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As soon as Chen Nuo returned to the mainland, the advertising screen on the street played an advertisement that made him confused.

Which science fiction movie is going to be released, and the advertising method is quite chic.

Chen Nuo subconsciously reacted that this was a promotional advertisement for the release of a certain science fiction movie.

He wasn't a voyeur, he didn't look at the situation on Earth just now, and he didn't understand what was going on.

"Hey, brother, borrow your phone and make a call."

Looking around, Chen Nuo greeted a brother who walked by in a friendly manner, ready to borrow a mobile phone to call Sister Lin.

The speed of the city's development is simply nerve-wracking, and it only took a long time for the whole city to change greatly, and there was not a single street he knew, and he couldn't even find his villa.

"Dude forgot to bring the bracelet when he went out?"

The brother who was shouted by Chen Nuo was very happy, and took off a bracelet on his wrist with a click, and the bracelet stretched into a smooth tablet full of technology.

The tablet lights up, the light shines, and a holographic screen emerges, showing the familiar phone icon.

High-definition holographic screens?

Chen Nuo took the tablet, a little confused.

How many years have I been gone, and why has the world become unrecognizable?

And also...... How does this thing work?

"Call 1367388654......"

Chen Nuo thought for 1 second and read calmly.

In the era of smartphones, there was a voice function, and he didn't believe it would ever have one.

Sure enough, he guessed right.

The holographic screen goes to the voice dialing interface, depending on the situation or a video call.

Honk! Honk!

The dial rang for two seconds, and the call connected.

"Hey, hello, may I ask ...... to find it?"

Sister Lin's assistant secretary appeared on the screen, and before she finished being polite, her expression suddenly froze, and the next moment she shouted respectfully: "Mr. Chen, wait a minute, I'll transfer the call to Mr. Lin now." ”

As she spoke, the picture trembled, accompanied by the sound of knocking and pushing the door, and the sound of dialogue, Sister Lin's image appeared on the screen.

"You're back, where are you?"

The moment she saw Chen Nuo, a trace of excitement and joy flashed in Sister Lin's eyes, and then she asked very gently, her tone was like that of a wife at home facing her husband who came back from a business trip.

“......”

Chen Nuo looked around: "A place called Zhongyue Street should be a newly built community street. ”

"Okay, I'll go pick you up now."

Sister Lin didn't say much, and simply hung up the call.

"Thanks, brother."

Chen Nuo returned the holographic bracelet or holographic mobile phone to the brother just now, looked at the cars driving on the street and asked curiously: "I haven't been out at home for too long, why are there all electric cars on the street." ”

The trust of the spacious streets, there are no longer a few people who have cultivated to the peak of cell transformation.

Of course, this is not surprising, after all, Chen Nuo gave the Super Nutrient Block technology to it before he left last time.

With sufficient nutritional resources, it is normal for the whole people's cultivation to enter an outbreak.

The only thing that surprised Chen Nuo was that there was hardly a single fuel car on the street, all of which were electric vehicles with no air intake grille at the front and no exhaust pipe at the tail.

"Brother, you're not at home, you're practicing at home."

The buddy buckled the holographic phone to his wrist, and the phone turned into a bracelet with a bend and click, and explained to Chen Nuo:

"After human civilization studied the technology of the alien warship, there was a big breakthrough in battery technology and fast charging technology, and it can run 2,000 kilometers in half an hour.

In order to promote the popularization of electric vehicles and protect the environment, the state has imposed heavy taxes on fuel vehicles and provided high subsidies for the scrapping of fuel vehicles. ”

"That's pretty good."

Chen Nuo nodded, and from the simple change of electric vehicles, he saw a lot of information.

First of all, the superconducting material at room temperature has broken through, and it is not an ordinary superconducting material, which requires a superconducting material with high critical current.

If there is no breakthrough in this, it will take less than half an hour to run 2,000 kilometers.

Because energy is conserved, whether it is an electric vehicle or a fuel vehicle, the energy consumed to do work for 2,000 kilometers is the same, if there is no superconducting material with high critical current, it is impossible to deliver so much electrical energy in half an hour.

Materials are the foundation of all science and technology and the cornerstone of all industries.

Breakthroughs in room temperature superconducting materials, the transformation of the electric vehicle and automotive industry, the earth-shaking changes in the electronics industry, and the breakthrough of controllable nuclear fusion must also occur.

Nine times out of ten, the thermal expansion engine was carried out by ultra-high temperature exhaust gases from nuclear fusion.

Controlled fusion engine ≠ engine engine.

Nuclear fusion produces heat, which is energy, and it is impossible to propel a warship without conversion.

The energy efficiency of nuclear fusion is not enough to bring the curvature engine, so there are only two ways to convert nuclear fusion into power.

The first is the ion engine, which ionizes the working fluid and then emits it at an ultra-high speed through a magnetic field, so that according to Newton's second law, thrust can be obtained to propel the warship to sail.

The second is the thermal expansion pressure, which is similar to the conventional rocket engine, and the principle is Newton's second law, but the expansion pressure is used.

Thermal expansion and cold contraction is very basic common sense, through nuclear fusion up to 100 million degrees Celsius ultra-high temperature exhaust gas, so that the gas working fluid undergoes ultra-high temperature expansion, this expansion pressure will push the warship to sail.

To put it simply, this is the same as playing with firecrackers when I was a child, covering it with a basin, and the expanding pressure of the firecracker explosion blew the basin up.

With nuclear fusion, without new engine technology, the speed of the spaceship will soar, and it must have been too much drinking.

"It's very good, but the development of science and technology is too fast, and the social change is too fast, and a bunch of problems have erupted."

The buddy nodded, then shook his head again, and pointed to a group of people pulling banners not far away.

"What's the situation?" Chen Nuo was puzzled.

"Artificial intelligence technology breakthroughs, unemployed and unemployed."

The buddy shrugged, shook his head and complained: "In fact, there is no problem in living if you are unemployed, the state announced a new policy last year, and the unemployed can receive a subsistence allowance."

Oh no, that's not a subsistence allowance, it's a high subsistence allowance, and the subsidy amount is enough to live a well-off life.

But people, in fact, are cheap.

If you are busy working overtime every day, you are complaining, and you can't be idle if you have nothing to do.

Besides, everyone wants a better life, and Gao Bao can't satisfy everyone's desires, so it's a mess of work. ”

"Brother, you wait here for your friend, I'll go to work first, if I'm fired, I guess I'll have to pull up a banner."

This buddy chatted for a few words, and hurriedly said goodbye to Chen Nuo after reading the time.

"Okay, thank you just now."

Chen Nuo waved his hand in response, looked at the crowd holding the banner and fell into contemplation, and shook his head: "Artificial intelligence replacing jobs causes a wave of layoffs? It's a headache. ”

Crunch!

Without waiting for Chen Nuo to think about it, an electric supercar stopped in front of Chen Nuo, and the window was lowered, revealing Sister Lin's smiling face.

"Uncle Chen, get in the car!"