The year when birch and camelina went south to naturalize the wild people scattered all over the place was destined to be an extraordinary year.

At the end of the fifth year of Gu Guo's travel, that is, after the first month of the fleet, he promulgated the first law in the city, which was engraved on thirty-two pottery tablets in accordance with the values and morals of the people throughout history, and with some foresight that he had brought from later generations.

These clay panels are displayed in the most prominent place in the city, where the stage was located six months ago.

As for the name of the city, Gu Guo felt that there was always a suspicion of touching the ancient civilization of porcelain with uniforms and etiquette, he had already touched it once, and he should always come up with a unique way, so he simply named the city Liang.

The battle of thousands of people defending the city by the Tao River has created the current peace of Liangcheng, and the people in the city should not forget that the Liang character represents the double-edged sword and the wound, as for the wooden character bottom, the three tribes who originally joined the city, their surnames are all related to plants.

A small number of the 3,000-strong city had little connection with the original tribal clan, and the only connection was probably their surname, including the ninety soldiers who had left work and more than a hundred children who had graduated from elementary school.

These people, as well as their relatives who moved into the city with them, had less and less communication with the people outside the city, and only reunited during important times such as the New Year's Festival.

Since the battle half a year ago, the permanent population of the city has exceeded 1,000, and the original small city with a side length of only 200 meters is no longer enough. Coupled with Gu Guo's inclination towards the monogamous policy, people who marry in a single marriage only need to pay two and a half tax grains, resulting in more and more people leaving the collective housing to set up their own doors, and there is almost no space in the city to build new houses for them.

So a new city with a side length of one kilometer started construction on the basis of the old Liang City.

With oxen-drawn ploughshares to open the way ahead, the ditch was dug many times faster than before, and it took the residents five months to complete the excavation of 110,000 cubic meters of earth.

Gu Guo estimated that by the second year of the completion of the city wall, the ditch outside the city, which was seven meters wide and four meters deep, had been filled with water day and night by five waterwheels, becoming a large-scale moat.

In the past half a year of digging the city wall and ditch, Gu Guo has basically soaked in the school to teach the children to learn, and a few children such as Xiaofeng and Gui who are running ahead can already be on their own at this time.

Building the city wall is not a technical job, and after measuring the foundation, they returned to the school to take those newly enrolled elementary school students, and Gu Guo was talking to a group of new junior high school students who had chosen chemistry at this time.

"After science broke new ground, a cloud of chaos was turned into black and white, and the white was divided into seven colors: red, orange, yellow, green, blue, blue, and purple.

"But you're choosing chemistry, not physics."

"What is chemistry?" Looking at the intellectually curious scholars under the podium, Gu Guo continued: "Science creates the world, turns the soul into our ancestors, and hides the mysteries of heaven and earth in all things, and chemistry is one of the ways to explore the mysteries of heaven and earth. ”

At this time, a boy sitting below raised his hand, and Gu Guo motioned for him to stand up.

"Teacher Ji, why doesn't science tell our ancestors the mysteries of heaven and earth directly? Why hide it? After the boy finished answering, he sat down, and a pair of eager eyes around him were projected on Gu Guo's body.

"Five years ago, the people of the Yellow-Haired tribe plundered the tribe of licorice and acacia and killed their people, you all know, right?"

The children under the podium nodded, they had heard the story since they moved to the city.

Gu Guo said again: "The yellow-haired tribe has the ancestors of the yellow-haired tribe, and those people who came from the north last year also have their ancestors. ”

"If science had told the mysteries of heaven and earth to everyone's ancestors, we wouldn't necessarily be able to sit here and teach today."

"Only those descendants who are the most diligent and most learned in their souls can discover the mysteries of heaven and earth, and can make themselves better and stronger, and resist those predatory descendants."

The children nodded as if they didn't understand, and Gu Guo euphemistically expressed the idea that he would be beaten if he fell behind, and then he continued to lecture.

"The world we live in, everything in heaven and earth is made up of atoms." As he spoke, he pointed to the periodic table on the blackboard, and at this time he wanted to thank his junior high school science teacher for letting him put the periodic table on his back.

Except for most of the subgroup elements with atomic weights above 39, the periodic table that he drew on the blackboard can be said to be quite complete.

"At present, the teacher knows that everything in heaven and earth is composed of these 54 kinds of atoms, and of course there are many things that the teacher does not know, such as this large blank space in the middle." As he spoke, Gu Guo pointed to the large piece of sub-clan elements that he hadn't memorized.

"Do you think that there are many types of atoms that make up everything in heaven and earth?" Gu Guo looked at the pair of inquisitive eyes in the audience and asked.

The children nodded, staring at the blackboard and beginning to memorize the names of the atoms.

"These atoms are made up of three parts, protons, neutrons and electrons." As he spoke, he drew a planetary diagram of hydrogen atoms on the blackboard.

"An atom is made up of protons and neutrons, and the electrons that surround it."

"The number of protons inside each substance has been indicated in this table, and the electrons corresponding to them on the outside are also arranged in a regular manner......"

Gu Guo talked about the making of soap to the smelting of bronze, and the colorful classroom opened the door for this group of children to study the mysteries of the Heavenly Dao.

Under the podium, Gu Chi carefully took notes, wrote small simplified Chinese characters with charcoal on the linen cloth specially provided by these students, and waited until he memorized the contents of the linen cloth and then ran to wash and dry the handwriting on the linen cloth and reuse it.

There are a large number of reeds by the Tao River, and Gu Guo can use these fiber-rich plants to make paper in the future to reduce the burden on the acacia side, but he really can't spare the manpower to do anything else now.

The work of expanding the city and cultivating the land was put in the first place, and the birch and camelina that had been naturalized in the south could bring back at least a few thousand people, and how to resettle these thousands of people was a big problem.

Now everyone has thrown themselves into the fields, and the workers who eat the tax grain have all been called together to build houses outside the city, and it is too much to say if there is no food and no shelter.