"I'll teach you how to do it, and it's going to take your effort." Xia Liandao.

"What do you need us to do?" Zangzi hurriedly asked.

"The Lord God has buried black wealth in this land, it is the blood and bones of the demon of fire, and a little spark can ignite a raging flame and bring you warmth and light.

However, it is buried deep underground and can be very difficult to find. ”

"Black riches?" Zangzi frowned and thought for a moment, and then, as if he had thought of something, he said excitedly, "I seem to have seen it in the past!" ”

"Oh?" Xia Lian's face showed a little interest.

"Come with us!"

Zangzi immediately jumped off the guide's body and led Xia Lian and the others through this underground cave.

This city, which can live in tens of millions of people, is so huge that it would never have been possible to build it without tools without the Fifth Element.

Although these tens of millions of people now have nothing, as long as they are properly commanded, it is inevitable that they will enter the industrial revolution in a short time.

Of course, whether this civilization entered the industrial revolution or not is not necessarily related to Xia Lian's purpose, but the degree of civilization has increased, the fertility rate has naturally risen, and the number of people will increase, and there will be more potential believers and warriors.

While he ultimately wants to develop believers in a wider area, the Eternal Night Star also wants to ensure a sustainable development.

In the short term, if these people in the frozen land become stronger, they will be more evenly matched in the inevitable war with the Promised Land in the future.

The people of Paradise have the best Fifth Element genes, and Xia Lian will not ignore them.

Soon, they went deep underground.

It was uninhabited, not even glowing rice, it was pitch black as ink, and there was a strange smell in the air.

Zangzi took out a string of glowing rice from his body to illuminate it, then walked to the corner and squatted down, picked up a black stone, and held it in front of Xia Lian with both hands.

With anticipation in his eyes, he said, "My lord, is this it?" ”

Xia Lai used AS to scan the structure of the black stone block in front of him.

But before the results could be obtained, Einstein on one side said, "It's bituminous coal, it can't be wrong, and the purity is still very high." ”

"Bituminous coals...."Anya stepped forward with curiosity on her face and took a closer look, "There is also this thing in the Promised Land, and they use it to burn some things.

But isn't this thing poisonous? ”

"That's right." "When we first dug here, we also found that this thing could be lit, and we tried to use it to keep warm, but some people died because of it, so we sealed this place. ”

"No wonder it's poisonous." Sparrowhawk suddenly said, "This is the skeleton of the Fire Demon. ”

Sparrowhawk looked at the coal with jealousy in her eyes, "It's really evil, even if you die, it's still so dangerous." ”

"The main ingredient it produces when it burns is called carbon dioxide." Albert Einstein said, "It's in the air, to be exact."

A human breath also inhales a portion of carbon dioxide, and the oxygen that enters the body is converted into carbon dioxide and discharged into the air. ”

"What?" Sparrowhawk's complexion changed, "We're going to release this poison gas too?" ”

Xia Lian also took over with a smile, "The rest of the gas released by coal is highly toxic.

But carbon dioxide is not a poisonous gas, and the reason why humans will die if they inhale carbon dioxide is because in a certain confined space, it occupies too much space, squeezing out the space for oxygen, making it impossible for people to breathe oxygen.

It's like the gods have drained the oxygen around you. ”

Sparrowhawk recalled the situation, the feeling of near-death, and he never wanted to recall it again in his life.

After a pause, Anya seemed to realize something, and said with some panic, "But if human beings inhale oxygen and spit out carbon dioxide, won't there be less and less oxygen and more carbon dioxide in the future?" ”

"Don't worry." Albert Einstein said, "The world created by God is a perfect circular closed loop, in which all living things form a cycle, which is the circle of life."

Those of you who live in the Promised Land must have seen green plants, right?"

Sparrowhawk and Anya bow to each other.

"Green plants have something called chlorophyll, which when exposed to sunlight, forms photosynthesis and purifies carbon dioxide into oxygen.

In fact, there are very large plants in the sea, including those in this underground city.

However, it does not need to be exposed to the sun to absorb carbon dioxide and convert oxygen. Albert Einstein said.

Mushroom is a heterotrophic saprophyte that does not contain chlorophyll, so it is not photosynthetic under normal circumstances, but this fluorescent rice is a genetically modified species.

Glowing rice is prepared for underground space, otherwise, there are almost no plants in the frozen soil, and there is no need for cold at all, and these humans will all suffocate to death due to high carbon dioxide concentrations.

"So, if you study the remains of these fire demons in the future, you will find that there is something similar to a plant in them." Xia Lian said with a smile.

In her rule, the leaves and rhizomes of plants accumulate on the ground after death to form an extremely thick layer of black humus.

Over a long period of time, it will be buried in the ground due to changes in the earth's crust, isolated from the air for a long time, and under high temperature and pressure, such black combustible sedimentary rocks will be formed.

