Daming: Grandpa Emperor, please get up and sit on my throne!

Zhu Yunhuan thought for a moment.

nodded.

I’ve put an asterisk after [Cultural and educational penetration rate].

of course.

That doesn't mean he ignored it.

But this is something that needs to be done slowly and cannot be accomplished overnight.

After all, even in modern society, nine-year compulsory education has only gradually become popular after years of promotion... By 2024, when Zhu Yunhuan fell ill and traveled through time, there were still many people in society who had slipped through the net of nine-year compulsory education.

This is a long-term social work.

Don't consider the issue of distributing newspapers.

"However, the cost of paper must be considered. Modern papermaking technology... cannot do without alkali..."

"Alkali...soda ash, caustic soda."

"Yes, since we want to promote the Industrial Revolution, the four salts, three acids and two bases that are essential for industry are absolutely indispensable."

"I didn't even think of it for a moment before."

Zhu Yunhuan's eyes suddenly lit up.

Immediately write [Four salts, three acids, and two alkalis] after [Cost of paper].

The role of these things is far more than just improving papermaking technology. On a larger scale, when the scale of sweet potato cultivation expands in the future, it will be necessary to consider improving soil fertility. On a smaller scale, they can also be used to make modern soap, a commodity related to people's livelihood and export.

Fortunately, Zhu Yunhuan was somewhat of an excellent student in science in his previous life.

The raw materials for preparing acids and alkalis are not difficult to obtain, the chemical reactions are not complicated, and the conditions are not harsh.

"I'll think about it later and sort out the preparation methods that can be achieved in this era. It turns out that I still need to master math, physics and chemistry. Then I won't be afraid to travel around the world."

Zhu Yunhuan circled [four salts, three acids and two bases].

Remind yourself to focus on this.

"Alas... to raise the standard of the era from the fourteenth century all at once, there are always things that my brain alone cannot take into account. This requires me to check and fill in the gaps in various matters..."

Although there are many things to do, they are messy and complicated.

But Zhu Yunhuan was never a timid person. If an experiment failed, he would change the conditions and do it again and again. If there were too many things to do and it was a mess, he would sort them out one by one from the beginning.

"Next... is printing..."

Zhu Yunhuan had a thoughtful look on his face and muttered to himself.

Just about to continue sorting this out.

Then I heard two familiar voices coming from outside the door, one generous and bright, the other gentle and quiet: "Yunxun."

Zhu Yunhuan raised his head.

Then I saw the eldest sister Princess Jiangdu and the second sister Princess Yilun coming together.

Princess Jiangdu Zhu Chaofang was wearing a light yellow palace dress, with a generous and hearty smile on her bright and beautiful face.

Princess Yilun Zhu Xuening was dressed in a simple and elegant light blue palace dress. Her face was gentle and calm, with a scholarly air, but there was a hint of sharpness in her eyes.

Seeing the two of them, Zhu Yunhuan also smiled and said, "Big sister, second sister."

Seeing these two beautiful and familiar faces.

Do not know why.

Zhu Yunxun suddenly felt a sour feeling rising in his nose.

Since the death of Zhu Yuanzhang, Zhu Yunhuan has been busy stabilizing the balance of the court and consolidating his own position. On the other hand, he is either reviewing memorials, burning glass, or planting sweet potatoes...

There is simply no extra time.

The only occasion he met these two sisters was a quick exchange of glances when they were worshipping Old Zhu in the palace.

Zhu Chaofang and Zhu Xuening also knew that Zhu Yunhuan was in a complicated situation, so they had been holding back and had not come to disturb him. Today, Ma Sanbao went to the East Palace to call them, so they came together.

Count it up.

Today was the first time he met his two sisters since the uprising.

Over the years, Mrs. Lu was wary of him, Zhu Biao ignored him, and others treated him like a waste and sneered at him. The only ones in this world who gave him a little bit of true love and warmth were the two of them.

Even though Zhu Yunhuan had the memories of two lives and had many means and calculations, he was able to check and mediate in the complex court situation.