“Damn it!”

Even with Lin Xian’s ability to move heaven and earth, he couldn't keep it together in the face of this horrifying scene! He directly leaped towards the bathroom's glass door and jumped out.

Too terrifying!

What was going on?!

A reflection in the mirror being out of sync with reality was already exaggerated enough, enough to make one's scalp crawl…

If he hadn't seen wrong just now…

The hand holding the Genius Club invitation! It had stretched out from the mirror!

Was this some kind of late-night ghost story?

Sadako at least crawled out of a CRT television, which could barely be explained from a physics standpoint, but a mirror was just a reflection of light!

The objects in the mirror were all virtual images.

How could they possibly come out?

What's more…

The person in the mirror who was out of sync with him and smiling at him was himself!

So if the one in the mirror was Lin Xian with free will…

Who was he?

Had everything been turned upside down?

……

Standing at the bathroom door, he turned his head back.

Lin Xian discovered that the strangeness in the mirror had completely disappeared.

No one was there.

As always, it reflected the clutter in the bathroom… the bottles and jars on the sink, the washing machine in the corner, the overturned stool on the floor, the towels on the rack, and—

At this moment, lying quietly on the porcelain sink, as red as fire, with golden lettering…

The Genius Club invitation!

Lin Xian blinked.

He stared incredulously at the invitation taken from the mirror…

This was too contrary to common sense and simply incomprehensible.

Was he dreaming?

Could it be that… he was too sleepy propping his chin up in the bathroom and had fallen asleep?

So was he dreaming now?

But he turned his head to look at the digital clock placed in the corner of the sink.

The time displayed on it:

[00:43]

"I don't dream at this time."

Lin Xian said softly.

He knew too well that in his 25 years of life, his dreams would always wake him up promptly at 00:42. After that time, even if he fell asleep immediately, he would definitely not dream unless it was until 12:42 the next day, when a new cycle of dreams would begin.

"What… is going on?"

Lin Xian took a deep breath.

Then he cautiously took a step further into the bathroom, allowing himself to appear at the edge of the mirror.

He saw that Lin Xian in the mirror was also cautiously, tentatively looking out of the mirror.

Lin Xian took two more steps forward.

The Lin Xian in the mirror also took two steps forward.

Lin Xian waved his right hand.

The Lin Xian in the mirror also waved his right hand.

"Looks like everything is normal now."

But even though the mirror was now normal, Lin Xian's suspended heart did not relax at all and remained tense.

His eyes glanced at the Genius Club invitation on the porcelain sink…

Its existence was solid proof of the horrifying and supernatural scene just now.

Even if the mirror was normal now…

It couldn't cover up the impact that abnormal scene had brought to Lin Xian's worldview.

He lowered his head again, looking at the digital clock.

It jumped lightly again.

The time displayed on it jumped from 00:43 to 00:44.

"So, that unscientific scene just now happened between 00:42 and 00:43, within this minute."

He inexplicably thought of the Seven Deadly Sins organization led by Ji Xinshui and Ji Lin.

Although this organization might have been misled, no matter the process, their execution of the rule to murder scientists was very rigorous and harsh.

A car accident was a must.

Even more necessary and difficult to control was the time of death of those scientists—

Also within the minute of 00:42-00:43.

Who stipulated this time?

According to current speculation, there were two possibilities.

1. It was requested by Copernicus, a suspected member of the Genius Club, to Ji Xinshui; so even if Ji Xinshui did not understand the deeper meaning of this time, he had to blindly and rigidly execute it because he was eager to join the Genius Club.

2. It was not requested by Copernicus, but as Lin Xian and Ji Lin speculated, Ji Xinshui was blindly imitating the Genius Club's killing behavior; that is to say, Ji Xinshui witnessed or knew about a murder event personally carried out by the Genius Club, which was executed by a car accident at 00:42, so he would strictly imitate it without knowing why.

……

In his confession, Ji Xinshui did not clearly state the reason and origin of the killing time point of 00:42.

He only said that he would require his subordinates to strictly control the target's time of death within the minute of 00:42-00:43.

