The construction of "Earth Era" consumes 2.07% of the GDP of all mankind every year, and the total cost has reached 159 trillion federal coins over the years!

This is an extremely huge number, and after a long time, ordinary people certainly do not want to.

To know...... Many people on the earth are still eating dirt!

Li Cheng sighed again: "The Deep Space Foundation still has to prepare at least a trillion yuan of funds to pave a path of light for the 'Earth Era'. ”

"In the next 20 years, at least a large amount of nuclear fuel will be harvested at the Jupiter industrial site, and its fusion energy will be used to launch long-range laser ......"

Zhang Yuan nodded, thoughtful in his heart.

Earth Age, which uses a dual propulsion mode of light sail and nuclear fusion propulsion.

Light sail refers to the light pressure push. When a photon hits a smooth plane, it can change the direction of motion like a ping-pong ball bouncing off a wall, and propelle the spacecraft by applying a corresponding force to the impacting object.

However, the light compaction of the sunlight was too small to quickly propel a mega-ship of 10 million tons. Only large artificial light sources from the Moon and the base of Jupiter can generate enough pressure to propel it.

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

In addition, this optical path needs to be continuously emitted for 20 years, and there are hundreds of thousands of laser emitting devices, and they have to be continuously replaced, which is a huge amount of money.

It is hard to imagine how Professor Qi Yuanshan, the "father of nuclear fusion", persuaded those shrewd businessmen and scheming politicians in the first place.

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

Even for hundreds of years, thousands of years, it is impossible to generate any benefits.

This is very strange.

After chatting for a while, Li Cheng also felt a little boring to talk about these things with juniors: "Whether there is enough capital budget or not is a problem that the boss above should consider, and you don't have to worry about it." It's enough to be your own. ”

He shook his head, as if he had thought of something, and stopped eating. He got up from the table, went into his study, and thought to himself.

Although Zhang Yuan was very curious about the gossip in this regard, he could only give up when he saw this scene.

After eating, Zhang Yuan complained in private: "Your dad and my dad are really similar, it's a workaholic." Suddenly I had some inspiration, and then I got myself up and was busy documenting. Don't disturb him at this time, otherwise you will be angry, or something inexplicable. ”

"That's right!"

Li Zhendong agreed: "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 about Piano's axioms, I was still in kindergarten at that time." I simply doubt he has common sense! ”

"Has your sister ever been educated like this?"

"Yes."

Li Zhendong said exaggeratedly: "Once, my sister asked him why the area of the rectangle is long by wide, and he directly talked about some things that I don't know about European-style space, inner product, etc. Fortunately, my mother is a normal person, otherwise she would have to be brain-dead by him. ”

Zhang Yuan also laughed, and then recalled his father's weird style.

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

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

"It's just math from 500 years ago, it's very simple. Once you learn this, the little ones will be impressed! ”

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

“…… The group formed by all operations is called the Rubik's Cube group. Obviously, the Rubik's Cube group is a non-abelian group...... If it can be decomposed into the product of simpler subgroups, and then the generators of each subgroup can be constructed, its solvability can be proved. It has been proven that all Rubik's cubes can be restored in less than 20 steps. ”

In this process, Zhang Qiming's eyebrows danced and he fully enjoyed the pleasure of being a teacher.

But eventually, he found his son, who seemed to be staring blankly at him, unable to understand.

Do not understand?

Zhang Qiming burst out of his mouth with a foul sentence: "What a ...... Stupid! ”

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

Zhang Yuan sighed, these past events, recalling not the kind of resistance at that time, but quite nostalgic.

It's been 3 years since my father died, right?

Time flies so fast, as soon as you open your eyes, as soon as you close your eyes, 3 years have passed, the deceased is gone, and all that is left is nostalgia.

Seeing that Zhang Yuan was not in a good mood, Li Zhendong turned on the TV and tuned to the children's channel, where a cartoon was playing - "Wolves Infested Bears Become Sheep".

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

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

Zhang Yuan asked again: "You're gone, aren't your parents distressed?" ”

"Don't feel distressed, don't you have a sister?" He pointed to a teenage girl next to him, and said heartlessly, "It's okay to have a few more in the future." Anyway, now that science and technology are developed, you can afford to give birth to it casually. ”

He continued: "Think about it, if I don't get on the spacecraft and stay on the moon to work. Go home once a year for the Spring Festival, for three days each time, and accompany them for two hours a day...... In 60 years, the time spent with me is only 360 hours......"

"Now, I stay at home every day to eat and drink, accompany them for seven or eight hours a day, a month adds up to more than two hundred hours, and the whole holiday has spent most of my life together, what else do I regret?"

Zhang Yuan scratched his head, what kind of bullshit logic is this?

However, it sounds like there is some truth to it......

Mother Li smiled and cut a little fruit for them, as if she was used to Li Zhendong's neurotic remarks, "Zhang Yuan, don't go back today, stay in our house, there are still empty rooms anyway." ”

"Hmm."

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 well.

And he Zhang Yuan is a product of IVF, the sperm is provided by his father, and the eggs are from an unknown female donor in the human gene pool. Until now, he didn't know who his blood mother really was, and there was no need to know......

But who doesn't love having a kind and kind mother?

When they were in college, their grades were about the same. However, Li Zhendong is a god of learning, playing around, and the exam still scored more than 90 points; And Zhang Yuan is just a top student, and he needs to put in more effort to get good grades.

It's actually an intellectual gap......

But that's okay!

Thinking so, Zhang Yuan took out his mobile phone and began to brush the "Super Brain" APP. A strange sense of happiness rose through my mind when I saw those mathematical symbols.

There is no need to envy others, learning makes me happy, learning makes me grow!

As long as I can learn, I have the whole world!