In this way, even if all the remains of the Fire Demon are used up, there will still be a steady stream of coal. ”

"Is life round?" Sparrowhawk's mood fluctuated.

His face was full of reverence, "What a rigorous and full of wisdom, this huge system of nature should be the greatest masterpiece of the sun god!" ”

"No, her greatest masterpiece is not this world." Xia Lian looked at Sparrowhawk, "It's you." ”

Sparrowhawk was silent, and after a moment, he said in a deep voice, "We are not worthy yet." ”

Xia Lian looked at him speechlessly for a while, and he had realized from the first time he saw him before that this guy had a hand in self-pua.

This kind of little leek is what capitalists like to see the most, and they are too dedicated to brainwashing themselves.

"But... How do we use it?" Zangzi steered the conversation on the right track.

"The reason why you are the greatest masterpiece of God is because the gods have left in your brains the most precious thing, which is called wisdom."

Xia Lian smiled, "Using your wisdom, you can solve a little." ”

Under the puzzled eyes of the people, Einstein spoke.

"Since the smoke emitted by burning it is poisonous, let it be discharged outside, and leave it in the world to purify it, leaving its warmth alone."

"I know!" Anya said excitedly, "Build a chimney!" Paradise does the same. ”

Suddenly, she seemed to realize something, and then said, "But this is underground..."

"We can concentrate the chimneys on a piece close to the surface." Xia Lian said.

"But how can people share the warmth it exudes?" Anya said suspiciously.

Einstein continued.

"Do you know why people sit next to a fire and still feel warm when they are not exposed to the flames?

Because the heat of the flame can be transmitted through the air, and the flame heats the air around you, and the air heats you.

This is called heat transfer. ”

"I see, you mean we're going to build a bunch of stoves somewhere, use chimneys to vent toxic gases to the ground, and then heat up something, and let the heat of those things be transferred to every house in this underground city."

As he spoke, the Sparrowhawk seemed to realize something: "Water?"

"You're smart." Albert Einstein laughed, "Water is a very heat-transferring substance and is easy to circulate."

Through this principle, we can heat water into hot water, which can then flow through pipes into every home.

We place something in the home called a radiator, which is made of the material with the best thermal conductivity, and inside it is a sealed circulation system.

The water we heat is injected into the radiator through the pipes, and when the water flows through the pipes of the radiator, it produces a gas that is heated.

Heating the air and objects below this temperature in the external environment reduces the temperature of the water inside the radiator according to the principle of energy conservation.

But this lowered water, after a turn, the cold water back to the boiler for heating. In this way, repeated heating, cooling, and reheating will make the air and objects in the room increase the temperature to achieve the purpose of heating up the room. ”

Xia Lian also said on one side, "And this, I call it, central heating." ”

"Central heating." Sparrowhawk muttered softly, and began to speculate on the feasibility of this method in her mind.

Then he exclaimed with excitement on his face, "It's possible, maybe it's really possible, it's so smart!" Simple but full of wisdom, it is the most suitable for today's human beings! ”

But then, he seemed to have been splashed with a basin of cold water, and looked at the coals with some loss.

"God has painstakingly put the future of humanity in our hands, and we have never been aware of it.

If this method can be used in the Promised Land, we can even live close to the frozen ground, and there will not be so many problems. ”

After a pause, Sparrowhawk looked at Einstein, "Sir, what do we do?" ”

"I'll provide you with drawings and material templates, and you can use the fifth element to manifest them, and if you have so many people, you should be able to build quickly." Albert Einstein said.

"Yes, without further ado, it's only going to get colder in a few days." Sparrowhawk looked at Zangzi, "Mr. Zangzi, I ask you to mobilize everyone." ”

Zangzi nodded, and then trotted out of here.

"You can go and help too." Xia Liandao.

Sparrowhawk bowed, and then walked out of the mine with Anya.

After the three of them left, only Einstein and Charlen were left in the mine.

Xia Lian turned his head, his smile gradually retracted, and he looked at the mine.

"Professor."

"Huh?" Einstein looked at him with some confusion.

"Coal is formed by plants buried in the ground from ancient times, and there is no other possibility, right?"

Albert Einstein bowed, "At least, according to human cognition." ”

Then, as if he had realized something, he stared at the coal mine around him.

"If that's the case, then there's no reason why there would be these coal mines underneath the frozen ground." Xia Lian muttered softly.

"Maybe it's because of continental drift?" Albert Einstein said, "This continent used to be in the solar zone? ”

After a pause, Einstein vetoed this point to himself, "The seas of the permafrost are frozen, and there can be no continental drift." ”

"Or, there's another possibility." Xia Lian whispered, "In this Eternal Night Zone, there were actually plants in the past. ”

Albert Einstein frowned, "A plant that can survive in such temperatures and nights?" ”

Xia Lian did not speak, but fell into deep thought....