When the police asked Ji Xinshui why it had to be this time,

This unrepentant old man smiled strangely and said meaningfully:

"【Letting them die at 00:42 is the highest respect for them.】"

The female police officer in charge of the interrogation at that time couldn't help but scold him as a madman. No matter how she inquired about this question, Ji Xinshui kept silent and only silently confessed his criminal facts.

Lin Xian picked up the digital clock.

He weighed it.

So to speak…

The time point of 00:42 should really have some special meaning.

It was not only the end time of his dream, the birth and disappearance time of the Millennium Pile, but also closely related to certain behaviors and tenets of the Genius Club.

Therefore…

It was no wonder that he would receive the Genius Club invitation at 00:42.

If it was really as Ji Xinshui said…

00:42 was a very sublime time point, a time point full of respect… Then it was reasonable for him to receive the invitation at this special time point. Even, if this was a real Genius Club invitation, it had to be obtained at this time to be the most ceremonial.

He pondered again what the Oriole said when she first gave him the mirror riddle.

It seemed…

This Genius Club invitation was what the Oriole said he wanted most, so she repeatedly reminded him in the mirror.

That was also the truth.

Whether it was the past self or the present self, what he wanted most was indeed this Genius Club invitation.

The past self had just solved the Seven Deadly Sins case and was eager to know what kind of organization the Genius Club was, what they wanted to do, and what its nature was.

The present self even wanted to join the Genius Club, and meet those so-called geniuses face to face, to see what they were up to. And… he hoped to find the truth about the Millennium Pile in the Genius Club and rescue Chu Anqing!

The Oriole kept saying "mirror, mirror," and he had indeed looked in the mirror many times for a long time.

But who would have thought that…

Her so-called "looking in the mirror more" meant to let him try his luck and happen to look in the mirror at 00:42…

But this time point was too targeted for him.

When he first received the mirror riddle, he was still in the third dream, parachuting and copying code day and night, waking up every day already at 00:42. So he didn't have time and didn't think that he had to look in the mirror at this time.

Later…

The third dream became the fourth dream.

He was even busier every night, not only changing the time to enter dreams to test the tightness of the encirclement and test the mysterious old man's reaction to different names; he also had to check every day whether the Taylor Bank airship had appeared. His dream schedule was fully arranged, and he woke up already past 00:42.

But that wasn't the main point…

Anyway, although it was a little late, he finally successfully cracked the mirror riddle.

But the problem was…

"Why a mirror? Why does such a supernatural event happen specifically in the mirror?"

Lin Xian scratched his head, walked to the sink, and looked closely at the mirror.

The Lin Xian in the mirror also leaned over, eyes wide, eye to eye with Lin Xian.

This was an ordinary mirror.

He had used it for several years, so ordinary that it couldn't be more ordinary, so normal that it couldn't be more normal.

He came to the side again to confirm.

Through the gap between the mirror and the wall, he could even see the tiles on the other side. This indicated that the mirror was indeed normal, not a magic trick, and hadn't been tampered with.

"This means that the focus is not on the mirror, but on the eerie time point of [00:42]."

"In this supernatural event, the mirror is only the foundation, not a necessary condition, so staring at it for any length of time other than 00:42 is meaningless."

"It must be at 00:42 that the reflection in the mirror will become out of sync, and be able to cross the mirror surface, stretch out a hand, and hand over the Genius Club invitation…"

He couldn't figure out how the shadow in the mirror could become a solid object, when it was clearly a shadow, a virtual image, a reflection of light.

Lin Xian had to come up with a scientific explanation for this.

He was a warrior of materialism and couldn't accept supernatural events. Moreover, the Genius Club was not a supernatural organization to begin with; they also abided by the laws of the universe and the laws of physics. At least for now, there were no supernatural abilities or extraordinary powers.

Even time travelers like the Oriole and Millennium Piles like Chu Anqing were also restricted by the laws of time and space. Jask and Kevin Walker had never broken through the limits of humanity.

This meant…

"Existence is reasonable."

"Since the mirror becomes strange at 00:42, as if it is connected to other spaces… it means that it is allowed by the laws of the universe."

"Since it is within the laws, it must be explained clearly by rules and laws."

Lin Xian rubbed his chin.

He seriously thought about this.

Mirror, space, crossing, penetration…

Suddenly.

He suddenly remembered a concept that Liu Feng had proposed—

【Space-time rift】!

