Although Lin Xian had some doubts about the historical truth that Grandpa Wei Shengjin was talking about.

But for now, at least one thing is certain.

The fourth dream realm had completely disappeared.

Many things had completely changed.

The mysterious old man was gone, and the so-called Time-Space Police Department and Time-Space Court should be gone as well. It was conceivable that his unwarranted charges must also be gone.

In any case.

Lin Xian felt much relieved to have changed from a historical sinner back to an innocent and law-abiding citizen.

With this analysis, it was not difficult to guess that

The mysterious old man in the fourth dream realm was most likely Copernicus himself.

He ultimately stole Just Coke's entangled space-time particle. This space-time particle should have helped him a lot. Perhaps it wasn't just about sending back time-travelers. Copernicus should have discovered more secrets from that entangled space-time particle, so he was able to control more space-time laws and establish the Time-Space Court and Time-Space Police Department under his control.

But at the moment Just Coke destroyed the entangled space-time particle.

Copernicus's future disappeared.

His centuries-long plan also failed because of this, and the future was heading towards the future that Just Coke had hoped for.

"So,"

Lin Xian thought to himself:

"The 0.0000000 world line should be the future that Copernicus hoped to achieve."

"And the 0.0000042 world line should be the future that Just Coke hoped to achieve."

What about the previous ones?

Because before the fourth dream realm, Liu Feng's space-time clock hadn't been zeroed and calibrated, so it couldn't detect the space-time curvature of the previous dream realms and world lines.

But even if he didn't know their space-time curvature, it didn't prevent them from being different world lines that actually existed.

The first, second, and third dream realms, whose future did they hope for and who created them?

"That's not right."

Lin Xian suddenly realized.

The fuse and culprit for these changes in the future world was actually himself!

Although he wasn't the mastermind behind the scenes.

But the reason why these future worlds changed was actually related to his actions.

The first dream realm remained unchanged for 23 years. Starting with a small Rhine cat, he pried the gears of space-time and was ultimately pushed to another world line by Professor Xu Yun's hibernation capsule filling liquid, arriving at the future of the second dream realm.

The second dream realm jumped to the third dream realm because he founded Rhine Company.

The third dream realm jumped to the fourth dream realm because he gave the cold fusion manuscript to Gao Yan of the Dragon Academy of Sciences.

The fourth dream realm jumped to the fifth dream realm because Just Coke destroyed the entangled space-time particle. Although the person who directly took action was not Lin Xian, it was also triggered by him as a fuse.

"It's just that the current me can only act as a fuse, but I don't have the ability to actively change the world like Copernicus and Just Coke."

Lin Xian realized that this was his biggest shortcoming at the moment.

Just Coke had a plan to immigrate to Mars, and he also had the ability to do it.

Copernicus had a plan for the Time-Space Police Department and the Time-Space Court, and he also had the ability to complete it.

Looking back at himself.

First, he didn't have a clear plan, and second, he didn't have enough ability.

Then the next step.

Should start from these two points, gradually achieve the future he hoped for, and complete his closed loop!

"Of course, the prerequisite is to join the Genius Club first, see what the ultimate goal of this group of people is, and then I can formulate my own plan and plan my future."

"As for the matter of developing my own power, it is indeed necessary to put it on the agenda, and make Rhine Company bigger and stronger!"

This was the current situation.

Although he didn't get any particularly useful information from Grandpa Wei Shengjin, at least the changes in the world development of the fifth dream realm gave Lin Xian a new understanding of the relationship between space-time, the future, and closed loops.

However, let's consider this kind of thing after leaving the dream realm.

The current fifth dream realm was still mysterious to him and needed to be explored carefully.

Lin Xian lowered his head.

Looking at the device in Grandpa Wei Shengjin's hand that looked like a metal detector:

"Is the metal detector in your hand used to find the hafnium alloy safe?"

"Yes."

Grandpa Wei Shengjin nodded:

"This is a long story. I started hibernating when I was a teenager and hibernated for more than 200 years. I don't remember anything after waking up. Even if there is a memory notebook and memory video, and I believe these memories are real, I ultimately don't have any sense of reality and can't feel any of my previous existence."

"I did start a new life on Mars quickly under the guidance of a psychological counselor. In this way, I worked, got married, had children, and grandchildren, and came step by step. I spent my second life very happily and happily."

