After receiving a relatively satisfactory reply.

Xu Yun walked out of the courtyard and found Mr. Xie, the Old Chief Steward.

He asked him to bring in some servants and maids to place Xiaozhao and Xiaoli in separate guest rooms.

Early the next morning.

Xiaozhao was the first to wake up from the drunkenness.

"Your Highness, Prince Jian."

After Xiaozhao dressed up and just stepped out the door.

Xu Yun, who had been waiting outside the courtyard, quickly approached him, bowed his hands, and smiled:

"I wonder if Your Highness found the night's sleep agreeable?"

Xiaozhao rubbed his still slightly aching head, grinned, and shook his head:

"The bed was quite comfortable, but the strength of the wine was really something..."

Then, before Xu Yun could say anything, Xiaozhao suddenly thought of something.

His eyes flashed, and he proactively asked him:

"By the way, Mr. Wang, did I talk nonsense while drunk yesterday?"

While asking this, Xiaozhao's tone seemed casual, but his expression was slightly tense.

After all, although he enjoyed drinking, he rarely got truly drunk.

In most cases, he was just pretending.

Yesterday, when he heard from Wang Bing that Xu Yun had good wine, he thought it would be no more than the Transparent Bottle Fragrance of the palace.

About twenty degrees or so, like the later versions.

But what he didn't expect was...

The alcohol content of Xu Yun's strong liquor far exceeded his expectations.

And the wine tasted exceptionally aromatic at first sip, so he drank several more without noticing.

When the alcohol kicked in, he started to feel dizzy, and it was impossible to pull back.

Although Xiaozhao was aware that his drinking conduct was quite decent, everything feared the unexpected.

If he really said something out of line, that would be disastrous.

But soon.

Xu Yun's answer allowed him to breathe a sigh of relief:

"Your Highness, Prince Jian, you're asking the wrong person.

This humble man has a weak tolerance for alcohol, and was the first to pass out after two drinks yesterday.

However, before fainting, I vaguely remember Miss Li saying something like 'Your Highness has missed a class for several days and should penalize himself with a drink' and so on..."

Upon hearing this, Xiaozhao was first stunned, then nodded thoughtfully, visibly relaxing:

"I do recall such words, oh, Miss Li is just like that; once she touches wine, she loves to make a fuss.

The song 'As if in a Dream' was just like that..."

Xu Yun could only respond with an awkward smile.

Then Xiaozhao chatted with him simply for a while, confirming several times that he hadn't said anything out of line before quickly bidding farewell and leaving the Su Mansion.

Although Empress Dowager has now passed the most dangerous phase, Xiaozhao no longer needs to stay in the palace constantly.

But as a junior, he still had to greet Empress Dowager Xiang every day.

Xu Yun then turned to another courtyard, preparing to teach mathematics to Old Jia, Han Gonglian, and others.

A few days ago.

After calculating the inclination factor for lenses, the workload on Old Jia and others was significantly reduced.

However, Xu Yun did not let them leave.

Instead, he persuaded Old Su to grant Liu Yi and others the status of guests and continued imparting advanced mathematical knowledge.

Including, but not limited to, modern mathematical symbols, names, and some binomial equations, which were...

like calculus.

The saying remains the same.

Although Song Dynasty's mathematics was very advanced, it still lacked the complete system foundation to derive calculus.

For instance, before Little Niu derived calculus, Europe's mathematical foundation was already solid—relative to that era,

initially having Barrow's theorem on the product and quotient of two functions, along with infinitesimals and numerous conjectures and deductions from predecessors as a base.

Accumulating all this, Little Niu then derived calculus.

Though a genius, it didn't violate mathematical principles.

Song Dynasty's mathematical community, however, was severely lacking in this accumulation.

Even if Xu Yun actually produced calculus, it would only be considered prematurely forcing progress.

Therefore, what Xu Yun could do was inform Old Jia about the few concepts related to variables in the entire calculus system... essentially Little Niu's Flow Technique.

Striving to plant some seeds in the native mathematical community of this timeline, perhaps increasing the difficulty of exams by twenty or thirty points.

Just like that.

In the alternating sessions of teaching Old Jia, Xiaozhao, Xiaoli, and opening special sessions for Old Su.

Twenty days passed in the blink of an eye.

It was early one morning.

After Xu Yun finished his morning tea as usual and walked out of his little hut yawning, he found a little old man standing outside:

Northern Song's "Level Eight Craftsman"...

Siegfried.

Seeing Siegfried waiting specifically for him, Xu Yun hurriedly stepped forward and offered a junior's politeness:

"Master Qi, why have you come, sir? Could it be that the telescope is almost ready?"

Siegfried smiled and bowed his hands, nodding and answering:

"Mr. Wang, the preparation of the telescope is about eighty percent complete. Today, I came to invite you to the Artifact Bureau to validate it."

Then he paused, seemingly remembering something, and added:

"Oh yes, and Miss Li's microscope has been completed as well; you could go and collect it too."

Xu Yun then understood and nodded.

Previously considering the telescope's substantial size and the need for extensive professional equipment for production, Old Su's Family was evidently unsuitable.

After numerous discussions, the production location was finally arranged at the Artifact Bureau.

Of course.

Besides this apparent reason, there was another underlying reason:

The entire process required the consumption of more than five tons of iron.

Mind you.

Iron in ancient Huaxia was a crucial military resource.

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