Back in the East Sea University laboratory, when the two of them were discussing how space-time particles came from other time-spaces to this time-space, Liu Feng said that time-space and time-space might not be completely isolated. Perhaps there were some unexplained rifts in the wall of time-space.

It was precisely because of the existence of these rifts that time travel became possible.

Not only humans who have mastered a certain technology could travel from other time-spaces to this time-space; space-time particles could also drift over from space-time rifts and become outsiders in this time-space.

Then, to make a rigorous and broad inference.

Since humans and space-time particles can pass through space-time rifts, why can't his arm and the Genius Club invitation pass through space-time rifts?

In an instant.

Lin Xian suddenly understood.

He felt like he had grasped the answer…

The concept of space-time rift itself was very abstract.

Lin Xian and Liu Feng couldn't explain what space-time rifts were like, where they were, and under what circumstances they would be discovered.

It was just because the description of "rift" was relatively straightforward and common, so the two of them called the path through which these things traversed time-space as a space-time rift.

But it was obvious.

A space-time rift was not a rift or a broken opening in the true sense.

Instead, it existed in other indescribable and incomprehensible ways.

For example…

What had just scared him in front of him…

The mirror at 00:42.

"Space-time rift."

Lin Xian muttered this concept:

"Perhaps the existence and appearance of space-time rifts are also related to the special time point of 00:42."

"Thinking about it this way, what happened in the mirror at 00:42 can be explained more easily if it is connected with space-time rifts."

Thinking of this.

Lin Xian couldn't help but breathe a sigh of relief…

Fortunately.

The supernatural event just now seemed to be temporarily and barely explained by the theory of space-time rifts.

No matter whether this theory was currently correct or not, it could at least prove that the situation just now was not a scary ghost story or supernatural event.

Human cognition was strange in this respect.

Many people were not afraid of going to space, extreme sports, surviving near-death experiences, and fighting enemies…

But no one seemed to be truly immune to things like gods, demons, and ghosts, whether in ancient or modern times, in China or abroad. They were always frightened by various true or false supernatural events.

"Forget it, I won't think about this for now."

As long as he was sure that he was still in a materialistic world, Lin Xian was not so horrified. He accepted the theory of space-time rifts calmly:

"Let's take a look at the invitation first. This invitation was carefully selected by the Oriole… It's almost 100% certain that it's real."

He lowered his head.

Looking at the red invitation placed face down on the sink, he reached out and picked it up.

The touch was completely different from the fake invitation.

He could feel the exquisiteness and nobility as soon as he touched it. The outer edge of the card paper used a plush edging process, and the hand feel was very comfortable.

The weight also seemed to be heavier than the fake one, a little bit heavier.

Lin Xian turned the invitation over and looked at the front…

The first thing that came into view was naturally the sealing wax block with the Genius Club emblem and English name stamped on it, which he had already been familiar with and contacted many times.

This time, the round and flat wax block looked thicker than the fake one before and the one Jask had given him. The color was also darker, and he didn't know why.

Was it the image of the light in the bathroom?

It shouldn't be. The lights in the bathroom were still very bright.

Perhaps because this was the real thing, the wax block that the Oriole and Jask made seemed more like handicrafts made by themselves. It was far less exquisite, classical, and full of the charm of the years than the current one.

Lin Xian pinched the wax block with his right thumb and forefinger, and lifted it up to open this long-awaited and hard-won invitation.

"Huff…"

Lin Xian couldn't help but let out a long breath.

He inexplicably felt a sense of heaviness and ceremony.

He moved his index finger and completely turned over the folded page of the invitation, looking at the contents inside the card paper—

"Huh?"

He blinked, unable to believe it:

"It's empty?"

He looked at the side and indeed there was only this bare page.

But why was there not a single word, not even a symbol or a pattern?

Lin Xian turned the angle again and looked carefully.

Still nothing.

The card paper of this invitation was very high-end and very delicate. You could see some decorative shallow lines on the paper, which looked very beautiful and grand.

But…

Shouldn't a normal invitation have the most basic invitee's name, honorifics, invitation matters, and the time and place of the gathering?

What did it mean to give him a blank invitation directly?

Even if he took ten thousand steps back.

This invitation was not registered, and whoever grabbed it got it, then at least there should be a gathering time and place, right?

