I studied abroad in modern times

"Yin-Yang Talisman?"

Zheng Fa and Tang Lingwu looked at each other and saw confusion on each other's faces.

No, your dream talisman must have had its effect?

Seeing their expressions, Old Man Bai curled his lips, sat on the chair, stretched his legs out, and the whole chair fell backwards, with only two chair legs supporting the ground. He leaned back in the chair and swayed, with his chin in the sky——

He didn't say a word, but he seemed to have finished all his arrogant words.

"From now on, I must remember the classics of our school clearly. I realized the truth in my dream and understood the origin of yin and yang."

"...Grandpa Bai!"

Tang Lingwu looked at him looking a bit appetizing, and whispered coquettishly.

Old Man Bai glanced at her and waved to the two of them.

"Want to know?"

"Um!"

"Give me your hand."

Tang Lingwu's expression was a little confused, and she obediently handed over her right hand.

Old Man Bai looked at Zheng Fa again and said, "Yours."

Zheng Fa didn't quite understand, so he stretched out his right hand.

"Switch to your left hand."

Old Man Bai put Zheng Fa's left hand and Tang Lingwu's right hand together, palm to palm, fingers to fingers, without any gaps.

Tang Lingwu's face suddenly turned red, and her earlobes seemed to be a little feverish.

But Zheng Fa seemed to be a little surprised.

"This is Yin and Yang."

Old Man Bai said in the same tone as if he was speaking on the podium in his dream.

"...chirality?"

"right!"

Old Man Bai let go of their hands and looked at Zheng Fada: "The most significant difference between the Yin and Yang symbols is the chirality."

Zheng Fa thought about the Yin-Yang symbol in his mind.

It seems to be true!

Old Man Bai was still muttering: "Although I know about this stuff, I didn't study it before... If I hadn't been holding those talisman diagrams in my dream and looking around and seeing my own hands, I wouldn't have thought of this."

Zheng Fa nodded lightly.

Chirality is not a particularly important concept in topology—or in other words, Zheng Fa has not seen it much, only in knot theory.

"The Yin-Yang Talisman, is it that simple?"

Tang Lingwu on the side asked her doubts.

Zheng Fa also understood why she said it was simple - chirality is a very intuitive concept.

To put it simply, there seems to be no difference between your left and right hands, but in three-dimensional space, your left hand cannot turn into a right hand no matter how you translate and rotate it.

This spatial configuration of similar properties is chirality.

Naturally, chirality can be divided into left-handedness and right-handedness.

Zheng Fa recalled that it seemed that the yang symbol corresponded to the left-handedness, and the yin symbol corresponded to the right-handedness.

"It's not simple." Zheng Fa shook his head and said, "This is just the spatial relationship of the symbols..."

Old Man Bai smiled, nodded slightly and said, "Yes, this is an appearance - chirality is not studied much in our mathematics. As far as I know, the most studied areas in this area are biology and chemistry."

"Chiral molecules exhibit different properties."

"I don't know if they have explained this, but what I know is... we don't know why the Yin-Yang symbols show different effects and properties due to their chirality."

Zheng Fa agreed: "And there is another question..."

He and Old Man Bai looked at each other and said in unison: "Yin and Yang complement each other."

Having said this, Old Man Bai grinned and seemed to have a headache: "You know, chiral objects cannot overlap in three-dimensional space, so you can say they are two completely different things, but yin and yang coexist... This shows that they are connected. …”

…

Xuanwei world.

Zheng Fa sat on the collapse and looked at the Yuanfu Daoji in his body with his spiritual consciousness.

This Yuanfu Taoji is still in the shape of two lotus flowers with the bottoms connected.

Chiral configuration.

Yin and Yang complement each other.

As Zheng Fa thought, the lotus platform with the stamens facing down gently shattered and disappeared.

But the next moment, golden threads slowly grew from the bottom of the remaining lotus platform, and later, the lotus platform began to appear again.

This is the yin and yang that Senior Sister Zhang talks about.

But Zheng Fa's eyes widened and he looked at the lotus platform that reappeared.

Before, he thought the golden thread was the root system of the lotus platform.

But this time he saw clearly that these golden threads were actually in the form of thin arcs - more like water waves rippling from the bottom of the lotus platform!

"Mirror image?"

Zheng Fa couldn't help but have an idea in his mind.

The reflection of your right hand in the mirror is actually your left hand.

So the mirror image of the yang talisman is the yin talisman.

The interdependent nature of yin and yang - are they actually mirror images of each other?

In other words, the lotus platform below is actually the reflection of the lotus platform above?

…

Zheng Fa is not yet able to verify this conjecture - Senior Sister Zhang is not here, so he really doesn't have many ways to verify it.

Thinking of Senior Sister Zhang, he picked up the Xuan Lei Stone again and began to practice the "Five Thunder Body".

The bones in his body are now covered with a light golden film, which is a sign that he has completed the bone forging process of "Five Thunder Body".

Now, what he is practicing is the fourth level of the "Five Thunder Body" - blood exchange.

This is the last level before Tianlei body refining.

It was also his final preparation before entering the thunder pool.

In the Xuan Lei Stone, the lightning slowly entered his body like running water, penetrated into his skin, penetrated deep into his muscles, and finally penetrated into his bones, swirling in his bone marrow.

Severe pain!

Zheng Fa suffered a lot when he was a child.

Had a fight with the boy in the field.