"At first, I didn't feel any sense of gain or loss. After all, life was really happy. It's just that from the moment I was told my name was Wei Shengjin, I lived as Wei Shengjin, but I wasn't the Wei Shengjin who used to be on Earth, the little boy who was a teenager."

"I don't know if you can empathize. As a human being on Earth, Wei Shengjin, the little boy who was a teenager, disappeared the moment I went to sleep in the hibernation pod. I often think..."

"Is the person who woke up from hibernation more than 200 years later really the original Wei Shengjin? Or is it just someone else who was told to be Wei Shengjin? Am I really Wei Shengjin? Am I really still the teenager who went to sleep in the hibernation pod?"

Speaking of this.

Wei Shengjin paused, with a somewhat bewildered expression:

"It's hard for me to describe this feeling to you in words. It's nothing if you don't think about it carefully. Anyway, people are not creatures who live in the past. As long as the present is happy and free, it doesn't seem to matter what kind of person you were in the past."

"But once I am free and my brain relaxes, I can't help but think about this question. It's hard for me to convince myself. Especially now that I am seventy years old, I am even more confused and want to know the answer..."

"I don't want to leave this world without knowing who I am."

Saying that, Wei Shengjin took off the big backpack behind him and opened it.

Lin Xian found that it contained all kinds of outdoor equipment, survival tools, food, notebooks, and things like power supplies...

Grandpa Wei Shengjin rummaged for a while and found a laminated photo, handing it to Lin Xian.

Lin Xian took it and held it in front of his eyes.

This looked like a very new photo, with no traces of time. But according to Grandpa Wei Shengjin's previous statement, this photo should have been taken not long before hibernation.

Because

The scene in the photo was the interior of the Time Bank warehouse, which was three safes in the middle of a row of hafnium alloy safes, close together.

The hafnium alloy safe in the middle had the number 724 written on it, and Wei Shengjin's name was engraved on the nameplate.

The safe on the left had an English name, number 723; only half of the safe on the right was photographed, number 725, and the text on the nameplate looked like Russian but not quite, so Lin Xian couldn't be sure.

The focus of this photo was obviously on the password dial of Wei Shengjin's safe.

Eight password dials combine to form a password.

23730907.

"Grandpa Wei, is this your birthday?"

Wei Shengjin smiled and shook his head:

"No, even the teenager me wouldn't be stupid enough to use my birthday as the password for such an important safe, right? That's too insecure."

"Then what is this date?"

Lin Xian remembered that Grandpa Wei Shengjin had just said that he was born in 2373.

Since this date wasn't his birthday

What else could it be?

"Is it a festival that has special significance to you?" Lin Xian continued to ask.

"I don't know."

Grandpa Wei Shengjin shook his head again:

"I don't know anything. After waking up from hibernation, I lost all my memories of my youth. My ID shows that my date of birth is January 3, 2373, which is very different from the safe's password, September 7. There must be no relationship."

"But then again, why would the teenager me back then set the safe password to this? I have the same idea as you. There must be something very special about it, right? For a teenager who is about to go to sleep in a hibernation pod and go to an unknown future, what would he put in this time capsule? What would he leave for his future self?"

Grandpa Wei Shengjin lowered his head and smiled:

"After retiring, my grandson also grew up quickly and didn't need to be taken care of anymore. My son's life was also very happy, and my wife also left me a few years ago. I was busy for a lifetime, and after a long absence, I became idle, so I couldn't help but think about the original question again."

"Every night, I sit in the yard and look at the stars, holding this photo and imagining what the young me would put in this time capsule."

"I really want to know the answer, and I want to personally enter the password, open the seal of time, and see for myself. But this dream is destined to be impossible to realize. The super disaster in 2400 did not directly affect Donghai City, but the subsequent earthquakes, wars, and abandonment gradually leveled and collapsed the city over the years and buried it under the soil."

"Naturally, the hafnium alloy safes in Time Bank also disappeared in those years of war and destruction; they may have been buried with the city, or they may have been stolen, or they may have been destroyed. In short, they can't be found, not to mention that Earth has long been abandoned and reduced to a large wildlife park."

"But in the end, I still decided to come! I want to find the answer! I want to see what precious memories the teenage me left for the old me in the future."