"Didn't they forget to print it? Are these geniuses reliable?"

Lin Xian was really speechless.

What was going on?

The invitation had already been sent. Was it necessary to be cryptic?

"It shouldn't be so endless."

Lin Xian shook his head.

He suddenly thought of one thing…

His invitation was sent to him by himself in the mirror.

Then how did other Genius Club members get their invitations?

Also through the mirror?

Also sent by their future selves through the mirror to their past selves?

Judging from the Genius Club's mystery and time-space correlation, this guess might not be correct.

Lin Xian had long believed.

The Genius Club's invitation was not so easy to obtain, and it would never be sent by courier or in person like sending invitation cards.

That would be a bit Low and unworthy of the name of the Genius Club.

But now…

Lin Xian felt that the method of sending invitations through the mirror and letting the future self send them was too advanced!

"Very genius."

Lin Xian recognized:

"But it's also very abstract. The members of the Genius Club must have a healthy and solid heart, otherwise they would have been scared to death by the wave in the mirror."

However.

This was also his baseless speculation.

Perhaps each member had a different way of obtaining the invitation; or it was possible that only he was special; or it was possible that the one he had was obtained by the Oriole cheating for him… so the way to obtain it was so strange.

Because Lin Xian knew himself.

Compared with anyone like the Oriole, Copernicus, Jask, or Kevin Walker, he was not qualified to join the Genius Club and was not qualified to receive this invitation.

He really couldn't be considered a genius at all.

Nor had he done anything earth-shattering.

As far as he was concerned at the age of 25, he didn't have the Oriole's leadership style, Jask's wealth and intelligence, Kevin Walker's advanced era, or the mysterious Copernicus's dragon-like figure… playing the Seven Deadly Sins and the world's top scientists in the palm of his hand.

Compared with these true geniuses.

Lin Xian admitted that he was still too weak.

"Is it really possible that my invitation was obtained by the Oriole cheating and going through the back door for me… so it's so secretive and can't be seen in the light?"

He could only find a chance to ask the Oriole about this question.

Now.

He should still think of a way to see if he could find the information hidden on the invitation.

In short, without knowing the time and place of the gathering, this invitation was almost like a blank piece of paper.

He closed the folded page of the invitation again.

Only then did he discover the abnormality of this sealing wax stamp…

【There is something hidden inside!】

When he turned the page just now, the sealing wax stamp affixed to the folded page was upright, and it was also that angle that reflected the incandescent lamp above his head, allowing Lin Xian to notice that a black unknown object was sealed inside the sealing wax block through the warm red light.

No wonder this wax block was unusually thick and the size was a little larger than normal.

Lin Xian directly twisted off the complete wax block.

He held it in his hand.

He held it overhead and looked at the incandescent light.

"Sure enough."

He narrowed his eyes.

In the middle of the red wax block, there was indeed a fuzzy black object sealed inside. It was roughly also round and flat and not so thick, but he couldn't see clearly what it was because the sealing wax stamp was made of a mixture of rosin, paraffin wax, and tar, and had very poor light transmission.

"Let's break it open and see."

Lin Xian now had three wax blocks stamped with the Genius Club emblem in his hand. They were no longer precious things. He even copied and printed them himself, so he could tear them down and didn't need to feel bad about it.

He took a small screwdriver and started poking at this sealing wax block.

He was very careful and slow, for fear of damaging the things inside.

It took a few minutes.

Lin Xian finally removed all the outer layer of sealing wax and took out the thing sealed inside intact—

It was a bright gold badge, a standard circle, slightly larger than a one yuan coin, not much different from the badges that people usually pin on the left chest of their suits. There was also a small pin on the back. It was indeed a badge.

"Is this the real invitation, token, and symbol of identity?"

Lin Xian looked at this gold badge.

It was much heavier than he imagined. It was likely made of gold, but it shouldn't be pure gold.

Because pure gold was too soft and easily deformed. It was rarely used to make delicate ornaments such as badges.

So… this should be an alloy of some material, with a large proportion of gold, so it felt heavy in the hand.

Whether it was the front or the back, it was evenly bright gold.

On the front of the badge, unsurprisingly, the Genius Club emblem was carved in relief.

