Doomsday: Humanity shrinks 100 times

Chapter 48 Relative Stillness (Seeking Follow-up Reading)

There were more and more people at the tree hole, especially two more female members, and the issue of using the toilet became a key issue again.

Due to Xu Qi's sudden incident, the construction of the indoor bathroom had to be stopped and now has to resume.

Fortunately, the most difficult part has been completed before. The basic infrastructure is in place, and all that remains is to build the facilities.

The lowest point of construction is naturally in the girls' dormitory.

The location of the bathroom had been determined before, and it was placed in the corner next to the window. This way, the work workload was small, there was no need to dig through the tree trunk, and ventilation was also easy.

The sewage pipe was also opened in advance.

The main focus of bathroom design is on the water inlet, which should be designed in a U shape so that odors can be effectively isolated through water sealing.

Knowing the principle, it is not difficult to implement. As long as the shape is made, the key is to ensure the sealing.

Lu Yuning worked hard for a while, digging and patching, and finally got it done.

The others couldn't help and could only watch him work curiously.

Once it's done, it's time to test it.

At this time, Zou Yunxin was standing next to the bathroom with a basin of water in his hand, and the others were also standing at the sewage outlet under the tree.

"Get ready! Pour the water!" Zou Yun shouted to inform the people under the tree, then poured the basin of water in his hand into the water inlet.

It is said to be a basin, but in fact it is just a few drops when viewed from a normal perspective.

In fact, several people had discussed two issues before.

One is the problem of water tension.

Simply put, due to insufficient water volume and insufficient water gravity, the water in the drain pipe may have a tension greater than its own gravity, resulting in the water being unable to slide down.

This is not a simple question, because in addition to surface tension and pipe diameter, it is also affected by many other factors, such as water purity, temperature, pipe material and the smoothness of the inner wall, etc. It is difficult to give an accurate critical diameter value.

It is better to put it into practice than to calculate it silently. After all, Lu Yuning's special ability is free to use.

After several people conducted experiments, they found that there was no major problem. The most important point was to ensure that the diameter of the drainage pipe was greater than a certain value.

Under this premise, it is enough to ensure sufficient water consumption.

The second problem is that there is a concern that the dirt cannot be taken away due to insufficient water.

But Zhang Qian gave an answer.

The main thing is that the U-shaped tube can not only form a water seal to isolate odors.

Another important function is to form a communicating vessel.

When the water inside accumulates to a certain level, it will overflow and the sewage will be pumped out through siphoning. During this pumping process, the water flow is relatively turbulent.

Of course, the premise is to ensure that the gravity of the water is greater than the tension.

In this case, there is no need to worry about blockage, which is also the working principle of general siphon toilets.

After these two problems were solved, everyone began the formal drainage experiment.

As the water was poured into the water inlet, the sound of rushing water and intake of air soon appeared.

After a while, water flowed out from the sewage outlet, and everyone standing at the sewage outlet looked delighted.

With this experience, the bathroom in the men's dormitory was quickly built.

After two days of hard work, the first indoor facility has been officially completed, and the quality of life has been further improved.

However, this brings up a new problem, which is that the amount of water used in the bathroom is astonishing. A lot of water is needed for each use of the toilet.

Fortunately, they had stored a lot of water from the previous heavy rain, which was enough for the time being.

However, Lu Yuning has always had some ideas about this issue in his mind, which is the water system that he mentioned at the beginning on the river bank.

They now have a great demand for water, the most basic of which is drinking water, and domestic water, such as for washing face and hands, etc.

Now that there is an indoor bathroom, water consumption has increased significantly.

Water supply is one issue, and another is convenience.

Since their water storage area is under the tree trunk, they have to run back and forth every time they flush the toilet, or they have to store some water above, which takes up a lot of space.

Washing and other things also need to be done under the tree trunk. It is okay now, but it will obviously not be possible in winter.

Now that we have a sewage system, it seems we need to consider the construction of a water system. If we really want to do it, the amount of work will be considerable. We may need to build a large water storage tank at the top of the tree trunk and then develop the steam water pump that we thought of before. Only then can we completely solve the water problem.

……

However, the idea of a water system can only be postponed for the time being. The top priority right now is food reserves, and everything else can be accommodated.

The first thought at the moment is definitely to store more walnuts, but eating them all the time is definitely not a good idea, as it may lead to malnutrition.

The human body needs a lot of trace elements, and walnuts alone are obviously not enough, and they are high in fat.

So in addition to walnuts, they also need to consider other food sources, such as wild vegetables.

After thinking about it, they decided to explore the area to see if they could find some edible wild plants.

The exploration location is still the riverside, one reason being that it is more familiar, and the other reason being that the soil there is moist and some special plants may grow there.

But we won’t go to the previous shelter because it’s too far away.

Instead, explore the riverside area near the fork in the road.

Lu Yuning had previously discovered a hidden path nearby that led down to the river.

So the final exploration destination was determined, but before that, Lu Yuning decided to upgrade his equipment.

……

When Lu Yuning was thinking about what to do with the equipment, Wu Xiao found him first.

"Yu Ning, I have a new discovery," Wu Xiao said mysteriously.

"Hmm?" Lu Yuning was still thinking about the equipment, and responded with a casual reply.

"Didn't you encounter that spider last time?" Wu Xiao didn't care whether Lu Yuning listened or not, and started telling him excitedly.

"Spider?!" Lu Yuning shuddered subconsciously when he heard the word spider, and then he withdrew his attention.

"Yes, Spider, when you were attacked by him, I sent the shield to you. Later, I thought about it and suddenly realized something. My ability seems to be different from what we thought before."

"Hmm." Lu Yuning became interested.

"Do you still remember the rules for using superpowers that we summarized earlier?"

Lu Yuning nodded.

The two of them had discussed some issues regarding Wu Xiao's previous use of his supernatural powers and finally summarized four key points.

First, it cannot be effective on living organisms. The same is true for Lu Yuning. They tried to use the supernatural power on the spider corpse, but there was no reaction. The reason is unknown.

Secondly, the original complete structure of the object cannot be destroyed. For example, if Wu Xiao is holding a shield in someone else's hand, he cannot put the shield into the space. The river water is also not allowed, because the water in the river is considered a whole, but the container filled with water can be put into the space together.

The third is naturally the volume limitation.

The fourth point is that it cannot be used for non-stationary objects.

Lu Yuning repeated these four points again.

"Yes, these four, but later I found out that when I sent the shield to you, the shield was not stationary." Wu Xiao showed an expression that seemed to indicate that something was wrong.

"Hmm?" Lu Yuning still didn't understand.

"You probably didn't see it at the time, but when I put the shield into space, I was running!"

Lu Yuning was stunned for a moment, and then his expression gradually turned into surprise.

"Relative stillness!"

"Ah, yes, yes, that's what I wanted to say. I think we didn't figure out the fourth point before."

"In other words, as long as the object is stationary relative to you, your ability will still work?"

"Yes, that's what I mean. Will this be useful?" Wu Xiao scratched his head.

Lu Yuning frowned slightly, pondered for a long time, then his eyes widened, and an idea suddenly popped into his mind.

　Thank you all for your recommendations. I am very grateful to see some familiar IDs.

(End of this chapter)