Brothers Cao Ang and Cao Shuo moved to the main courtyard of the Ding family again according to everyone's wishes.

Although Ms. Liu was reluctant to part with her, she also knew that only in this way could her two sons be better nurtured by her husband and not be limited to this world.

Her son has great ambitions, and she cannot stand in his way.

Cao Ang has already prepared maids and servants around him, so he can no longer move alone. Moreover, moving is actually taking away some of Cao Ang's books, and for other food and clothing expenses, Ding prepared new ones, so that

Cao Ang couldn't stay in Liu's courtyard for a while longer.

So Cao Ang could only watch the pain and reluctance in his biological mother's eyes, unable to even say a word of comfort.

Cao Ang kept telling himself in his heart that one day he would be able to repay Mrs. Liu well, but he knew better that this day was so far away that he didn't know if Mr. Liu could wait until it happened.

.

No matter how depressed he was, Cao Ang was like a happy little sun in Ding's yard. He stayed with Ding every day, either reading and playing chess, chatting to relieve his boredom, or looking after Cao Xi. The relationship between the two continued to grow.

They are no different from ordinary mothers and children.

Cao Ang's life was relatively peaceful, but the day was getting hotter and hotter. Ding stayed in her room for confinement, not to mention how painful it was.

The Cao family has ice, but these days, ice is harvested directly from the river in winter, stored in ice cellars, and used in the summer. Although the Cao family is a rare wealthy family, they use ice

There was a large amount of ice, and Cao Song wanted to curry favor with the Qingliu family and gave generous gifts to each family. Therefore, the stored ice was not enough to last a whole summer, and it could only be used intermittently on weekdays.

But this summer is as hot as a fire, and the ice cubes are used up very quickly. Just after half of the summer, the stored ice is almost used up.

There is an elder in the Cao family and a younger one at the bottom, so it is impossible for Ding to use ice without restraint. On weekdays, she can only restrain herself in the heat. But confinement is a painful thing. In such hot weather, she

He and Cao Xi were so hot that they were covered with prickly heat, and little Cao Xi cried all day long.

Seeing this, Cao Ang decided to make some ice cubes to relieve the heat.

Not only for the Ding family, but also for the birth mother Liu family. After all, even the head of the family, the Ding family, didn't have much ice to use, let alone the Liu family. The newborn Cao Xi couldn't stand it, and Cao Ang's biological sister Cao Xiu was less than one year old.

, also can’t stand it.

For Cao Ang, making ice is not difficult.

Later generations who have a little knowledge of chemistry will know that as long as saltpeter is put into water, the water can condense into ice.

And thanks to his ancestors, who have studied everything, China was able to use saltpeter to make medicine during the Spring and Autumn Period and the Warring States Period, so it was not difficult for Cao Ang to obtain raw materials.

Saltpeter ice can be reused, and potassium nitrate crystals can be obtained by natural evaporation of potassium nitrate dissolved in water, which can be used to continue making ice.

Cao Ang wanted to make ice, so he just started doing it.

Cao Ang did not have these resources a month ago, but now Cao Ang is not short of money or people.

Cao Ang was young and was responsible for guiding the whole process. The servant soaked the saltpeter in water, filtered it, and then boiled or dried the filtrate to obtain relatively pure saltpeter crystals. Then he put the saltpeter into the double-layered iron bucket invented by Cao Ang and poured it into the

The water in the well soon turned into ice.

The servants in charge of the operation were all dumbfounded when they saw the scene of water turning into ice. The eyes they looked at Cao Ang were like looking at gods, full of reverence and fear.

To them, this is a miracle.

Cao Ang gave the prepared ice cubes to Cao Song, Cao Cao and Ding respectively, and in private, he secretly sent a lot of ice cubes to Liu's courtyard.

For Cao Ang, there was no problem in being filial to his biological mother, but he was afraid that Ding would think too much, so he had to do everything in private, without giving others any chance to criticize him.

Cao Song and Cao Cao may know about this kind of thing and will help cover it up.

Ding got ice cubes and could use them as he pleased. The heat was relieved and his days became much lighter. He praised Cao Ang for his clever mind.

Not mentioning the Cao family, the ice made by Cao Ang was delivered to Cao Song. Although the old man was shocked by Cao Ang's intelligence, he quickly thought that this was another opportunity to help Cao Ang become famous.

The old man is worthy of being a tumbler in the officialdom. He has served as the ninth minister for many years. His clever thinking and exquisite planning are unparalleled by Cao Ang.

Cao Song immediately called Cao Ang, and then asked Cao Ang how he made ice.

Cao Ang did not hide this, nor could he hide it. As for why he knew how to make ice at such a young age, Cao Ang also had an explanation.

He told Cao Song that he once put a cup into a basin of cold water and mistakenly dropped saltpeter into the basin. Unexpectedly, the water in the cup became cold. Then he thought that if there was enough saltpeter, he could make ice, so he

I conducted an experiment and unexpectedly succeeded.

Cao Song had no doubts about Cao Ang's statement.

In other words, it doesn't really matter how Cao Ang knew how to make ice. What Cao Song needed was to use this matter to make Cao Ang famous and the Cao family famous.

So after hearing this, Cao Song pondered for a moment, and then said: "It's fine if I know about this. Don't tell others. If someone asks, just say that it's because you feel that your mother is suffering from the heat, and you can't help but face the family at home."

The pond cried sadly, but when I woke up the next day, the pond was frozen."

After hearing this, Cao Ang was a little shocked by Cao Song's magical thinking, but on the surface he still replied calmly: "My grandson knows!"

Seeing that there was no change on Cao Ang's face, Cao Song asked in surprise: "Aren't you curious why the eldest father asked you to say that?"

Cao Ang replied: "My grandson is young and stupid. Although he doesn't understand what my father means, I think he must have his reasons for doing this. Since my grandson can't understand, just do it. One day he will understand."

."

After hearing this, Cao Song couldn't help stroking his hands and said: "God favors me so much, Cao Jugao (named Cao Song), that in my old age, I have such a wise and enlightened grandson. This is true for many people throughout their lives.

I can’t understand it clearly, I didn’t expect that my son would understand it when he is only six years old.”

After Cao Ang left, Cao Song arranged for people to dig a deep ditch around the pond. At night, he poured a large amount of saltpeter into it, poured well water into it, and covered it with a layer of fur to protect it from the sun.

Sure enough, on the second day, there was ice ballast in the pond.

When Cao Song saw this, he ordered a large amount of ice cubes to be poured into the pond.

Cao Song was widely publicized because Cao Ang felt sorry for his mother who was suffering from the heat, so he cried to the pond and moved God. The pond actually froze overnight in summer.

Cao Ang had previously donated blood to save his mother, but now because of his filial piety, the pond froze. In the eyes of everyone, this was a matter of course.

Moreover, this kind of fantasy story is already loved by the common people.
Chapter completed!