The night was quiet, and the small flame at the entrance of the cave shook weakly for a long time, and it seemed that it was about to fall asleep like everyone in the cave.

The old primitives kept vigil by the fire, and from time to time they would put a little firewood into it.

Keeping the fire out is a very important task.

The emergence and use of fire was a great leap in the history of human evolution!

The tribe has also mastered the method of drilling wood for fire, but this drilling wood fire is too troublesome, and it is not as convenient as it is now, sending people to guard the side day and night.

Anyway, these two old primitives are also old, and the rest of the work is basically impossible to do.

With a thick layer of withered grass under his body, Han Cheng's sleeping place was more comfortable than ordinary people, if he had fallen asleep at this time in the past, but tonight, he had no intention of sleeping.

There are generally only two causes of insomnia at night, one is that you sleep too much during the day, and the other is that you have something in your heart.

In later generations, the first cause can basically be ruled out.

As Han Cheng from the next generation, he can also rule out the first reason, because he didn't even close his eyes during the day today.

The reason why he can't sleep at night is because his mind is full of pottery.

He kept recalling every step of the old woman's pottery making in his memory, and then compared the procedures he had performed this time, trying to find out why the gap between the two was so great.

He had been pondering this from day to night and then late at night, but he still didn't have much of a clue.

Although three suspicious places were found, Han Cheng always felt that this was not the main reason for the large amount of pottery to be damaged.

Han Cheng sat up from the 'bed', put on a leather coat, put on animal skin socks, and walked to the outer hole, he had a habit brought from the afterlife, that is, once he couldn't sleep at night, he liked to get up at night.

The old primitive people who kept vigil had long been accustomed to having people go out at night to solve physiological problems.

Every time someone got up, he would turn his head to look, and if it was an adult, he would sit down by the fire and not get up, and if it was a child, he would need to get up and help the child open the heavy stone door.

This is also one of his responsibilities.

When the old primitive man heard the footsteps, he habitually turned his head, and after recognizing that the person who came was the son of God, he hurriedly got up.

Before Han Cheng could speak, he had already skillfully opened the stone door.

There was silence outside, only bright stars embedded in the inky blue sky, which looked exceptionally clear and beautiful, far from being comparable to the night sky that passed through several layers of haze and passed through the neon lights everywhere.

In the night, from time to time, there will be a few distant beast roars that seem to merge with the night, which are still in the dominant position of the flood lords chanting in the night.

The air was cold in the morning in spring, and it was not much better at night, although it had not reached the level of freezing, it still made Han Cheng, who had just come out of the cave, shiver several times in a row, so that even the crystal water column became a little crooked.

Han Cheng was exerting himself, he wanted to quickly drain the water in his body and hurry back to the warm cave.

"Smack!"

Han Cheng didn't go back, nor did he fall into the urine pit because he was urinating too hard, but raised his hand and slapped him heavily on the head.

He didn't go crazy, but suddenly he figured things out, this is what bothered him for the whole day plus the middle of the night!

Damn, such a simple truth was actually ignored by myself!

Han Cheng, who was suddenly enlightened, couldn't wait to slap his head again.

The reason why pottery will crack a lot is simply because of thermal expansion and cold contraction!

When I warmed up and came out of the cave, I couldn't help but shiver when I came into contact with the cold air, and the temperature difference was about ten degrees at most.

When the pottery first came out of the kiln, from extremely hot to extremely cold, the temperature difference between this was more than 100 degrees!

Under such a strong stimulus, it would be strange if it did not crack!

After figuring out the relationship, Han Cheng, who was relieved in his heart, reached out and touched the little finch that was frozen and there was only one head left, and hurriedly ran to the cave.

His heart was gone, and he lay down on the bed and covered it with a thick fur and soon entered the dream......

The river is very lively, because they have witnessed the appearance of a miracle and experienced the good use of clay-fired pottery, and the people of the tribe now have a great enthusiasm for pottery.

Especially after hearing that the Son of God was going to burn pottery again today, everyone was even more active.

After eating early in the morning, they all came to the river.

With the experience of the last time, this time I will operate again, and everything will be much easier.

However, compared to last time, there will be a lot more pottery to be fired this time.

Around the somewhat solid mud pit that was burned by the fire last time, Han Cheng asked people to dig a lot around, and the pit after the excavation reached almost four square meters.

Then it is to lay hay, put mud embryos, fill hay, paste mud, light fires, and seal the holes.

All that's left is to wait.

Senior brother and they went hunting, Han Cheng took a group of little primitives here to guard this simple mud kiln while making mud embryos, and observed through the temperature and small holes on the mud seal to see if the fire inside was extinguished.

Because there are enough clay embryos in the bowl, if they are all successfully fired, it will not be a problem for each person to have one.

Therefore, Han Cheng asked people to reduce the production of bowls and make more clay pots and large vats that are relatively lacking.

Clay pots should also be made.

There were already a lot of mud embryos, but there was no need to hold on to them as before, and after mid-afternoon, Han Cheng led people to clean up by the small river and returned to the cave.

In the past few days, because he has been busy with pottery, he has put down the matter of teaching Mandarin and Chinese characters, and now that the matter of pottery is basically on the right track, Han Cheng naturally wants to continue the course that has been interrupted for a few days.

What is taught today is very simple, that is, the new "pottery" includes its pronunciation and writing, as well as the "pottery bowl", "pottery pot" and "jar" derived from "pottery".

Because everyone has a strong interest in the new 'Tao', so even if the word 'Tao' is more complex and difficult to write, everyone also learns quickly, especially the little master of pottery, Heiwa, who couldn't remember the words before, and now he can quickly write the word 'Tao'......

Around the burning fire, there were three more stones of almost triangular height, and on the stones were placed clay pots that had just been made, and the clay pots contained water.

Under the continuous licking of the flames, the water inside the clay pot had begun to emit white gas.

This relieved the old primitive man who had been worried that the fire would burn the pottery, and then the water would extinguish the fire.

He, like the rest of the people in the cave, didn't know what Miko's strange actions were, but now they were used to it, after all, Miko had made them incomprehensible.

Han Cheng didn't want to do anything, he just wanted to boil hot water and drink.

It's been a few months since I've been here, and he's never touched the rest of the hot water except for the hot urine that came out, and it's really sad to say it.

The water in the clay pot is dry and white, but it doesn't open, which makes Han Cheng a little depressed, and it seems that he has to make the lid immediately, so that it can not only prevent dust from falling into the water, but also play a role in heat preservation.