Cut by a sickle and a hoe.

There were even near-death experiences——

But I have never experienced such severe pain!

Perhaps because there are many nerves in the bone marrow, the pain is very obvious.

He hunched up and lay on the couch, with beads of sweat on his forehead as he trembled.

This feeling was not the first time he had tried it. Every time before, he would feel that he had gotten used to it.

But every time he felt a kind of despair as if he was on the edge of an abyss.

In his hand, the half jade pendant was tightly grasped by him, and it seemed that it was about to be crushed.

…

Two or three feet away from Uncle Pang’s hall, the shouting from inside entered Zheng Fa’s ears.

“Master! Don’t rush!”

“Save me, save me!” This was Uncle Pang’s voice: “Who can give me a hemostatic talisman?”

“Master, surrender! We are all around you!”

“…”

Zheng Fa shook his head.

This was Uncle Pang and his disciples playing games again.

He did not expect that the first Internet-addicted teenager in Jiushan Sect, uh, old man, was Uncle Pang.

As far as Zheng Fa knew, Uncle Pang came to Leichi this time and specifically asked the headmaster to get a lot of talismans from “Da Dao Zheng Xian”.

But Uncle Pang doesn't bully people when playing games.

He always seals his consciousness and spiritual power, and uses his Qi Refining Stage to play with other disciples.

He doesn't curse when he loses.

He has a good temper.

But there is also a problem - too reckless.

Zheng Fa now strongly suspects that his master's script "Saving Little Cultivator Pang Qian" is based on a real prototype.

Thinking about Uncle Pang's teachings to him now -

Zheng Fa always feels that Uncle Pang is looking for the boy in the game...

Putting aside these miscellaneous thoughts, Zheng Fa gently knocked on the door of the hall.

"Come in!"

As soon as Zheng Fa entered the door, Uncle Pang waved his hand, and the illusion of "The Great Dao Fights for Immortality" in the hall immediately dissipated.

Several brothers looked at each other, and they seemed to be pouting.

Is this... not playing table flipping?

"Ahem." Seeing Zheng Fa's enlightened look, Uncle Pang coughed and said, "What do you want to see me for?"

"My nephew wants to ask Uncle for some information about the Thunder Pool."

"Are you going to enter the Thunder Pool? Have you cultivated to the fourth level of the Five Thunder Body?"

Uncle Pang was stunned, and slowly sat up with a serious look.

"Yes!"

"..."Uncle Pang looked at him for a long time, and didn't speak for a long time, as if he was thinking about something.

"Uncle?"

"Your master told me before he came." Uncle Pang suddenly talked about something else: "He said that if you want to cultivate to the fourth level of the Five Thunder Body, the biggest problem is not resources... but patience."

"..."

"He said that every time he changes blood, he will have to wait ten days and half a month before the second blood change."

As Uncle Pang said, the brothers in the hall looked at Zheng Fa.

Their eyes were different.

"He told me that it was too painful, too bitter, and every time it was like he was being tortured from the inside out." Uncle Pang shook his head and said, "So, he didn't lack black thunder stones back then, but it took him half a year to change his blood in the fourth level of "Five Thunder Body"..."

"And you... you only cultivated it in half a month, why are you in such a hurry?"

Zheng Fa lowered his head and said, "Although Senior Sister Zhang is safe now, she has been missing all the time, and her situation is not very good as you can imagine."

Uncle Pang was silent again.

"...Nephew Zhang, you didn't make a mistake." Uncle Pang shook his head, waved his hand, and several jade tubes flew in front of Zheng Fa: "This is the news about the Thunder Pool in the market, and some experiences of my Nine Mountain Sect disciples, you can take it."

Zheng Fa put away several jade tubes, bowed to Uncle Pang, and turned to leave the hall.

Watching his back slowly walking away, Uncle Pang looked far away, wondering what he was thinking.

"Master, are you still playing?"

Seeing that he didn't speak for a long time, a disciple beside him asked in a low voice.

"Play, play, play! You only know how to play!" Unexpectedly, Uncle Pang exploded: "Look at Zheng Fa, he practices so hard, how come you only know how to play?"

"..."

"He endured the heart-wrenching pain for Junior Brother Zhang and practiced desperately, what about you? If my master disappeared, can you do it?"

"...Disciples must go through fire and water..."

The group of disciples said one after another.

"Get out! Don't I know you?"

Uncle Pang snorted, patted his hand forward, and the disciples fell out of the hall one after another.

Looking up again, the hall door was closed tightly.

The disciples looked at each other, not daring to speak, and left together.

After walking away, a disciple expressed his doubts:

"Playing "Dao Zhengxian"...isn't it the game organized by Master? We have to play!"

"Master is jealous of Senior Sister Zhang."

What a disciple said made several people nod repeatedly.

"That's right, we can't beat Junior Brother Zheng." A disciple said a little frustrated.

"We can't beat Zheng Fa, so our master can't beat Senior Sister Zhang either?"

"Ah?"

This made the others a little skeptical.

No matter how powerful Senior Sister Zhang is, their master is a Yuanying Zhenren.

"Just think about it, if Senior Sister Zhang had the face of our master, would Zheng Fa be so anxious to save her?"

"..."

"Would you?"

"...Although she is our master, Senior Sister Zhang didn't have a good relationship with us before..." A senior brother said, "But you shouldn't blaspheme Senior Sister Zhang like this."