The back of a hand stretching out its right index finger, pointing straight to the sky.

Then below the wrist, the English letters of genius Club were also embossed.

"I see…"

Lin Xian held this gold badge that symbolized membership in the Genius Club. It seemed that his guess was correct. This was the real invitation.

So Jask only gave him a fake wax block at the beginning.

If he gave him that badge… then he probably wouldn't be able to attend the Genius Club meeting, right?

But now, new problems had arisen again.

What could a simple gold badge prove? This exquisite craftsmanship was not difficult to imitate, not to mention the problem that made Lin Xian feel tired and anxious—

Where was the meeting time? Where was the location, bro?

How exactly do you meet and hold meetings!

Lin Xian clenched the gold badge in his palm, then lifted up the chair that had been kicked to the ground, sat on it, and began to think about the details he had ignored…

First of all, as he had just thought, this gold badge should not be a simple ornament.

Because it was too easy to forge.

If this thing was used as a symbol of identity for members of the Genius Club, it would be too crude and not genius enough.

Secondly, Lin Xian also thought about whether there were some electronic components inside this badge.

But the thickness of this badge certainly couldn't fit a button battery, even the smallest and thinnest one.

Finally, he also carefully checked many times, and there were no hidden buttons, hidden spaces, or hidden information on this badge.

Then…

Were there any other ways to store a lot of information in the badge and allow the invitee to read it without a power supply and without destroying the original structure?

Suddenly.

Lin Xian opened his eyes:

"【NFC】."

He thought of the access control card in the community, his second-generation ID card, the meal card in the university cafeteria, and the former bus and subway all-in-one card in East Sea City!

There was no battery supply in these cards.

But they all belonged to NFC devices. As long as they were close to a special reading device, the internal voltage would be triggered by the magnetic field generated by the reading device, which would then form a current to transmit data.

This was the principle of electromagnetic induction coupling technology, which was widely used in daily life.

Access control cards, ID cards, meal cards, bank cards, transportation cards, membership cards, and even Nintendo's amibo toys… all used the NFC principle, which could store data and transmit information without an active power supply.

"So, this gold badge is likely to be a small device similar to an NFC access control card! You only need to be close to the NFC reading device to read the internal information!"

Lin Xian directly took out his mobile phone from his pocket.

Now most mobile phones have long supported the NFC card swiping function, and can even simulate NFC signals. It was no longer a high-end technology.

Of course, mobile phone NFC simulators can only simulate some simple and unencrypted NFC signals, such as access control cards.

Like encrypted meal cards, bank cards, ID cards… it was difficult to simply simulate this kind of NFC signal. The higher the encryption level of NFC, the less likely it was to be cracked and copied.

After taking out his mobile phone.

Lin Xian directly put the gold badge close to the mobile phone—

Beep.

The mobile phone made a soft sound, automatically recognized the NFC signal, and then the browser App popped up and began to constantly jump to web pages.

"I guessed right."

Lin Xian smiled lightly.

Although this was not a difficult puzzle, and there was nothing to be proud of, he finally guessed one step correctly, and he was one step closer to attending the Genius Club meeting!

On the mobile phone screen, the web pages were still constantly jumping, and he didn't know where they would eventually jump to.

Lin Xian had a whim.

If VV was still here, would he be able to find the Genius Club's base camp by tracking the signals of these web page jumps?

In theory, it should be possible.

But…

Considering Kevin Walker, the strongest hacker on earth,

VV, who had been iteratively evolving for half a year, was unable to track down Kevin Walker's address and true identity.

Therefore.

If this set of NFC identification system and network jump logic was designed by Kevin Walker, then the now severely damaged VV would also find it difficult to find the source of the server in a short time.

In the final analysis, Kevin Walker, this genius, was too strong.

He could even defend against a super artificial intelligence 600 years later. It was unbelievably powerful.

But Lin Xian didn't care where the Genius Club's base camp was for the time being.

He would consider these things after VV was resurrected.

His primary goal now was to personally attend the Genius Club meeting and face those geniuses directly.

He would collect intelligence, search for clues, and finally… eliminate Kevin Walker, and even Jask, and even that mysterious old man in the fourth dream. In short, all the enemies would officially enter his sight.

