Yu Yuan stayed in the Jade Pillar Cave Heaven for a few days and strolled around the nearby area. He saw piles of artifact refining waste and semi-finished products, as well as some flawed Spiritual Treasures and Spiritual Weapons.

It seemed that these treasures were very familiar to the eye.

For instance, the Sky Flipping Seal, Yin Yang Mirror, Five Fire Seven Feather Fan, Mountain and River Map, and so on.

Of course, all of these here were imitations, and moreover, they were damaged. It was unknown whether the owner of this place had succeeded in forging any vaguely decent treasures.

Through these items, Yu Yuan could tell that Yun Zhongzi indeed had a great passion and immense talent for artifact refining.

This was also why Yu Yuan had originally brought the Heavenly Sound Bell here for Yun Zhongzi to help repair.

After touring around the entire grotto heaven, Yu Yuan spent his days drinking and enjoying himself, while occasionally guiding the plant elves in dance rehearsals.

After all, there's no harm in relaxing and truly enjoying some leisure time when one is idle.

Hmm, the joy of being an Immortal is just so simple and plain... yet tedious.

When the young Taoist saw how well he got along with his master, laughing and calling himself "uncle" without angering the master, he immediately understood that, even if they weren't truly relatives, their relationship must be very close.

Thus, for the past few days, he behaved very sweetly, bringing all sorts of fruits and Immortal Brew for Yu Yuan to enjoy.

Seeing Yu Yuan teaching the plant elves to rehearse their dance, he also volunteered to bring out some string and wind instruments. Using a clumsy Clone Technique, he became a one-man band, playing and singing all by himself.

Yu Yuan couldn't help but smile, casually pointing out the shortcomings of his Clone Technique, prompting fervent thanks.

The days passed quickly, and when Yun Zhongzi emerged from his Artifact Refining Workshop, he was immediately shocked by the scene before him.

He saw a group of attractive and shapely plant elves wearing gorgeous palace dresses, dancing an unknown type of dance neatly on the grass.

Their movements were sometimes light and graceful, and sometimes intense and eager, like spirits inspired by melody with each turn creating a gust of wind, and colorful dress hems fluttering in it...

Yun Zhongzi's eyes widened, and for a moment, he couldn't bear to look away... Were these the same shy and timid plant elves from his grotto heaven?

How come in just a few days, they had changed into something he couldn't recognize?

"Cough cough, that's enough for now, disperse, disperse."

As the instigator, Yu Yuan waved his hand. After the plant elves reluctantly bowed and retreated, he turned to look at Yun Zhongzi and smiled, saying, "How about it, is it good?"

"Mission accomplished," Yun Zhongzi nodded slightly. With a wave of his hand, nine copper mirrors floated out in mid-air, neatly arranged in a Nine Palace Formation in front of Yu Yuan.

"Please look, my friend. I've marked these nine copper mirrors according to the Nine Palace Formation. The mirror in the Central Palace is the leader of these nine, able to freely open and close communication with the other mirrors, and also detect the position of the other mirrors...

Additionally, these nine mirrors each have fifteen Acquired Restrictions, qualifying as mid-grade Acquired Spiritual Treasures. They have a certain Defense strength, and within them is a small Heaven and Earth that spans over a hundred miles, too small to store much, only some miscellaneous items."

The more Yu Yuan listened to Yun Zhongzi's explanation, the more familiar it seemed.

Isn't this just a local area network?

The Central Palace mirror has administrator rights, able to disconnect others at any time, and can even lock IP addresses!

For Yu Yuan, the Defense strength and storage space were not too important; he wasn't too concerned.

A mere mid-grade Spiritual Treasure, after all; just having the communication capability was already very practical. Why would he covet more?

"All nine mirrors are here, now entrusted to you, my friend."

Yun Zhongzi gestured, and the nine mirrors came together, landing in Yu Yuan's hands.

Yu Yuan did not hesitate, immediately taking out a mirror marked with the character "Gen" and handing it to Yun Zhongzi with a smile, "Take this, my great-nephew. If you need any materials for artifact refining, just send a message. Your Uncle here will definitely arrange it for you!"

Hearing this, Yun Zhongzi's eyes clearly lit up.

He reached out and took the mirror, and without minding Yu Yuan's jest about being his "nephew and uncle," he said earnestly, "Hearing my friend say so, I indeed have quite a shortage of artifact refining materials... Wait for a moment, my friend, I will make a list for you."

"Ha?"

...

After a long while, Yu Yuan left the Jade Pillar Cave Heaven with the eight mirrors, and the artifact refining materials he kept in the Clear Glazed Bottle had also diminished by more than half.

"This nephew sure doesn't hold back!"

Yu Yuan shook his head, but felt much more relaxed in his heart.

Though the Jie Sect and Human Sect are currently at odds like fire and water, his relationship with Yun Zhongzi doesn't seem to be too affected.

