Starting as a Wallfacer, his defection to the Three-Body Problem shocked the world.

Crisis Era 12, 2019 AD.

Nine years have passed since Lin Xuan became a Wallfacer.

However, because he was injected with RX cell division and regeneration fluid, his age was fixed at twenty years old.

People say that 23 is the last shining moment in a person's life, because from the age of 23 onwards, intelligence and physical strength will decline significantly.

Therefore, many people choose to take the civil service exam or the postgraduate entrance exam at this age, giving it their all in the final push of their lives.

"Time flies! In the blink of an eye, I've been a Wallfacer for almost 10 years," Lin Xuan exclaimed.

"Indeed, you've already extended your studies by four years. If it were someone else, they would have almost finished their master's degree by now."

Liu Chang, who was standing to the side, couldn't help but tease.

"It's not because of you!"

Lin Xuan rolled her eyes at Liu Chang speechlessly, while the latter just smiled.

"How can you blame me? I even helped you apply for repeating a year. You should thank me, otherwise your student status would have been lost long ago."

"Thank you and your whole family!"

"Tch, it's clearly your own fault for not passing the exam. If you didn't pass, then study hard. Keep it up, I believe you'll graduate smoothly one day."

Lin Xuan ignored him.

He actually took the final exam at the University of Chinese Academy of Sciences last year, since constantly delaying graduation isn't a good thing.

And guess what? That old bastard Liu Chang started targeting him!

"Please prove the Grand Unified Theory of the Universe."

Opening Lightning Strike!

Lin Xuan's test paper only had this one question, but...

This is something even the Trisolarans couldn't do.

Lin Xuan initially thought that Liu Chang would only mess with her in math and physics problems, but when she got the English questions, she was completely dumbfounded.

"Based on the grammatical rules of English, create a language with a similar structure, requiring that it cannot have any words repeated from the 5651 known languages."

Exams? Exams my ass!

At this moment, Zhang Xiang came out of the kitchen carrying a plate of food. As the handover officer for the Wallfacers, he was now like a nanny, responsible for cooking for the group every day.

His age hasn't changed much, not because of Lin Xuan, but because of Liu Chang.

Previously, PDC had been trying to reverse engineer the formula of the RX cell division and regeneration fluid that Lin Xuan had, but unexpectedly, Liu Chang got it first.

Although the effect is not as terrifying as Lin Xuan's, it can still extend the lifespan of ordinary people to around 300 years.

After learning about it, PDC bought the formula from Liu Chang. Lin Xuan didn't know exactly how much it cost.

However, since that day, the University of Chinese Academy of Sciences has become the second university, after Harbin Institute of Technology, to possess the capability to build spacecraft.

To be fair, Liu Chang, that old man, is sometimes really amazing. The clones he creates are now indistinguishable from real people.

To prevent these clones from being confused with the real people in the future, Liu Chang stuck to his usual practice and made all of them bald Wu Ke.

Lin Xuan joked at the time, "When you do this, don't you ever think about what will happen if you become bald one day? Will we treat you like a clone?"

"So I prepared a second verification method."

As Liu Chang spoke, he turned to the clone beside him.

“Experimental subject X412, tell me the definition of the word ‘I’.”

Upon hearing Liu Chang's question, the clone was taken aback at first, then shook his head, indicating that he did not know or could not answer the question.

"How did you do that?" Lin Xuan asked in surprise.

"Good question, I'd like to know too." Liu Chang rubbed his head.

"I don't really understand what the consciousness level is exactly. It's a bug, just like I guessed before. Even if I don't erase their self-awareness, their definition of the concept of 'I' still incomprehensible."

"but……"

As Liu Chang spoke, he took a sip of goji berry tea from his thermos.

"But we should also look on the bright side. At least this means that these clones won't be lost in the crowd in the future."

The Thinker array, originally consisting of 32 clones underground, has now expanded to 1024 people.

The number 1024 holds a special significance for computer programmers.

"It's a pity that Dr. Ding Yi and Dr. Wang Miao are not here. They can only see this table of delicious food on their WeChat Moments."

Zhang Xiang happily took a picture of all the dishes he had prepared with his phone and then shared it to his WeChat Moments with one click.

After hesitating for a moment, he deleted the post on his WeChat Moments, edited it again, and blocked Ding Yi and Wang Miao.

Just when Lin Xuan thought the guy had a change of heart, she saw him edit a post on his phone that was only visible to Ding Yi and Wang Miao, and set the posting time to 5 a.m.

Zhang Xiang: @Ding Yi @Wang Miao: You're still awake at this hour? Time to get up and have a midnight snack.

Lin Xuan: 6!

He underestimated Zhang Xiang's inhuman depravity. He thought Zhang Xiang had a change of heart, but it turned out to be poisoning people's minds late at night, and he even tagged them.

Dr. Ding Yi and Wang Miao recently went to Reach, so neither of them is at the Red Coast Base.

Wang Miao was responsible for building the synchronous orbit defense system for the Zhiyuan Star.

After more than a year, humanity has basically mastered the methods of building structures in space, and the next step is to begin exploring this vast cosmos.

Lin Xuan's initial plan was to build a lunar base on the moon, and then connect the Reach Star and the moon, constructing a dock in mid-air so that the subsequent fleet could use it as a docking point to repair and maintain its equipment.

As a result, Ding Yi's controlled nuclear fusion technology made rapid progress with Shi Qiang's previous guidance.

Ding Yi abandoned all the empirical foundations of physics and completely overturned and reorganized the controlled nuclear fusion technology from scratch, ultimately obtaining a new object—the nuclear fusion reactor.

This thing is far more energy efficient than the previous device.

Of course, this also means that this thing will never be usable on Earth.

Because if an explosion were to occur, the destruction of the entire Earth would be catastrophic.

So Ding Yi moved his laboratory to a geostationary orbit and, while Wang Miao was working on the defense facilities for the Reach Star, conveniently installed his nuclear reactor in outer space.

The two technologies that were originally unrelated were now integrated. The reactor solved Wang Miao's problem of powering the space buildings, allowing those big iron lumps to operate effortlessly in space.

Humanity's technological level has also made a qualitative leap after the breakthrough in controlled nuclear fusion technology, but the sophon is still there, and the upper limit of technology is almost locked. However, everyone is still full of confidence in the future.

From this moment on, humanity will officially begin its own space age!