The construction of the "Earth Age" consumes 2.07% of the total human GDP every year. Over the years, the total cost has reached 159 trillion federal coins!

This is an extremely huge number. After a long time, ordinary people certainly don’t want it.

You know... many people on Earth are still eating soil!

Li Cheng sighed again: "The Deep Space Foundation still needs to prepare at least one trillion levels of funds to pave a light path for the 'Earth Age'."

"In the next 20 years, Jupiter Industrial Base will collect at least a large amount of nuclear fuel, and its fusion energy will be used to launch long-range lasers..."

Zhang Yuan nodded, thinking in his heart.

The Earth Age adopts a dual push model driven by light sails and nuclear fusion.

A light sail refers to the push of light pressure. When a photon hits a smooth plane, it can change the direction of movement like a ping-pong ball that bounces back from the wall, and use corresponding force to push the impact object to advance the spacecraft.

However, the compaction of the sun's light is too small to quickly push giant spacecraft of tens of millions of tons. Only large artificial light sources from the moon and Jupiter's base can generate enough pressure to push it.

Think about it, although the nuclear fuel on Jupiter is inexhaustible, it still costs labor.

In addition, this optical path needs to be continuously emitted for 20 years, and there are hundreds of thousands of laser emission devices, and it needs to be replaced continuously. This is another huge amount of funds.

It is hard to imagine how Professor Qi Yuanshan, the "father of nuclear fusion", convinced those smart businessmen and scheming politicians at the beginning.

Deep space colonization, this super-large-scale project, has no benefits at all.

Even hundreds or thousands of years, no benefit can be generated.

This is very strange.

After chatting for a while, Li Cheng also felt that talking about these things with the younger generation was a bit boring: "Whether there is enough financial budget is a question that the boss above should consider, and you don't need to worry too much. It is enough to do your own."

He shook his head, as if he had thought of something, and stopped eating directly. He stood up from the dining table, walked into his study, and thought about what questions he had.

Although Zhang Yuan was very curious about gossip in this regard, he had to give up when he saw this scene.

After dinner, Zhang Yuan complained privately: "Your father and my father are really similar, they are just workaholics. Suddenly, they have some inspiration, and then they get excited and are busy recording. Don't disturb him at this time, otherwise they will be angry or inexplicable."

“That’s right!”

Li Zhendong agreed very much: "I remember when I was a child, I asked my father why 1+1=2, do you know what he said? He actually told me Piano's axiom. I was still in kindergarten at that time. I simply doubt whether he has common sense!"

"Have your sister been educated like this?"

"have."

Li Zhendong said exaggeratedly: "Once, my sister asked him why the rectangle area is long and wide. He directly talked about some European spaces, internal accumulation and other things that are unknown. Fortunately, my mother is a normal person, otherwise he would have to be crazy."

Zhang Yuan also laughed and recalled his father's strange style.

At that time, he was playing with a Rubik's Cube on the sofa. His father suddenly had a whim and talked about group theories with a seven or eight-year-old child righteously.

Yes, group theory, Gavaro spent the night writing the paper.

"It's just math five hundred years ago, it's very simple. If you learn this, the children will look at you with admiration!"

Zhang Yuan was so happy: "I want to learn, I want to learn!"

"...The group composed of all operations is called the Rubik's Cube group. Obviously, the Rubik's Cube group is a non-Abel group... If it can be broken down into a product of a simpler subgroup and then construct the generators of each subgroup, it can prove its solvability. It has been proved that all Rubik's Cubes can be restored within 20 steps."

During this process, Zhang Qiming was full of joy and fully enjoyed the pleasure of being a teacher.

But in the end, he discovered his son, and seemed to be staring at him blankly, unable to understand.

Can't understand?

Zhang Qiming said a swear word: "What a... stupid person!"

I don't know if I'm talking about my son or myself.

Zhang Yuan sighed. These past events are not as resistant as they were when they recalled, but they missed them quite much.

It has been three years since my father's death?

Time passes so quickly. When you open your eyes and close your eyes, three years will pass. The dead are gone, and only nostalgia is left behind.

Seeing that Zhang Yuan was in a bad mood, Li Zhendong turned on the TV and transferred to the Children's Channel. A cartoon "Wolf Invasion: Bear Bear Turns into Sheep" was being played on it.

"Don't look at me as a bear..."

It's a very childish cartoon, but the little girl next to her was very happy to watch.

Zhang Yuan asked again: "You are leaving, don't your parents feel sorry for you?"

"I don't feel sorry, isn't there a sister?" He pointed to a little girl in her teens next to him and said heartlessly, "It's okay to have a few more in the future. Anyway, technology is developed now, you can give birth to whatever you want and you can afford it."

He continued: "Think about it, if I don't get on the spaceship, I stay on the moon to work. I go home once a year during the Spring Festival, three days a day, and spend two hours a day... In total, 60 years, I will only spend 360 hours of companionship..."

"Now, I stay at home and eat and drink every day, accompanying them for seven or eight hours every day, and a month totals more than two hundred hours. The whole holiday has spent most of my life with me. What else is there to regret?"

Zhang Yuan scratched his head, what bullshit logic?

However, it sounds like something is right...

Mother Li smiled and cut some fruit for them. She seemed to have become accustomed to Li Zhendong's neurotic remarks, "Zhang Yuan, don't go back today. Stay in our house. Anyway, there are still free rooms."

"Um."

Zhang Yuan nodded and sighed in his heart.

Li Zhendong's situation is very similar to himself, but the difference is that his parents are alive and his family is happy.

Zhang Yuan is the product of IVF, the sperm is provided by his father, and the egg comes from an unknown female donor in the human gene bank. Until now, he doesn’t know who his blood mother is, and there is no need to know...

But who doesn't like to have a kind and kind mother?

When they were in college, the two had similar grades. However, Li Zhendong was a scholar and was still more than 90 points in the exam; while Zhang Yuan was just a scholar and needed to put in more effort to get good grades.

This is actually an intellectual gap...

But it doesn't matter!

Just thinking about this, Zhang Yuan took out his mobile phone and started to browse the "Super Brain" app. When he saw those mathematical symbols, a strange sense of happiness rose from his mind.

There is no need to envy others. Learning makes me happy, and learning makes me grow!
Chapter completed!