It's just uncertain whether they could continue to be like this if the conflict between the Jie Sect and Human Sect intensifies.

If possible, he would indeed like to bring Yun Zhongzi into the Jie Sect.

But given Yun Zhongzi's temperament, unless Taiyang rises in the west, that's absolutely impossible.

Therefore, Yu Yuan never brought up the matter, simply giving him one of the mirrors.

Well, let's not think about that for now.

Yu Yuan shook his head and summoned the Golden-eyed Five Clouds Camel, heading towards Linhuan Pass located to the southeast of the Southern Continent.

It had been several years since he had last visited Linhuan Pass.

Although the intelligence reports from the Nine-tailed Fox clan mentioned that the place was developing quite well, with new and novel things emerging every now and then, those Nine-tailed Foxes, after all, lived long lives but had short insights and couldn't really explain why.

Therefore, Yu Yuan wasn't completely at ease until he went to see for himself.

Several days later.

A hundred miles away from Linhuan Pass, in a desolate area, Yu Yuan rode the Golden-eyed Five Clouds Camel and descended from the clouds.

He saw something very novel, something that shouldn't exist in this world.

It was a windmill, and quite a gigantic one at that.

Standing tall on the open plain was a wooden tower, reaching the height of more than a dozen zhang, with four wide windmill blades forming a "十" shape; each one several zhang long.

The bones of the blades were also made of wood, while the surfaces were woven from a kind of highly resilient silk, looking very sturdy.

As the breeze gently blew by, the huge windmill began to slowly turn in the wind.

At the same time, inside the wooden tower, a gigantic millstone began to turn slowly under the drive of the wooden transmission mechanism.

Hundreds of strong and tall humans were pouring grain from bamboo baskets into the millstone.

As the millstone turned, the poured-in grains were slowly ground, husked, and ultimately turned into fine powder, which was then bagged into a sack made of linen.

The whole process was very crisp and efficient, and it didn't seem like their first time operating it.

Yu Yuan did not approach but simply stopped and quietly watched this scene.

He carefully inspected the windmill and noticed a circular contraption-like component at the joint, connected to a somewhat heavy metal frame.

The purpose of this metal frame was to secure and adjust the orientation of the windmill, so by timely adjustments, it could always face into the wind.

As long as there was wind, the windmill could keep turning!

Although Linhuan Pass already had a water wheel, after all, within the territories of the Human Race, only a few were close to rivers and water areas, and the possibility of building water wheels depended on the river sections and current speed. It was difficult for most human settlements to construct water wheels and harness water power.

Windmills, on the other hand, would obviously be more suitable for the inland areas of the Human Race.

As long as a windmill was built where there was wind, the locals would effectively have a tireless, enormously strong laborer that could work for them every day!

"It seems that Wen Zhong is quite the practical one."

Yu Yuan nodded slightly, feeling that Wen Zhong had done better than he had imagined.

Indeed, he was worthy of the title "the pillar of the state who could fortify the country with the pen and secure it with the sword," Great Teacher Wen Zhong!

Although he was still young, his ability to govern the country and the home was already showing.

Riding the Golden-eyed Five Clouds Camel, Yu Yuan followed a familiar route to the southern gate of Linhuan Pass, and from afar he could hear people shouting: "The Immortal is giving a lecture, the Immortal is giving a lecture..."

Many teenagers and youths excitedly left their homes and rushed into the woods.

Even a number of adult men and women followed behind.

In the woods, there was still that straw cottage.

But now, there was a larger clearing in front of the cottage, accommodating even more people who came to listen to the lecture.

Among these people were children, youths, elders, as well as citizens of Linhuan Pass and villagers from nearby... everyone sat quietly with ears perked up, listening intently to the Immortal's lecture.

Even though the Immortal never spoke about cultivation matters, everyone still listened eagerly.

Especially the easy-to-understand courses like hygiene and animal husbandry, men and women, young and old, could all grasp them, and as long as one listened attentively, they could almost learn everything taught.

However, the "math class," "arithmetic class," "physics class," and others that the Immortal taught were one more complex and harder to understand than the next.

But learning these could prove to be very useful.

And strangely enough, many children learned these subjects much faster than adults.

Many questions that caused adults to wrack their brains without an answer, those half-grown kids solved with ease.

"The math class is over; next, we will study Qihuang Pharmacology. Those who are interested can stay behind, and another teacher will explain it to you," Wen Zhong said, turning his head towards the straw cottage.

Outside the woods, a hint of surprise flashed in Yu Yuan's eyes. How could there be another teacher?

Just as he was puzzled, a middle-aged Daoist in a green Daoist robe walked out of the straw cottage, first lifting his head to look at Yu Yuan outside the woods, and then smilingly turned towards the students who stayed to listen and said, "Next, I will be the one teaching you..."

How could it be him?

Yu Yuan was slightly stunned.

He really hadn't expected to see the man here.

The first disciple of the Human Sect, Great Master Xuan Du, was actually here teaching classes!

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