Wei Shengjin smiled and raised the metal detector in his left hand:

"So I came, and I finally took the first step to find myself at the age of seventy. More than half a year ago, I took the Earth-Mars space bus from Mars to Earth. After a voyage of several months, I finally arrived on Earth, and then came to the place where Donghai City used to be, which is this forest, and started searching aimlessly."

"I have been looking for more than two months, but I haven't found anything. Not to mention finding my safe number 724, I haven't found any other safe."

Lin Xian spread his hands helplessly:

"It's really too difficult to find, it's like looking for a needle in a haystack. Even if those safes are buried in the forest? If the safes are buried deep, I guess they won't be detected."

Wei Shengjin chuckled:

"I understand the reasons you mentioned, otherwise why would I have been procrastinating and hesitating until I was 70 years old before coming to Earth?"

"I have been thinking about this for so many years, and I clearly know how difficult this matter is and how slim the hope is. But I am so old, and this is my last thought. In order not to leave regrets in my life, I will try it!"

"The worst result is that I can't find it. If I can't find it, I will just treat it as a trip to Earth. Anyway, the Earth-Mars space bus will arrive in two years. At worst, I will take the bus back to Mars in disgrace."

At this point, the origin of Grandpa Wei Shengjin was clarified.

He came to Earth from Mars specifically to find the hafnium alloy safe that belonged to him.

Fortunately.

Lin Xian was also very curious about what information Chu Anqing wrote to him on the small note in his hafnium alloy safe.

Chu Anqing said that he would be able to understand the truth of the dream world the moment he saw the contents of the small note.

Even if the changes in the fifth dream realm now could most likely prove that the dream world was real.

But.

Lin Xian still wanted to know

As a thousand-year pile that touched the space-time particle, what words would Chu Anqing write to him in the last few tens of minutes of her life?

It must be very important information, right?

This was a clue she left for him with her last life, perhaps even more important than he imagined.

"Then let's look for it together, Grandpa Wei."

Lin Xian said:

"I also want to know what is hidden in my safe, let me follow you and try my luck."

"Of course, no problem." Grandpa Wei Shengjin laughed heartily:

"Your name is Lin Xian, right? Then I will call you Lin Xian from now on, and you don't have to be so polite and call me Grandpa. After all, you were born much earlier than me. This phenomenon is very common in today's society, so everyone has long stopped using this title. You can just call me by my name, Wei Shengjin."

"No, no, no..."

Lin Xian shook his head and refused, insisting:

"I still call you Grandpa Wei, after all, this is Earth, let's talk about Earth generations and respect tradition."

The name Wei Shengjin was really thunderous.

Forgive Lin Xian for not having the cultivation to say it casually.

Thus.

The two formed a team.

They chatted while walking along Wei Shengjin's established route.

Lin Xian didn't have any hope of finding the safe. He knew in his heart that the probability of finding a needle in a haystack was impossible.

It's just that, he finally found a living person who could talk, Lin Xian couldn't let him go, right?

He must try to get as much information as possible.

Wei Shengjin skillfully held the metal detector and moved it left and right close to the ground, very seriously.

Lin Xian followed behind Wei Shengjin like a tag-along, asking questions:

"Grandpa Wei, are you in such good health because you have also undergone drug strengthening and gene editing?"

"Hehe, there is no such thing." Grandpa Wei Shengjin was amused:

"Those are all concepts in science fiction, they don't exist on Mars."

Okay.

It seemed that the technology tree had changed.

Lin Xian chuckled.

Could it be that the two blue-eyed female assassin killers brought some psychological shadow to Just Coke?

As a result, he was very resistant to drug strengthening and gene editing, so naturally, he would not develop this technology on his Mars.

That's right.

That was Just Coke's Mars, and he must have the final say.

"Since you haven't had your body strengthened, give me your backpack, and I will carry it for you."

Lin Xian always respected the old and loved the young:

"I will save you some energy and increase the speed at which you detect metal reactions underground. I am younger than you, so I must have better physical strength."

"Hehe, then thank you, Lin Xian. This backpack is really heavy, it's pressing my waist."

Grandpa Wei Shengjin was not polite.

He directly put down the big backpack on the spot and let Lin Xian carry it on his shoulders.

It was indeed heavy, but acceptable.