And when he solved the immediate crisis and ensured that no one could threaten VV's existence, it would be the time for him to resurrect VV.

When his old friend returned, his combat power would increase several times.

At that time.

What was the nature and position of the Genius Club… In short, he had to become stronger and have the power to fight them.

After all, his ultimate goal was to rescue Chu Anqing!

A real man keeps his word.

Since he promised Chu Shanhe to bring Chu Anqing home.

Then.

No matter who he was going to face.

Whether it was the Genius Club, the laws of time and space, or an even more powerful enemy above the laws of time and space.

He would also do his best to snatch Chu Anqing back!

Finally.

After several minutes of constant web page jumping, the content on the web page was finally displayed.

It was an extremely simple website, reminiscent of the BBs network forum style of the 1980s.

A pure black interface with a line of white text in the center:

【Please enter any space-time coordinates.】

This was obviously a question.

Then below the question, there was a rectangular white text box, which was the place to enter the answer; to the right of the answer box, there was also a gray "Confirm" button.

This was…

A kind of exam?

Lin Xian looked at the top of the web page, where there was a 1/3 mark.

This probably meant that there were three questions to answer. Only by answering the first question correctly could he see the second question.

Below the answer box, there was also a line of small white text:

【Geniuses never make mistakes, so you only have one chance.】

……

Lin Xian stared at this web page.

He probably understood the real process of joining the Genius Club.

The invitation, in short, was just a stepping stone, an admission ticket.

To truly join this mysterious organization, he had to complete three exam questions.

Perhaps after answering the three questions correctly, he would be truly invited to join the Genius Club, learn the time and place of the gathering, learn the club charter and precautions, and then he could officially meet those arrogant geniuses.

"The threshold is really high…"

Now Lin Xian was 80% sure that his invitation was definitely obtained by the Oriole through connections and cheating.

The first exam question in front of him:

【Please enter any space-time coordinates.】

It was hard to imagine.

What kind of question was this?

What were space-time coordinates?

Why ask this question?

Moreover, there was only one chance to answer.

It seemed that if he answered wrong this time, he would permanently lose the qualification to join the Genius Club.

"Space-time coordinates."

Lin Xian read out this new term.

He didn't understand.

But there was no doubt that this question could confirm his previous guess…

The Genius Club was indeed related to time-space.

Perhaps they had really mastered the power to manipulate time-space, so they could ask a reserve member such an arrogant question as "space-time coordinates."

Thinking back to the strange way he obtained the invitation, space-time rifts, 00:42, and these other chaotic events mixed together.

Lin Xian increasingly felt that the Genius Club's power was probably far beyond his imagination.

They even understood space-time coordinates.

Then the act of sending invitations through mirrors and space-time rifts just now might not be uncommon.

Lin Xian closed the web page on his mobile phone.

He would not waste this only chance, which was also his only hope to join the Genius Club.

There was only one chance to try and make mistakes.

Therefore, he would not try it lightly before he had a complete grasp of what space-time coordinates were.

"I have to go ask a professional about this."

Lin Xian held the gold badge and said in a low voice.

……

The next day.

East Sea University, Rhine Joint Laboratory.

"Liu Feng, what exactly are space-time coordinates? How do you understand them?"

Lin Xian didn't tell Liu Feng about the Genius Club invitation or the mirror. He directly asked for his understanding of space-time coordinates:

"Does each different time-space have different numbers?"

Liu Feng thought hard for a while and shook his head:

"It shouldn't."

"People in each time-space have no communication or way to communicate. Each time-space thinks that it is the main time-space and the earliest timeline. How can they be numbered? There is no benchmark at all."

He picked up the chalk, came to the blackboard, and drew several divergent rays from a small point:

"In the world line theory, each different node selection will diverge different world lines, leading to different futures, and creating different possibilities… Under this theory, the earliest world line is generally named the α world line."

"Then, if on the α world line, some behavior and actions affect the future direction, then it may shift to the second world line, which is the second possible future, which we generally call the β world line."

"Similarly, the third possible future is the γ world line; if other possible futures can still be split, it is the δ world line…"

"These four Greek letters, alpha, beta, gamma, and delta, don't have any special meaning. They are just to distinguish the several world lines. If you want to save trouble, you can even directly call them the first world line, the second world line, the third world line, the zeroth world line, etc."

