The New Year of the fourth year of Jianning (171) was a busy year. As the Zhang family business prospered, more and more guests came to visit. No matter how capable Zhang Wang is, he can't replace Zhang Zhao in terms of identity. Many guests have to be greeted by Zhang Zhao himself. However, this is a happy event, Zhang Zhao is a little tired, and he is also happy.

Zhang Han was busier in the New Year. As the eldest son and grandson of the Zhang family in Wuxian County, he can already receive some unimportant guests. And when Zhang Zhao and Zhang Wang receive important guests, he will also appear together so that he can be introduced to the guests.

In addition, the students in the ethnology came to pay New Year's greetings, and Zhang Han also came to receive them. Due to Zhang Han's high prestige and the reminders of various parents, all the students came to worship the New Year.

In the Great Han Kingdom, etiquette is very particular, and etiquette is still exchanged. With the arrival of this wave of guests, Zhang Han must also take the gifts brought by the guests, visit the guests' homes again, and return the original gifts, or send gifts of similar value, to show that the Zhang family is not greedy for money.

In short, Zhang Han's year is busier than when he was studying in the family. Ruoruo looked very distressed, but she had no way to think about it, so she had to make more delicious food to reward Zhang Han.

However, Zhang Han often needs to accompany others to eat, and most of them are not blessed to enjoy these delicacies. Nine times out of ten, they were all eliminated by Zhang Qing, Zhang Lu and Zhang Heng who came to find Zhang Han. Zhang Heng is Zhang Han's little brother, five years old this year, and his mother is also Zhang Wang.

Later, the three snacks got used to eating, and when it was time to eat, they ran to Zhang Han's room to eat. In desperation, Ruoruo only had to make a few more portions to feed the three little guys.

Sometimes, Zhang Han feels very sorry for Ruoruo. But he was too busy to think about it. In the middle of the year, Zhang Han had a little free time, and Zhang Qing grabbed him again and asked him to tell a story. Zhang Han only felt that his eyes were full of gold stars, where to come up with any story.

Zhang Han really wanted to break off and throw these little things out of the door. But he loves his sister the most, and he also knows that if he dares to do this, Zhang Qing will definitely cry nonstop, and when the time comes, he can't bear it, and he is the unlucky one. After making countless promises, signing a lot of unequal treaties, and contributing tens of thousands of New Year's money, Zhang Qing was sent away.

Generally speaking, the New Year's money is not much, usually between a dozen and dozens of dollars. No matter how much it is, Zhang Han won't accept it, and he can't accept it. However, Zhang Han received more guests, and the New Year's money increased.

Therefore, when Zhang Qinggao happily told him, "I'll come to you tomorrow ......", Zhang Han immediately fell down, which is not incomprehensible.

On this afternoon worth one gold (the official price of the Han Dynasty: 10,000 yuan is equal to a pound of gold), Zhang Han held Ruoruo in his arms, but he didn't do anything, he talked so stupidly for an afternoon, and finally fell asleep in shame.

Before leaving Zhang Wu, Zhang Han found a time to accompany Ruoruo back to his home. In the eyes of her mother-in-law looking at her son-in-law, Zhang Han smiled and played with her. To be honest, Zhang Han is not as comfortable as he appears. I know my own affairs, if my family takes turns to come in and visit in the name of looking for things, Zhang Hanhan will all come down. However, if he is happy, Zhang Han thinks it is worth it. Happiness is sometimes as simple as that.

"What is this?"

The day before Zhang Han was about to leave Zhang Wu, he handed Zhang Wang a piece of paper, saying that it was a New Year's gift for her. Zhang Wang took it and looked at it for a long time, but he didn't understand it.

Actually, that's an abacus. While looking at the account book, Zhang Han suddenly remembered the abacus. Originally, he wanted to make one with his own hands, Liao Biao's filial piety. However, until it was time to leave, he couldn't find the time.

The abacus that Zhang Han said is the kind of one with four beads below and one bead at the top. The beads on the top represent five, one column is equivalent to nine, every ten into one, a total of nine rows, the largest can be counted to nine hundred and ninety-nine million nine hundred and ninety-nine. In general, it is enough, not enough to add two more rows. Zhang Han didn't know the abacus multiplication formula, but just adding and subtracting saved a lot of trouble.