Lin Xian himself had good physical strength, and he had been undergoing devil training at the astronaut secret training center a few months ago, so his physical fitness was even better.

Putting on the backpack, Lin Xian continued to ask about things on Mars.

Economics, politics, the overall situation, technology, he learned a lot.

Overall.

According to Wei Shengjin, life on Mars was still very pleasant, without so much pressure and no wars.

The root cause was that although Mars implemented a federal system, it was actually still Space T that dominated behind the scenes.

Space T's dominance did not rely on weapons and power, but on real technological skills.

The Mars immigration plan did not officially start until around 2350 and developed very slowly. At first, there were only a few small bases, and they still had to rely on supplies from Earth.

In 2400, the Earth disaster did not affect Mars at all, and under the leadership of Just Coke and Space T, Martian humans began to steadily build and develop.

This was not a simple matter.

Mars was much farther from the sun than Earth, which meant that Mars could only receive very limited solar energy.

As the saying goes, all things grow by the sun. Mars was inherently at a disadvantage in obtaining solar energy.

But compared to other difficulties in building Mars, the problem of sunlight was the most insignificant.

The Martian atmosphere was very thin, which could not block dangerous cosmic radiation and rays, and the air pressure was very low, which could not lock liquid water.

Mars did not have a magnetic field, which was the weakest link; the reason why life on Earth was so comfortable was because of the existence of the Earth's magnetic field, which deflected all solar storms and cosmic rays, preventing them from reaching the surface.

Similarly, the low gravity environment of Mars was also a major test of the human body's adaptability and long-term evolution.

In the next two hundred years, Martian humans had been fighting against these external factors.

They united as one, overcame thousands of difficulties, and finally developed Mars into a self-sufficient and well-fed living planet.

In other words, in 2350, the living standards on Mars were not as good as those on Earth in 2024.

Then from 2350 to 2550, Martian humans were building their homes, and technological development was basically stagnant, after all, the primary task was self-sufficient survival.

After 2550, after all the problems of food, safety, diet, and life were solved, Mars truly entered the stage of developing technology.

This was another bottleneck, resources and energy were all problems. Until today in 2624, the living standards and technological levels of Martian humans could only be said to have barely reached the level of Earth in 2200.

Lin Xian did not have any practical concept of this statement. Through conversations and comparisons with Wei Shengjin, he roughly judged that in this future, the technological level of Earth in 2200 was roughly the same as that of New Donghai City in the second dream realm.

High-density nuclear batteries were solved, but there was still some distance from controllable nuclear fusion.

Space T Company controlled all the lifelines of Mars and also determined the direction of Mars's development, holding absolute discourse power in the various federations.

When Just Coke passed away, there were a total of 200 million people on Mars, and now, the total population of Mars had exceeded 500 million.

Wei Shengjin also said:

"Why Martian humans are unwilling to come to Earth, there is actually another important reason, that is, the super disaster in 2400 was too scary, and no one knows when the next disaster will appear without warning."

"Therefore, everyone is afraid of Earth, and no one is willing to come for tourism, let alone live. The fact is that there was no sign of the super disaster in 2400 before it came, it just appeared very suddenly."

Lin Xian carried the heavy backpack and followed behind Wei Shengjin.

Another super disaster in 2400.

He did not think that this kind of disaster was naturally formed.

Because there had been no similar disasters in the previous four dream realms, at least not in the records.

If it was really a natural disaster.

Such as solar storms, internal Earth movements, or external meteorites...

Then the fifth dream realm had it, and the previous four dream realms must also have it.

It was impossible to say that the sun was very considerate in the first dream realm and did not erupt electromagnetic storms; then, when it suddenly got angry in the fifth dream realm, it erupted electromagnetic storms?

This was obviously impossible.

Earth did not have so much face, in front of the huge sun, Earth was just a small piece of garbage, not worth mentioning.

Therefore, the reason was self-evident.

This was also what Lin Xian had been suspecting all along.

The Earth super disaster in 2400 was most likely man-made. Although he did not know Just Coke's specific purpose, the so-called "historical education" on Mars should have lied and was not the real history.

Even

Why did humans give up Earth so easily? What hidden secrets were there? Lin Xian still insisted that, no matter what, Earth was more suitable for human survival than Mars. Could it be that letting humans abandon Earth and flee was itself a conspiracy?

