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

It was only at this time that Zhu Su noticed it.

On the dragon desk.

In addition to the memorials that had not yet been approved, pens, ink, paper, and inkstones, there was also a strange-looking object that he had never seen before. Next to this object was a cup of water and a handful of soil.

Obviously, these are not things that should appear here.

But Zhu Su was on guard and did not speak or ask anything rashly. Instead, he remained calm and waited for Zhu Yunhuan to speak.

Zhu Yunhuan pointed at the water cup and soil on the table and asked, "Fifth Uncle, what do you think this is?"

Zhu Su answered truthfully: "A cup of water and a handful of soil."

"Then Fifth Uncle, take a look at this water and soil. Are they clean?" Zhu Yunheng continued to ask.

"It's clean." Zhu Su nodded in confusion.

However, Zhu Yunhuan did not say anything else. Instead, he dipped some water in the cup and placed it on a small table under the strange thing. Then he leaned over and turned a knob on the thing.

After some rotation and debugging.

Zhu Yunhuan then raised his head and looked at Zhu Su and said, "Fifth Uncle, come and take a look. Is this drop of water still clean?"

"This..." Zhu Su became even more panicked.

It would have been fine if they had just let him come forward, but they also made him stand behind the Dragon Desk—the person sitting behind the Dragon Desk must be the emperor...

Of course, he was immediately interrupted by Zhu Yunhuan: "Come here just as I told you to. Do you want me to write an imperial edict to exonerate you?"

Zhu Su thought to himself, "That's a good feeling..."

However, since Zhu Yunhuan had said so, he certainly didn't dare to respond. He could only calm himself down, bite the bullet, and escape from the desk to Zhu Yunhuan's side.

"Just like me, look here." Zhu Yunhuan took a step to the left.

"Uh, yes..." A layer of cold sweat broke out on Zhu Su's back, but he had no choice but to do as he was told and try to put his eyes close to the top of the cylindrical object like Zhu Yunhuan.

This look.

It immediately captured his attention.

All I could see were long, tiny insects I had never seen before, moving around, and some tiny black dots...

Zhu Su was startled and looked the thing up and down.

The scene I just saw disappeared again. There was only a slight water stain on the bottom of the object. When I put my eyes close to the top of the cylindrical object, I saw the previous scene again... It's really mysterious!

"What's going on?" Zhu Su asked in surprise.

Zhu Yunhuan didn't say anything.

Remove the water stains from under the microscope.

I replaced some clean soil with the place where the water stains were previously placed. I operated the same as before and made some adjustments using the knob.

Then he gave up his position again and said, "Fifth Uncle, please take a look."

Zhu Su didn't understand what was going on. Although he felt nervous, he was also curious. After hesitating for a moment, he leaned forward to take a look again.

This time, the scene in sight turned into a pile of "small gravel" and small insects wriggling among the gravel.

While he was observing, Zhu Yunhuan moved the soil under the objective lens left and right. In Zhu Su's sight, sand and small insects also moved with it.

Zhu Su raised his head.

With eyes wide open in surprise, he bent down to look at the clean soil, then stood up to look at the scene presented by the eyepiece image. Like Zhu Yunhuan, he moved the soil while observing, and repeated this process...

Finally, he came to a conclusion: "What I saw... was this handful of soil?"

Zhu Yunhuan stood beside him, his hands behind his back, looking at him calmly and indifferently. "Exactly! The scene you saw earlier was that drop of water. What do you think?"

Zhu Su swallowed and took a deep breath.

Only then did he exclaim in amazement, "Mysterious! It's truly too mysterious! Besides humans, animals, and plants, there truly are other living beings in this world!"

"Is this what they call 'one flower, one world; one leaf, one Tathagata'?"

Zhu Yunhuan raised his eyebrows: "It's not impossible to understand it this way. In academic terms, this is called the microscopic world."

"This thing you're touching is called a 'microscope.' It works by magnifying things. You'll understand better if you look at it."

After saying that, Zhu Yunhuan took out an ordinary convex lens from his sleeve and threw it to Zhu Su.

Zhu Su caught it immediately.

When he saw the convex lens, he was slightly surprised at first: "This is... glass, such a large piece, crystal clear, without any impurities or color..."

It's not his fault, glass is a rare item in this era.

"Look around at this piece of glass." Zhu Yunhuan reminded nonchalantly.

Thinking that he was now in front of Emperor Zhu Yunhuan, even though Zhu Su was surprised by the pure glass, he could only put all his thoughts aside and do what Zhu Yunhuan said.

Look around with the convex lens in your hand.

The problem was immediately discovered upon seeing it - it was magnified. The four treasures of the study on the dragon desk, his own hands, the patterns on the desk... all were magnified behind this piece of pure and clear colored glass!

"What did you see?" Zhu Yunhuan asked.

"This piece of glass can magnify everything." Zhu Su answered honestly.

"The function of this microscope is similar to that of the glass in your hand. It also magnifies things. However, it has been specially designed and processed by me, and the magnification factor is incomparable to that of the glass in your hand." Zhu Yunhuan explained.

Zhu Su's face flashed with realization. "So, the scene I just saw was a magnification of that drop of water and that handful of soil."

Zhu Yunhuan smiled faintly and nodded: "Then let's talk about microorganisms, epidemic diseases, typhoid fever, and methods to prolong life."