Zheng Sheng was looking forward to the dream coming again.

Early the next morning, Zheng Sheng stretched comfortably and got up. He was stunned for a moment, then smiled wryly.

He slept very well this night, he didn't dream, naturally there was no balance appearing, naturally ...... I also want to drink a bowl full of throat-pulling soy milk with okara.

Zheng Sheng looked at the four large bowls of soy milk on the table, very helpless.

What's going on? Why didn't the Balance Dream appear? Zheng Sheng felt the need to recall the time when the balance appeared.

He remembered that about a few months ago, he dreamed that he had returned to a twenty-first-century middle school in an experimental class, and he dreamed of the scales for the first time.

Then the next day, he dreamed of the scales again. There are no other dreams, only a lonely scale. Zheng Sheng still remembers that after waking up the next day, he was stunned for a long time, just to think about how he could have such a strange dream?

Then, after some time, he dreamed of that strange balance for several days in a row. Then after a while, he dreamed again. Zheng Sheng was suspicious for a while, and he suspected that it was the balance that brought him into this world. The appearance of the scales means that something strange may happen.

But, nothing happened. Zheng Sheng is also used to the scales that appear in his dreams every once in a while.

Until, the night before yesterday. The scales came as scheduled.

He has been thinking hard about finding a solution to the okara in soy milk all this time. So he wanted to put a bowl of soy milk on the tray of the scale. As a result, a bowl of soy milk actually appeared on the tray on the right side of the scale.

Zheng Sheng was stunned.

At this moment, an even more shocking scene occurred, and a large word suddenly appeared above the other tray of the scale: Request.

Beg? What do you mean? Request? Request? Demand? Yes, yes. Zheng Sheng really wanted a bowl of soy milk milled by a delicate soy milk machine.

Then, the big words disappeared, and a bowl full of soy milk appeared on the tray.

Then the pallet starts to tilt, the left side sinks, and the right side floats up. Indicates that the masses on both sides of the balance are not equal.

Then, the bowl of soy milk on the left tray began to slowly decrease, and the balance slowly returned to balance.

Until the soy milk on the left tray is half on the right, the balance is perfectly balanced.

This was the dream of that day.

Zheng Sheng summed up the rules that he already knew now.

First, the balance does not appear every day, but only every few days or when conditions are met. And the number of occurrences is a definite three days. Zheng Sheng will never be mistaken. Every once in a while, there would always be three days when he would dream of the scales.

Second, regarding the transaction of soy milk, a bowl of soy milk in reality can be exchanged for half a bowl of "residue-free" soy milk.

Zheng Sheng recalled what was different when the balance appeared. But he thought about it for a long time, but he still didn't think of any results.

Zheng Quan ran in again: "Shizi, are you awake?" Today's bean soup ...... There's a lot of soy milk! ”

He picked up the bowl, drank it all, and frowned: "Shizi, is this soy milk different from yesterday's?" How does it feel different? ”

"Do you feel something different?"

Zheng Quan shook his head.

"Feel it!"

Qing'er was not interested in the reason why Zheng Sheng did not use the secret method to remove the bean dregs.

Zheng Sheng's life has returned to peace. The morning workout went well.

But Zheng Sheng's teaching career was hit hard.

Zheng Cheng and Li Anjian struggled to study. I have forgotten more than half of what I taught yesterday today, so I can only start again.

Zheng Sheng thinks that it is better to find some people with learning talent to learn in the future. Like Li Anjian and Zheng Quan, teach them some simple things. can be literate, can read things, and can write simple articles; In mathematics, simple calculations, plus simple physical and chemical knowledge. It is remarkable that they have a level of knowledge that is almost equivalent to that of the fifth and sixth grades, or even the first and second years of junior high school.

Assign the task of copying characters to Li Anjian and Zheng Quan. Zheng Sheng sat aside and began to do one thing in earnest: he decided to write down some of the things he still remembered, and in terms of time, he hadn't learned those things that gave him a headache for three years.

Zheng Sheng's memory is okay, and he still remembers about half of the high school mathematics, physics and chemistry formulas.

After writing out a magnetic field formula in physics, Zheng Sheng stared at it for a long time and realized that the formula was completely useless.

Zheng Sheng thought of a problem, for example, chemistry, the most basic nature of chemistry is the periodic table, but now in this world, the acceptable elements are iron, copper, gold, silver and other metals, if Zheng Sheng tells others that a water is composed of one hydrogen and two oxygen, the air we breathe is composed of oxygen, nitrogen, nitrogen dioxide...... Zheng Sheng imagined that scene, it was like playing the piano to the cow.

Now I am afraid that no one can accept such knowledge, because there is no cognitive basis.

Li Anjian and Zheng Cheng can accept the operation of literacy, addition and subtraction. It's because they've seen it and know what it's for.

At the beginning, in order to let Zheng Quan, who refused to do math problems, accept addition and subtraction, Zheng Sheng asked him a question: In the kitchen, there are a total of six eggs, today, we ate four, and Bu Bo put seven more eggs, how many eggs are there in the kitchen?

Zheng Quan blushed, "Shizi, I'll count it, and I'll know." ”

Zheng Sheng slapped him, "An Jian, have you calculated it?" ”

Li Anjian put down his pen, "Shizi, it's been calculated, it's nine." Zheng was convinced.

Therefore, science without practical application is untenable. Zheng Sheng thought.

Zheng Sheng slowed down the pace of compiling textbooks, and after copying down the things he remembered, he put them all away, and Zheng Sheng hoped to use them one day.

Zheng Sheng began to be distressed, and he found that he could no longer teach them, because Zheng Sheng couldn't recognize some traditional Chinese characters, so he could only guess. So, Zheng Sheng found that he also needed a teacher.

Time passed, and Zheng Sheng waited for the balance to appear again.

It has been nearly a month since the last time the balance appeared, but Zheng Sheng eats well and sleeps soundly every day, and rarely even dreams.

But this day, when Zheng Sheng saw that level again in his dream, Zheng Sheng breathed a sigh of relief.

The next day, Zheng Sheng drank modern soy milk without residue. He asked Zheng Quan, "What day is today?" ”

Zheng was stunned, what day? "Today is April Day."

Zheng Sheng was confused, "Wushen Day? He seems to have forgotten the fear of being dominated by the sexagenary branches. Back in ancient times, Zheng Sheng knew that it was not only the year that could be expressed by the dry branch method, but also the year, month, day, and hour.

"Today is the day of the moon." Qing'er said on the side, "Zheng Quan, you forgot, the prince is very serious, and told him that he is a dry branch, and he must study that day is the first day of the month." ”

"Moon Lookout Day? Fifteen or sixteen? Zheng Sheng's eyes lit up, could it be that the balance appeared in the middle of the month?

"Son, this New Moon Day is one day less, fifteen days." Qing'er said.

"It was the night of the fourteenth, fifteenth, and sixteenth, which was about exactly the three days when the moon was at its fullest." Zheng Sheng muttered to himself.

Zheng Quan and Qing'er glanced at each other, what nonsense was the prince talking about?

Zheng Sheng summed up the new law of the scale: it appears in the middle of the month every month, and it takes three days.

Then, Zheng Sheng began to wonder what new things he could trade.

Zheng Sheng set his eyes on the paper in front of him.

Speaking of the invention of paper, everyone knows that paper was invented by Mr. Cai Lun of the Eastern Han Dynasty, in fact, he improved the process so that paper can be widely used in writing. Since then, Chinese society has bid farewell to the era of bamboo slips and silk writing.

When he arrived in the Jin Dynasty, Zheng Sheng learned that the books were full of lies.