Lin Xian followed behind and thought, not responding to Wei Shengjin's words.

Wei Shengjin walked in front.

While detecting, he chuckled:

"Hey, I think these people are a little worried. How easy is it to encounter that kind of global super disaster? How can it be so coincidental?"

"Don't you think so, Lin Xian? It can't be that Earth has been fine for more than two hundred years, and then as soon as we come, Earth will explode, right? Hahahahahaha..."

Grandpa Wei Shengjin laughed heartily.

Lin Xian also laughed heartily.

Yes, that's right, it's such a coincidence, Grandpa Wei!

Lin Xian lowered his head and looked at the watch on his left wrist.

16:41 in the afternoon.

There were only 8 hours left for Wei Shengjin to laugh and joke.

He suddenly thought.

If the white light that destroyed the world at 00:42 was simply destroying Earth, then would the humans on Mars be able to survive?

After thinking about it, Lin Xian felt that it was not realistic.

If the white light was indeed a weapon that destroyed Earth, then the destructive power and range of this light-speed strike must be very large.

It was impossible to say that Earth was evaporated, and Mars was fine, and the sun was fine.

Most likely, it would be a solar system that was destroyed, and no one could escape.

But then again.

What exactly was that white light?

Was Earth really destroyed?

Or was Earth fine, and he was kicked out of the time loop?

He really did not know when he would find the answer to the white light.

Beep beep beep beep beep!

Suddenly.

The metal detector in Wei Shengjin's hand made a loud and rapid sound.

"Found it?"

Lin Xian did not expect to find something, and quickly ran over.

Wei Shengjin slightly moved the metal detector to find the place with the strongest signal, and the beep beep beep beep beep sound was fixed there:

"This position..."

Grandpa Wei Shengjin definitely said.

Lin Xian thought of a question:

"Can your detector detect all metals? Since this is the ruins of Donghai City, there must be a lot of scrap iron, right?"

Grandpa Wei Shengjin shook his head:

"That kind of steel must have rusted and corroded a long time ago, and my machine can't detect that kind of rusted metal. This detector is very advanced, not the kind of security check type that identifies metal through electromagnetic induction."

"I won't explain the principle to you, anyway, my detector can only detect metal bodies with smooth surfaces, no rust, and complete structures."

"I came prepared for this trip. The hafnium alloy material is heat-resistant, corrosion-resistant, and will never rust. It will be absolutely accurate to use this detector to detect it!"

"What if it is a stainless steel basin?"

Lin Xian asked cautiously:

"Is it possible for a stainless steel basin to be detected?"

Wei Shengjin shook his head and smiled:

"Lin Xian, stainless steel materials are not absolutely rust-free. Even the best stainless steel materials can't last for decades outdoors, and rusting is inevitable. What's more, it has been 200 years, and the stainless steel has also rusted away."

"If you say it is newly produced stainless steel, that is even more of a fantasy. In this abandoned Earth, the level of industry is almost equal to zero, and it is absolutely impossible to manufacture stainless steel materials. I can responsibly say that there cannot be any stainless steel on this planet today."

Cautious!

Lin Xian couldn't help but give Wei Shengjin a thumbs up:

"Okay, Grandpa Wei, it can be seen that you really came prepared!"

"Okay, Lin Xian, take out the folding shovel from the backpack, let's dig the soil together and see..."

After exploring for two months, it was the first time to find something, and Grandpa Wei Shengjin was obviously very excited, rolling up his sleeves and preparing to dig.

Never mind!

If you can find the first one, you can find the second one!

Lin Xian took out two folding shovels from the backpack. They looked like they were made of high-grade materials and were more sturdy than expected after unfolding.

Martian technology, worthy of its name.

The two quickly took action, digging a hole shovel by shovel.

Unexpectedly, the thing was buried quite deep, and they had dug more than a meter deep, but they still had not dug it out.

Wei Shengjin wiped his sweat.

He climbed out of the dirt pit, took the metal detector, and climbed back in, scanning the bottom:

Beep beep beep beep beep!!!!

This time the sound was louder.

"That's right, Lin Xian, it's definitely right below..."

Lin Xian was also sweating profusely.

After all, the dream world was August 28, 2624, the hottest time of summer, and he was doing such heavy physical work.

