Vincent blinked his eyes and said thoughtfully, "Iron-hulled ship? Is that possible?"

Zhu Youxiao smiled. Although there was no point in building an iron-hulled ship without sufficient power, the idea was there. If it continued in this way, more people would continue to research it.

As for the steam engine, Zhu Youxiao felt that without more than ten or twenty years of dedicated research and testing, it would be impossible to create a practical one. Therefore, there was no rush, and it was not the most important thing.

Without a peaceful and stable social environment, and without the conditions for peaceful study and scientific advancement, Zhu Youxiao would not have much energy for at least the next year or two. He could only offer brief explanations and guidance, hoping that these people would have sufficient understanding and practical skills.

Then another student asked a question, and Zhu Youxiao thought for a moment before answering it. Again, it was about linking theory with practice, but the specifics still needed to be verified by the student himself.

None of the questions stumped the emperor. It was just junior high school physics, but that wasn't all. Besides a vague explanation of gravity, Zhu Youxiao answered every question like a scholar.

The way people looked at the emperor became more and more different. At first, they thought that Master Shen had a good master, or was lucky enough to have obtained the knowledge that the senior masters had spent their entire lives researching.

But now, everyone knows that Mr. Shen's understanding of physical chemistry is far superior to theirs. Although the age difference is not big, how can he reach this level without hard work?

Maybe - the books were all compiled by Brother Shen, right?

Wang Jizhong looked at "Shen Lang" thoughtfully, and suddenly this thought popped up in his mind.

It's no wonder that he had wild thoughts. As far as those two books were concerned, if he didn't understand them thoroughly, he would never be able to speak fluently and hit the nail on the head in every sentence.

In fact, these two books do not represent Zhu Youxiao's true level. He knew that he could have learned something more profound, but due to limited time and energy, he only compiled a relatively superficial knowledge.

"Brother Shen, Brother Shen." Xu Fuyuan appeared at the door of the hall and waved enthusiastically.

Zhu Youxiao smiled and waved, then noticed Zhang Yitai following behind Xu Fuyuan. Zhang Yitai held up a lens and observed Xu Fuyuan's neck, his eyes flashing fiercely, which scared Zhu Youxiao.

This guy is really abnormal. He looks like he wants to bite someone.

Xu Fuyuan looked back at Zhang Yita and was also startled. He quickly reached out to open Zhang Yita's lens, pulled his sleeve and walked towards Zhu Youxiao.

"Brother Zhang has made a great discovery, using a lens he ground himself." Xu Fuyuan exclaimed as they walked. "The water is full of little bugs, all kinds of them, and they're all alive!"

Wang Jizhong had just picked up the tea when he heard this and hurriedly looked into the bowl with his eyes wide open.

Similar to Wang Jizhong's expression, many people were now shocked. Those who had tea in their hands or on the table hurriedly lowered their heads to check.

Zhu Youxiao smiled slightly, picked up the tea, took a sip calmly, and then gestured to Xu Fuyuan and Zhang Yita to sit down.

"Brother Shen..." Wang Jizhong saw that Zhu Youxiao didn't take it seriously and asked doubtfully, "Brother Xu, are you kidding us?"

"Why don't you believe it?" Xu Fuyuan looked at Wang Jizhong, then at Shen Lang, who showed no sign of surprise, and reached out to pull Zhang Yitai again. "Come, come, let them all see."

Zhu Youxiao chuckled, waved his hand, and said, "There are many creatures in the water that are invisible to the naked eye. But calling them insects isn't quite right. I call them microorganisms."

Zhang Yita's eyes suddenly widened as he stared at Zhu Youxiao. His previously somewhat clueless expression turned into surprise. He asked, "Brother Shen, did you know this a long time ago? Tell me quickly, are those insects... no, microorganisms harmful to humans? What would happen if someone drank it?"

Zhu Youxiao lifted the teacup and said, "Brother Zhang, have you ever observed this tea or boiling water?"

Zhang Yita shook his head and said, "What's the difference?"

"Raw water contains microorganisms, and when the water is boiled, the microorganisms are killed by the high temperature," Zhu Youxiao explained. "Therefore, drinking raw water, especially unclean water, can easily make people sick."

"So that's how it is." Wang Jizhong saw Zhu Youxiao drinking water calmly just now, and after listening to his explanation, he didn't know why, but he believed it without a doubt, and confidently picked up the teacup and took a sip.

Zhang Yita blinked, looked at Zhu Youxiao in confusion, and asked, "Brother Shen, why do you know so clearly? Does Brother Shen have a better lens that can observe more meticulously?"

Zhu Youxiao pondered for a moment, then held out his hand and said, "Brother Zhang, please lend me your lens for a look."

Zhang Yita handed the lens in his hand to Zhu Youxiao without hesitation. It was originally his most treasured one, but Zhu Youxiao should have a better one, so this one was nothing.

Zhu Youxiao took it in his hand and looked at it. Sure enough, it was the same as the development trajectory in history. Zhang Yita thought of using glass balls to grind lenses. This idea was very remarkable.

But a single lens is a single lens, its magnification has reached its limit, and observing microorganisms will give a sense of distortion.

Nodding slightly, Zhu Youxiao praised, "Brother Zhang has spent a lot of time and thought hard to grind a lens with such a high magnification."

Zhang Yitai shook his head, dismissing the compliment. He looked at Zhu Youxiao intently, knowing there was something else to come. First the compliment, then the segue—that was the Chinese way of speaking!

Zhu Youxiao smiled and said, "To be honest, I also have a lens like this, and it's no better than Brother Zhang's."

"But..." Zhu Youxiao changed the subject and looked at Zhang Yita and said, "Brother Zhang, you should seriously study the knowledge about optics in the book. It will be very inspiring. I already have some ideas. It is an instrument with a combination of multiple lenses, which can magnify more than a single lens."

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