no one wants to carry dozens of tons of supplies when they go out.

But in this troubled world, the car is broken and one is missing. Five years on, and in many places there are only a few dozen usable trucks left in the city.

Everybody wants to get a car production line, and this thing definitely sells well. But the key problem is that clearing demons in the wild is not a one-time thing.

One of the characteristics of demons that is a headache for humans is that they cannot be killed. Even if the demons in an area are completely swept away, it won't be long before new monsters will be born naturally.

This phenomenon is only significantly reduced (not entirely absent) in places where there are large concentrations of humans, which is why the vast majority of humans retreat to cities.

Even if a suburban factory is cleared, in a few days, new monsters will be born naturally, and the workers will disperse in a hurry.

After many attempts, humans abandoned large-scale operations outside the city and only temporarily went out of the city to harvest when the crops were ripe. You can't stay too long, and the youkai that roam the wild will follow the breath of humans to find them.

And Yu Xiaoyue was able to make up her mind to clean up a large area of territory between Binhai and Pingchun this time, thanks to the latest technology provided by Professor Xu Yongzhi:

Reiki vortex early warning.

The device is a modification of the original Reiki detection radar and has a range of about 20 kilometers in diameter. It works amazingly, being able to predict where youkai will be born twelve hours in advance.

This is something that Sun Da can't do. He has a long ancient heritage, and he can guess what type of demons will be born in a certain place based on the terrain and the flow of spiritual veins. But he couldn't predict exactly when the demon would be born.

Despite their confidence in Professor Xu's skills, the people who participated in the combat meeting were still curious. Taking this opportunity, Professor Xu took everyone to the laboratory to visit and explain. There, You Qiao is putting the finishing touches on the eddy current warning.

Once the operation begins, the new instrument will be deployed in the center of the industrial zone as the troops depart. The power supply is still a set of wireless transmission arrays, and a squadron of city guards is responsible for keeping it running.

Xu Yongzhi opened the projection screen, and hundreds of fluid models appeared on it. Professor Xu pushed his glasses and explained:

"We have a Reiki fluid model research group. ”

As he said this, the three ladies in white coats and glasses standing on the side bowed slightly to everyone.

"The team's original job was to use the Reiki detection radar to monitor patterns of Reiki movement and plot numerical curves. Please pay attention to the ......"

The projection screen switches to a screen, and a three-dimensional line map of the terrain around the coastal area appears, and the entire line map is green. But in it, there are countless tiny white lines running through.

These white lines are not disorganized, but follow a pattern that looks like hundreds of parallel streams and rivers. Sun Xiang raised his eyebrows unexpectedly, this picture almost completely coincided with the trend of Binhai's spiritual veins.

"These white lines are the trajectory of the highly concentrated spiritual airflow. Our research team discovered a phenomenon during long-term monitoring. Please note here. ”

Xu Yongzhi enlarged a small dot in the picture, and at the junction of the two rivers of spiritual energy, there was a small whirlpool.

"Based on the inference of the available observational data, the Reiki fluid absolutely does not conform to any known mechanical principle, and we cannot understand it. But the shape of this vortex, according to Chief Xu Yishan's calculations, almost completely conforms to the eddy current formula of classical mechanics. ”

"Our research team recorded the values of all the eddy currents and tried to extrapolate the properties of the Reiki fluid using fluid dynamics. They didn't succeed, but they made an amazing discovery. ”

Seeing that everyone's interest was aroused, Professor Xu smiled and pushed one of the glasses girls in the research group up. It's their glory.

Suddenly faced with so many big people, the shy scientist stammered when he spoke. City Lord Yu cast an encouraging glance at her. Maybe because she is also a woman, she calmed down a little and took over the task of explaining.

"In addition to monitoring the flow of Reiki, our research team will also provide equipment maintenance services for the city defense forces. Once, a soldier complained to us during maintenance that a nest of mountain spirits was suddenly born on the road in Cangwu Mountain, and they lost a car. My mind was moved, and the location that the soldier had described happened to be the location where a new vortex had appeared that I had recorded the day before.

I suddenly realized that this inexplicable aura vortex may have some mysterious connection with the birth of youkai. Our group retrieved the records of the city defense army and found that the recent newborn demons matched the location of the vortex we recorded.

After the application, we conducted several tests with the City Defense Force. It was finally determined that this aura vortex was the harbinger of the birth of the demon.

And the time of this aura is exactly twelve hours!"

Whoa, whoa, whoa!

Sun Xiang took the lead, and everyone applauded. Glasses Niang received the recognition of so many people, bowed and thanked, jumped off the stage and hugged the other two members of the group excitedly.

This discovery is so important!

The biggest reason why humans are trapped in the city is that they can't effectively deal with the monsters that are randomly born in the wild. For example, a factory was fine yesterday, but today a zombie may emerge. Although the cultivator can slash these miscellaneous pieces, these monsters may have caused heavy casualties before the cultivator arrived.

The only way to deal with it before was to spill out a large number of cultivators as Tu Peng did, constantly patrolling the territory, and finding that the demons were eliminated on the spot. But most cities can't have as many cultivators as Songhe.

Now, with eddy current detection, it is possible to give an early warning up to 12 hours in advance. In that way, whether the coastal cultivators are sent or the city defense army, they can be calmly arranged. Think about a resentful soul that has just been born, and before he can open his eyes and scare a few people, he is beaten by the divine light sword surrounded in all directions, this picture is too beautiful to think.

"You're doing a great job. Yu Xiaoyue walked over and took the glasses girl's hand, "What reward do you need?" ”

No amount of reward can be overstated, because of this discovery, human beings have the confidence to get out of the city.

"Thank you, City Lord, but we don't need a reward. The glasses lady looked at her companions, and finally replied to Yu Xiaoyue sincerely, "You have sheltered us useless researchers in the troubled times, and provided us with a happy land to live. Lord of the City, it is already our greatest happiness to be able to help you. ”

Speaking of this, the glasses lady had tears in her eyes.

Even in the most difficult days of Binhai, Yu Xiaoyue did not give up on these scientific research workers, and did not let them live on the streets to fend for themselves.

Her persistence and protection finally bloomed the first flower today.