"We need to enlarge this pit a little."

Lin Xian took the kettle handed over by Wei Shengjin, took a few gulps, wiped his mouth:

"Otherwise, the two of us won't be able to stand inside. We need enough space to dig it out."

Wei Shengjin nodded.

So the two stopped digging vertically and started widening horizontally.

Fortunately, Wei Shengjin's Martian technology shovel was sharp enough to cut through the soil like tofu, and it was not difficult to shovel the soil, so the two made progress quickly.

"It feels like archeology."

Lin Xian said while standing in the dirt pit.

During this time, he had been digging graves and archeology, and his social experience was too rich.

Click!

Lin Xian stepped on the shovel, and it was stuck halfway, bursting out a spark.

"It seems like we dug something."

Lin Xian picked up the shovel and looked at it, and found that there was a small gap in front. The metal that could cause a gap in this fire-tech must be hafnium alloy.

Sure enough.

The two dug along the stuck place and quickly dug out a corner of the hafnium alloy safe!

"Grandpa Wei, this is the thing, you really found it."

Lin Xian pointed to the source of all evil under his feet.

He recognized this thing that he had been fighting with for so long, even if it turned into ashes.

Success was at hand.

The two didn't even bother to wipe their sweat, doubled their speed, and dug hard, and finally stood up this shiny hafnium alloy safe that was hundreds of years old.

Throwing away the shovels, the two immediately gathered around and looked at the nameplate on the front.

Number: 1277

Name: Pang Ya

For a moment, two sighs.

"I went to this safe number to 1277."

Lin Xian complained:

"This Time Bank is really getting bigger and stronger."

He turned his head and looked at Wei Shengjin who was sitting on the ground tiredly:

"Grandpa Wei, when you deposit your safe, what is the maximum number? Oh, I'm sorry, I forgot you have amnesia."

Wei Shengjin said that after hibernation, he had no memories of the past at all, so naturally he would not remember the things when he deposited the safe, after all, he didn't even know what the password 23730907 meant, and didn't know why he wanted to set this date.

Lin Xian randomly dialed the eight password dials on the safe, just trying it out of boredom.

I have to say, the quality of this safe is really good, it is worthy of being a hafnium alloy, and the password dials are still so smooth and crisp.

After trying a few passwords and pressing the buckle, he couldn't open it, so Lin Xian gave up, turned his head and comforted him:

"It's okay, Grandpa Wei, although we spent so much effort to dig out the safe, it's not yours or mine, but this is not necessarily a bad thing."

"Think about it, you have been looking here for two months and haven't found one. Maybe the Time Bank is not in this forest at all. Donghai City is so big, you may not have a concept. I don't know how big a city is on your Mars, but Donghai City has an area of more than 6,000 square kilometers. At your scanning and detection speed, let alone two years, you won't be able to detect it in twenty years."

"Now it's good, you directly discovered the core area. Since you can find the first safe, there must be a second, third, or even we may be in the ruins of the former Time Bank. You should be happy."

Wei Shengjin turned his head in confusion and looked at Lin Xian:

"Are you comforting me, Lin Xian? Hahaha, you are overthinking it. At my age, how can I be discouraged by this little thing, hahaha. But thank you anyway, I was just too tired just now and couldn't speak for a while. After all, I am 70 years old, and my physical strength can't compare with you young people."

Wei Shengjin picked up the kettle, took a few gulps, and handed it to Lin Xian with a smile.

Seeing that this 70-year-old grandpa who was chasing his childhood dreams had a good attitude, Lin Xian was relieved, waved his hand and said that he was not thirsty.

Then he took a step forward, sat on the hafnium alloy safe he had just dug out, and looked into the depths of the forest with Wei Shengjin:

"Grandpa Wei, I still have some historical questions that I want to ask you."

"Hey, why are you always so polite, Lin Xian."

Wei Shengjin waved his hand:

"You really haven't adapted to this era, which makes me a little restrained. You really don't have to call me grandpa all the time. Just like I call you by your full name, just call me Wei Shengjin!"

"Uh..."

Lin Xian decided to skip the title and go straight to the topic:

"I want to ask two questions, the first question is..."

