Walking on the edge of Dianchi Lake, there is a pungent smell blowing in the face, looking at it from a distance, the water surface shows a turquoise color, and it is difficult to see fish and shrimp in the water again.

Although the government has invested tens of billions of yuan in governance, the effect is still not ideal, and if it were not for the annual visit of red-headed gulls from Siberia, many people would no longer want to visit here.

At this time, the red-headed gull had already left, and Duan Pingsi regretted that he had set the date here.

"I'm sorry to show you the green algae!" He smiled awkwardly.

"What's there, it's better than being stuffy in the city."

Liu Jiaying's voice was particularly good, and Duan Pingsi felt like hearing the birds chirping in the morning.

Today, she deliberately changed into a pair of skinny jeans and wore a white shirt on her upper body, which perfectly showed off her bumpy figure.

"You look good today!"

Duan Pingsi couldn't help but praise that after a few months of getting along with Professor A, Zhang Yu, Zhang Yuhang and others, he was no longer the very shy little boy he was at the beginning.

Since returning from Jade Dragon Snow Mountain, he has locked himself in the laboratory most of the time, on the one hand, to take responsibility for his own safety, and on the other hand, he is about to write his undergraduate graduation thesis.

He suddenly thought of some questions and wanted to talk to Liu Jiaying, but he was afraid that the other party would not want to see him, so he finally mustered up the courage to dial her after hesitating.

Liu Jiaying on the phone seemed very happy, and she agreed to the invitation very happily, which surprised him very much, because he thought that he would always be just an ugly duckling, but Liu Jiaying was a beautiful swan, and the two should not have anything to do with each other.

"Thank you! No one has ever praised me so directly! ”

In front of outsiders, Liu Jiaying always keeps a smile like a flower, as if she has endless happiness.

"yes, then I'm honored to be the first!"

Duan Ping tried his best to be generous, but he didn't know where to put his hands, he looked obscene when he carried it, and he looked arrogant when he held it.

"Huh!"

Liu Jiaying smiled, quietly glanced at the boy next to him, and found that he was not handsome but his face was very delicate, and his facial features were not delicate but very upright.

"Why do you talk so gently, you don't look like a science student at all!"

Duan Pingsi smiled, "I don't usually do this, but I don't know how to praise a girl to be happy." ”

"Haha! Ha ha! ”

Liu Jiaying smiled even more happily, her cheeks turned crimson, "You don't need to praise, the girls are already very happy, I didn't expect you to have such a cold and humorous side!" ”

"No, it's not humor, I'm just a little silly." Duan Ping said.

"If you're stupid, I'm stupid."

Liu Jiaying felt that she was becoming more and more interested in this silly boy, she sat down on the wooden chair next to her to the right, and motioned for Duan Pingsi to sit on her left.

"Say it!" Liu Jiaying stared at a pair of big eyes, "Is it just to ask me out just to praise me for my good looks?" ”

Duan Ping pulled his coat, then sat down about thirty centimeters away from Liu Jiaying, pointed to the blue sky, and said slowly:

"I just want to ask you, from the perspective of historical development, will mankind fly into space in the future?"

"Ugh!" Liu Jiaying was stunned for a moment, "Why did you suddenly ask such a serious question?" ”

Duan Pingsi glanced at her and said seriously: "Recently, I am writing my graduation thesis, and I want to try to discuss the question of human evolution and development direction, you know that I am a life science major. ”

It is true to write a graduation thesis, but the most important thing is that I am really confused in this regard, Liu Jiaying at this time did not know about the existence of aliens, and Duan Pingsi didn't want to tell her immediately.

Liu Jiaying nodded, "I think it will, flying into space is inevitable in the development of history, but this process must be tortuous and circuitous, and it cannot be smooth sailing." ”

"Why?" Duan Pingsi asked.

Liu Jiaying held the fingers of her left hand with her right hand and talked eloquently: "First, human desires are endless, when human beings are still wandering in nature, they will only think about how to get enough food, and being full at that time is the greatest happiness.

When mankind entered the agricultural revolution, it became easier to eat and drink, so people began to pay attention to spiritual enjoyment, if you can enjoy a little music after tea and dinner, it is a human being.

Later, the industrial revolution and the information revolution occurred in human society, and people's requirements for the quality of life became higher and higher, and simple eating and dressing well have become less and less able to meet the needs of human beings.

Under the premise that the earth's invention and creativity have reached the extreme, if there is another revolution, what will mankind pursue? I guess there's just space tourism and interstellar exploration. ”

Duan Pingsi clapped his hands and shouted, "Yes, after human beings reach the limit of their pursuit on the earth, they will definitely stretch out their hands to space to ask for it." ”

Liu Jiaying's statement Duan Pingsi also thought about it, just like his dream when he was a child was just to be able to eat a bag of instant noodles every day, but now his dream is not so simple.

"The second point," Liu Jiaying said, getting up from her chair, "the earth's resources are limited, and when the number of people reaches a certain level and the life span of people is long enough, the problem of resource shortage will explode in an all-round way.

Even if the number of human beings decreases a little, but the life span of the earth and the sun is so long, human beings will eventually exhaust their resources, and then they will only have to ask for space. ”

Duan Pingsi also got up from the chair and walked around Liu Jiaying, constantly thinking about her words in her heart, and Liu Jiaying continued:

"Another point, if there are aliens and they have the same problems as us, then they will definitely fly into space, and if the earth is unfortunate enough to become a suitable place for them to live, then we humans will suffer, and there is only one way to deal with them."

"What's the solution?" Duan Pingsi asked.

Liu Jiaying smiled slightly, "Of course it's flying into space, if humans don't have the ability to do this, even if they can deal with one or two aliens, they will definitely not be able to deal with all aliens." ”

"You are so good, you can tell so many truths at once, and the logic is much stronger than that of me, a science student."

Duan Pingsi was indeed surprised by Liu Jiaying's knowledge and thinking ability, she could associate "unreachable" aliens from simple truths, which was very rare.

"Do you believe in aliens?" Liu Jiaying asked suddenly.

"Ahh Duan Pingsi didn't know how to answer, and then remembered the confidentiality agreement that Zhang Yuhang forced them to write down, so he had to say lightly: "I hope it doesn't, it's not something to mess with!" ”