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

Changing the tax system is indeed something that can give him a headache.

In comparison, Zhu Yunhuan's previous tinkering with things like flowers and plants, ceramics, strange skills, and spending money like water... can all be considered harmless minor issues.

There is no other reason. Reform will affect the interests and cakes of too many people.

Even if the actual starting point of this matter was for the Ming Dynasty and the people, it touched the interests of others, and the consequences would be much more serious than his reputations such as "absurd" and "extravagance".

Meanwhile, Xu Miaojin saw Zhu Yunhuan looking troubled. She was secretly delighted at first, then half-joyed and half-sad as she thought to herself, "Yeah... the difference in status between you and me makes it hard to find a solution."

Think of this.

She quietly raised her eyes and looked at Zhu Yunhuan again.

With a glimmer of hope in his heart, he thought to himself, "Even so, is it possible that he is still deceiving me? After two encounters, he has proven to be a well-spoken man, and he is even more adept at discussing scriptures and history. Logically speaking, a businessman who only cares about profit, how could he have such insight?"

Even though she felt that this idea was unlikely, after all, there was no flaw in what the other party had said before, and the other party's expression had always been normal, without any sign of guilt.

But Xu Miaojin didn't know why.

She just felt that Tong Yun was different and should not be a businessman.

But at this moment, as Zhu Yunhuan's arm moved slightly, a crisp sound came from the table: "Ding-dong——"

Xu Miaojin frowned slightly: "What sound?"

Zhu Yunhuan's expression also changed slightly. He immediately reached into his sleeve and took out a transparent object that was thick in the middle and thin at the edges.

Xu Miaojin's eyes flashed, and surprise appeared on her pretty face: "Glass! Completely transparent glass!"

To be precise, this is a convex lens.

When he went out this morning, a lucky prisoner randomly selected from the prison had just ground a 30x lens for him and presented it to Zhu Yunhuan. After he confirmed that there was no problem, he stuffed it into his pocket and took it out.

Only after confirming that the convex lens was not damaged did Zhu Yunhuan breathe a sigh of relief.

After all, the physics knowledge of this era was not up to par, and very few people could understand the principles of refraction, focal length, etc. that he summarized, so the results of this project were not so easy to obtain.

"You...really come from a merchant family?" Xu Miaojin felt that her last glimmer of hope, or rather, her inner intuition, was shattered.

This transparent glass.

Although she had never seen it before, she had heard of it.

Recently, some mysterious people whose identities are unknown have emerged in Yingtian Prefecture and brought out this kind of glass that is said to be crystal clear and completely transparent to sell in the market, causing a rush in the market and a lot of discussion about it in the streets and alleys of Yingtian Prefecture.

Born in the Duke of Wei's Mansion, Xu Miaojin had naturally seen many good things, but she had never seen the completely transparent glass as rumored.

I only knew it when I saw it today.

This thing lives up to its reputation!

However, those who are qualified and capable enough to pay the price to buy such things... are generally only businessmen who are rich and want to save face.

And now that this thing appears in Tong Yun's hands, Tong Yun's identity is self-evident.

but.

When Zhu Yunhuan looked around.

Xu Miaojin said in amazement, "This glass... besides being crystal clear... it actually gets bigger when you put your hand underneath it!"

Zhu Yunhuan smiled faintly, raised his eyebrows and said, "This glass is crystal clear, so besides being for people to appreciate, it also has another wonderful use. Take a look."

After saying that, he handed the convex lens in his hand to Xu Miaojin with great interest, with a hint of thoughtfulness in his eyes.

A hint of curiosity lingered in his heart: "This little girl is smart and knows a lot... The younger sister of Xu Miaoyun, who is known as the "female scholar" in Yingtian Prefecture, I wonder if she can comprehend the theory of physics with her aptitude?"

To develop the overall technology tree, mathematics, physics, chemistry... are all important.

However, in this era, you can find people who are interested in medicine and microscopy, and you can find people who are interested in studying "strange skills and tricks".

However, in fields like mathematics and physics... there are very few people who are good at them, and the threshold is high, making it difficult to introduce concepts.

For example, the concept of light, refraction, calculation method and formula, which is so simple that it cannot be simpler, those who study the teachings of Confucius and Mencius just don’t understand it.

This thing is all about talent and qualifications.

Although Xu Miaojin was disappointed, she had never seen such things as "transparent glass" and "convex lens" before. The little girl was inevitably attracted by her curiosity and immediately took the convex lens given to her by Zhu Yunhuan to examine it.

A pink and pretty little face is full of joy and curiosity.

"To my surprise, there really is such beautiful colored glass. It's pure, without a trace of color or impurities, and it's exquisitely translucent. And it can even magnify things, which is even more magical."

"I don't know how this small piece of glass was done. It's like a magic trick." Xu Miaojin looked left and right with the convex lens in his hand and sighed.

Zhu Yunhuan raised an eyebrow and said, "It's not a magic trick. In fact, everything in the world has its own laws and principles. This piece of glass can magnify things, not because the glass itself is magical, but because I specially ground it into this shape, thick in the middle and thin at the edges."

"Look at this piece, it can only see through things but cannot magnify them." Zhu Yunhuan took out a piece of ordinary glass from his sleeve and explained that he came out today for two reasons: one was to go on a private visit in disguise, and the other was to go to the auction house in person to see the current market situation of colored glaze.

After all, he couldn't rely on glass to make money forever, so he had to keep an eye on its value and strike a balance. So, he also carried some ordinary glass in his sleeves.

Xu Miaojin nodded and said in surprise: "Yes, this one won't work."