"Why in 2400, after the super disaster, did Just Coke come from Mars to pick up people, and everyone left without hesitation? Normally, even if Earth is broken, rotten, and full of rubble, the technology is backward and there is not enough food, are so many people really willing to leave their homes and go to Mars?"

Wei Shengjin sighed softly.

Slowly said:

"Look, this is the disadvantage of not receiving historical education. I am very puzzled how you passed the hibernation awakening common sense test? If you don't pass that test, you have to retake it. If you can't determine that you have the ability to integrate into the current society, you are not allowed to live freely in the future era."

"Historical education says that the situation on Earth was very bad at that time, not just the problem of war and not enough food. Even after decades, there were few people left in the world, but the natural environment has not improved, volcanoes, earthquakes, tsunamis... Lin Xian, you have not experienced that kind of terrifying scene, you definitely can't understand their thoughts."

"You look at those war scenes and disaster movies, who doesn't want to withdraw to a safe place when they encounter that kind of situation? And at that time, between 2400 and 2500 AD, the safest and most comfortable place was definitely Mars."

"After 2500 AD, the Earth's environment may have improved, but the Earth immigrants at that time either died of old age or settled on Mars. The new generation of Martian children and grandchildren are unwilling to go to the backward Earth. Do you want an old man like me to run back to Earth to hunt and survive and live a primitive life?"

"I definitely don't want to, and the Earth-Mars space bus has a bus every two years. Whoever really wants to return to Earth to live, no one has ever stopped them, they can come if they want to, it's personal freedom. It's just that it's difficult to go from luxury to frugality. Now life on Mars is obviously much happier than on Earth, no one will come."

"Unless one day, the technological level and living standards of Earth can reach half or even one-third of the level of Mars, then many people will probably be willing to live on Earth."

Lin Xian nodded.

Continued:

"That's right, this is the second question I want to ask..."

"You said before that in 2500, after the last batch of Martian immigration ships flew away, there were still millions or even tens of millions of people left on Earth. Now, after more than 100 years, with a certain degree of knowledge reserves, why hasn't it developed to the industrial civilization stage?"

Wei Shengjin screwed on the kettle lid.

Put it aside.

Continued to explain to Lin Xian:

"100 years is indeed a long time, enough to achieve technological leaps. But the premise is that the population must be concentrated enough, and knowledge and basic equipment can be continued."

"Space T's spacecraft spent decades to pick up all the Earth humans who were willing to leave Earth. Except for some stubborn people, most of the remaining people had various physical problems and could not take the spacecraft, could not adapt to the weightless environment, and could not travel in space for a long time."

"It is no exaggeration to say that those left behind are old, weak, sick, and disabled. Under this basic premise, the population is also very scattered, and they cannot truly unite. Being able to gather tens of thousands of people is considered a huge organization."

"But with a population of tens of thousands of people, there are old and young, what can they do in industrial development? It would be good to maintain the agricultural economy. So after more than 100 years of reproduction, it is a miracle that the total number of remaining people on Earth can exceed 30 million and develop to the medieval level of life."

"The technological explosion of civilization does come quickly, but no civilization can suddenly and without any accumulation of technological explosion. Every outbreak of the industrial revolution seems rapid, but it is actually the result of hundreds or even hundreds of years of accumulation."

"This accumulation is not only the accumulation of knowledge and basic equipment, but more importantly, the accumulation of talents and even geniuses. It is only geniuses who can truly promote historical development, and the population base is here, and it has only been more than 100 years and several generations, the probability of the emergence of geniuses is too small."

"You may not believe it, even after nearly a thousand years, the geniuses listed in the textbooks of children now are still Einstein, Newton, Gauss, these miracles of human civilization. In fact, there is a difference of more than a hundred years between Newton and Gauss; and a difference of more than a hundred years between Gauss and Einstein."

"However, I am still very optimistic about the future of Earth. Give Earth humans another one or two hundred years, and when their population goes up, it will definitely cause qualitative changes from quantitative changes, and easily enter the industrial age."

Lin Xian listened to Wei Shengjin's evaluation of history, humanities, and civilization, and felt that he had a lot of insights:

"You seem to know a lot. What kind of work did you do on Mars?"

"Hehe, before retiring, I was a teacher at a university."

"Oh oh, amazing!"

Lin Xian praised:

"Then I will call you Professor Wei in the future."

"Oh, I am not a professor, just an