In addition, Zhang Han also proposed a double-entry accounting method for the flow account. Of course, it is also the simplest, one in and one out of the account divided into two columns.

Zhang Han just saw the account book, and he had an idea, thought of these two things, and said that they were New Year's gifts. As a result, Zhang Wang, who received the gift, was very happy with his son's filial piety. However, when Zhang Qing saw this scene, he immediately asked his brother for his gift, and Ruoruo also looked at him secretly......

After the New Year, people who had been slacking off for more than a month, after returning to the family study, found that the distance of 3,000 steps was simply too far away, and it seemed to be out of reach, and they were full of grief.

"Hurry up! I also have the strength to speak, which is very good, and it seems that I can increase the intensity of training a bit......"

Zhang Hancai didn't care about their muttering, he was about to change the flat run to the mountain run, and said by the way, as soon as this word came out, there was immediately a flood of sorrow all over the field - "Don't~".

For the next training, Zhang Han has already thought about it. Running, weight-bearing, push-ups, five-bird play, frog jumping, swimming、...... After years of exercise, Zhang Han has formed a set of his own exercise methods.

But this can only exercise the body and strengthen the body. To become a qualified warrior, one must also learn horseback riding, archery, spears, and short knives, which have been determined to be taught by Wood Fang and Zhang Huan. For specific knowledge of operations, camping, reconnaissance, and marching, you should consult Cen Hui, Wu Tiande (commander of the infantry of the family soldiers) and Zhang Chen (commander of the cavalry of the family soldiers).

Having mastered these, Zhang Han is also ready to study the legendary things such as 'Mo Dao Like a Wall', 'Spear Array Forest', Roman Phalanx, and Mandarin Duck Array. I believe that after having a foundation, the research will achieve considerable practical results after repeated drills.

In this year, Zhang Han introduced Arabic numerals and punctuation marks in ethnology, and seized the time to write textbooks on arithmetic, gewu (physics) and chemistry in preparation for the introduction of new courses in the future.

It is not very difficult to write a textbook, and many of the contents of it have been recorded in the "Memoirs", and now he has to do the main thing to organize to make it more organized. The trouble is that Zhang Han is very busy, and it is rare to have time to calm down, and the writing progress is very slow.

The original arithmetic textbook was mainly "Nine Chapters of Arithmetic", which was a collection of exercises. Through the annotation of the nine chapters, Zhang Han put forward quite a lot of ideas for solving the problem. In other words, Zhang Han wrote an arithmetic textbook under the pretense of annotating the "Nine Chapters". Topics include integers, fractions, decimals, positive and negative numbers, absolute values, functions, equations, and systems of equations, as well as some geometric knowledge.

Gewu and chemistry textbooks are similar, both are more theoretical, but Gewu is more detailed. As for chemistry, Zhang Han only remembers basic things such as oxidation, reduction, distillation, and purification, as well as concepts such as three states, and can't even remember a few of the periodic table, and can only remember how much to write, and slowly supplement. Zhang Han thought about it for a while, and found that physics can still be used, at least it can be used to calculate the range or something, chemistry is just an empty shelf full of flaws, he knows "three acids and two bases", but how to prepare it, only God knows. Forget it, if you don't use it, you can't use it, you should lay the foundation for future generations, anyway, he doesn't expect to be able to create a thermal weapon.

Zhang Han is very busy every day, not only does he have to organize training, teach arithmetic, learn from Cen Hui, manage ethnology, and buy people's hearts, but he also has to design and supervise the construction of the new hall of ethnology, and it is expected that 210 students will be enrolled in the second half of the year; I also often go to Bian Dongzhuang's iron-smelting workshop to participate in the experiments of open-hearth furnaces.

The Book of Heaven in the second year of Jianning (169) and the fourth year of Jianning (171) provided many technologies, among which the agricultural technology was relatively detailed, whether it was planting or animal husbandry, it was basically realized according to the book. Even the troublesome digester, after many repeated attempts, was successful.

Other technologies are not as good as they could be.