Lin Xian nodded.

He could understand this point without Liu Feng explaining it.

Wasn't that how he named the different future dream worlds?

The first dream, the second dream, the third dream, and the fourth dream were completely consistent with the theory of world lines.

"So, do you think that these alphas and betas, or firsts and seconds, are space-time coordinates?"

"No, no, no."

Liu Feng waved his hand:

"How could it be so simple? These are all subjective names and don't have versatility. Think about what the concept of coordinates is? Similar to longitude and latitude, each coordinate point is unique. For example, the longitude and latitude of East Sea City are 31 degrees north latitude and 121 degrees east longitude."

"This is East Sea City's [coordinates], unique on Earth, only one copy. When it comes to this coordinate, only East Sea City meets the requirements. This unique accuracy meets the definition of coordinates."

"So, if you must expound the concept of [space-time coordinates], then I think its manifestation should also be similar to longitude and latitude. It must be unique, accurate, and you can immediately locate a specific time-space as long as you say the coordinates, without any objections or deviations."

"That's what I think too." Lin Xian said:

"But if we want to know the space-time coordinates of a certain time-space, what should we do? We don't need to know a specific one, just any one will do. Similar to longitude and latitude, I casually say a longitude and latitude, as long as it's within the range, then this coordinate must exist on Earth."

"That's true." Liu Feng recognized:

"If you want to know the coordinates of a certain time-space at will, then we only need to find the arrangement, naming, and combination rules of space-time coordinates. As long as you know the rules and the range, you can make up a coordinate number, and this time-space will definitely exist, similar to longitude and latitude."

"For example, I'll casually say, 22 degrees south latitude, 43 degrees west longitude. What country or city is this? Lin Xian, do you know?"

Lin Xian shook his head:

"I don't know, but it must exist on Earth."

Liu Feng ran to another experimental table, took out a globe, turned it halfway, and pointed to the location of South America:

"Found it, Brazil, Rio de Janeiro."

"So do you understand now? If your purpose is to only describe any space-time coordinates, then you only need to understand the definition form, rules, and numerical range of space-time coordinates."

"I know this principle, you don't need to popularize it for me."

Lin Xian spread his hands:

"So, what should we do? How can we know the definition rules of space-time coordinates?"

Hmph~

Liu Feng smiled evilly, walked back to the experimental table, and patted the space-time clock that still showed 0.0000000:

"I think this space-time clock may be able to help you!"

"Because its function is to test space-time curvature, just like every longitude and latitude will correspond to a certain location on Earth…"

"【Every space-time curvature may correspond to a specific time-space!】"

……

Lin Xian turned around and looked at the space-time clock that he had never been very optimistic about:

"Your statement is not rigorous, right? If any seven decimal places after the decimal point represent a space-time coordinate, can't we just make it up? For example, 0.1234567? Does this count as a space-time coordinate?"

"I'm not sure." Liu Feng shook his head rigorously:

"Maybe it is, maybe it isn't. Because we don't know what the rules of space-time curvature are, what number of decimal places, and what the minimum value is."

"But I think it should be a good idea to calculate and analyze space-time coordinates through space-time curvature. So… are you in a hurry to know the answer? If you're not in a hurry, why don't you wait until the numbers on the space-time clock change someday?"

Lin Xian looked at Liu Feng.

He didn't say anything.

He slowly breathed a sigh of relief from his nose…

Anxious.

How should he put it?

He was definitely anxious. He couldn't wait to answer the Genius Club's three exam questions correctly and then go to the Genius Club meeting.

But obviously, he couldn't rush this kind of thing.

Because he only had one chance to try and make mistakes, he had to ensure that everything was foolproof.

"Are there any other ways?"

Lin Xian rubbed his chin and thought:

"I can't trouble the Oriole again, can I?"

The one who tied the bell must untie it. The Oriole gave him a hint about the mirror riddle, and maybe she could give him some hints about space-time coordinates.

But…

Thinking of the Oriole being strangled by an invisible force in front of him that day, being devoured by the laws of time and space, and becoming transparent and painful all over…

"Forget it, Liu Feng, we'll solve this problem ourselves."

Lin Xian raised his head:

"We can't trouble the Oriole