(The content of the previous chapter has been modified, you can see the content when you refresh it, and the chapter name needs to be edited after the section and modified after work, forgive me.) ）

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Carbon-14 dating, also known as "carbon-14 dating" or "radiocarbon dating", is a measurement method that calculates the approximate age of a sample based on the degree of decay of carbon-14, and this principle is usually used to determine the age of paleontological fossils.

In layman's terms, organisms replenish carbon-14 through respiration when they are alive, which is constant when they are alive, and when a plant or animal dies, the carbon-14 in its body begins to decay, which can be used to detect age.

The main raw material of banknotes is cotton pulp, sometimes mixed with some hemp pulp, chemical wood pulp, etc., and the composition of this can be used for carbon-14 dating.

But the biggest problem with this thing is that it's hard to be accurate, and the closer you get to modern times, the more accurate it becomes.

When Wang Aihua found out that the technology used in banknotes was being tested and had not yet been put into use, he was extremely shocked.

From a technical point of view, this is an unquestionable real banknote.

At first, he only thought that this was a sample banknote made by a central bank in another country, although he was a little puzzled as to who would make such a thing, and how Li Tongchen got it.

Until one day he accidentally remembered that he did a carbon-14 test to see what year it was made.

The results shocked him.

This somewhat old-looking banknote turned out to be brand new! And the carbon-14 value contained in it is constant, no matter how you test it, there is no attenuation in the slightest!

"Lao Li, where did you get this banknote? Can you tell me? Wang Aihua said with a solemn face.

Li Tongchen did not answer his words, but joked: "Your central bank still has a carbon-14 detection device?" Can you believe anything that is decades accurate? ”

Wang Aihua said with a serious face:

"It's not the equipment of the central bank, I asked an acquaintance of the Chinese Academy of Sciences to do the test, and their latest equipment can be accurate to one month! According to that buddy, the age judgment of your banknote should be negative! ”

As he spoke, he took out an envelope from his bosom and carefully took the bill out of it.

Li Tongchen didn't speak, took the banknote and looked at it carefully, and then looked at the news on TV about deep space dormancy technology, and his heart was excited.

The banknotes are real, but not the thing now.

It really was born in 2025.

The year 2025 in a parallel universe.

This would explain why the carbon-14 identification is the way it is.

And the deep space dormancy technology, like the plot in the Gray Tide Apocalyptic Mission, also appeared in this world.

The last bit of doubt about the commander also disappeared at this moment.

Li Tongchen excitedly watched the introduction of "deep space dormancy technology" on TV, and suddenly his eyes turned red and tears flowed.

The great era has come, a great era that destroys the world, a great era that turns the tide.

And he has become one of the participants, witnesses, and saviors of this great era.

A lofty sense of mission filled his heart, and a kind of spontaneous pride made this sixty-year-old man seem to have regained the passion of the fiery era.

"How can he ...... How can he ......" Li Tongchen looked at the hundred-yuan bill in his hand, which belonged to the disciples, and muttered.

Wang Aihua on the side saw that Li Tongchen suddenly cried as if he was enchanted, and muttered to himself, and couldn't help but panic:

"Lao Li! Lao Li, are you okay!? Why are you stunned? Is there something going on? Where the hell did this come from? ”

He also had some speculation about the banknote in his mind.

The central bank obviously does not make such a thing, and those criminal groups that make counterfeit money generally do not have this strength.

To be able to create such a realistic banknote must be an act of the state.

Is it the economic war that the Eagle Country is secretly engaged in? Or is it a country in Northeast Asia that wants to rely on counterfeit money to get wool? Or is it the work of some international criminal syndicate?

Li Tongchen wiped the corners of his eyes and said to Wang Aihua:

"Aihua, make you smile...... I'm fine...... I'm worried and happy at the same time......"

With that, he walked straight to the kitchen with the banknote, turned on the gas stove, lit the banknote, and burned it.

He has already revealed his identity as a disciple in the virtual space, so he doesn't need this bill as a proof of identity.

It's a hassle to keep it.

Of course, the commander-in-chief handed them this banknote from 2025, and the deeper meaning should be to dispel their doubts.

Wang Aihua said urgently:

"Lao Li, why did you burn this money? Is it a mess? Alas...... It's okay to burn it, it's okay to burn it......"

Then he looked at Li Tongchen and asked:

"What the hell can't you tell me? If you think I can't solve it, let's find Jia Dong, he is now the deputy commander of the military region, and the official is very big, see who dares to fool around! Besides, you're a national treasure now! Who dares to touch you? ”

Li Tongchen was unprecedentedly relieved at this time, smiled slightly, and said:

"Don't worry, Aihua, I'm fine, it's safe, you help me keep it secret, don't tell anyone...... Happy today, let's have a good drink later. ”

"The money is burned for you, I tell others that people don't believe it......" Wang Aihua rolled his eyes and said, but for this old classmate, he still trusts him very much, this matter should touch some secrets at the national level, and he didn't ask again, "I'll tell you, I came all the way to find you today, and I don't drink Moutai under ten years!" ”

"Hahaha, you wine bug! How long have you been thinking about my 20-year-old bottle of Moutai? Li Tongchen scolded with a smile, turned around and walked towards the bedroom......

……

Time flies, and a month is fleeting.

In the small courtyard on the outskirts of Taicheng, Shen Feng's consciousness tentacles detached from cyberspace and showed a satisfied smile.

The Salvation Army's energy is not trivial, and since the information of the Purification Society was revealed to players in the virtual space two days ago, a major purge of the Purification Society has begun these days.

Many members of the Purification Society, who had been dormant for years, were uprooted, thrown into prison, or directly assassinated.

This is already an open declaration of war against the Purification Society.

But this is nothing, after all, the other party had directly assassinated Shen Feng, and there was no point in continuing to hide.

These days, nearly a thousand members of the Purification Society have been cleaned up.

Brendan, the president of the Rattlesnake Company, was safe and sound, under Shen Feng's order, and was under surveillance.

And the Purification Society seemed to be dormant, and there was no reaction all the time, and the assassination of Shen Feng never appeared again.

What made him a little wary was that many of the members of the Purification Society who were found and executed chose to gouge out their own eyes, or stare at the executioner's face before they died, and there was even a look of greed in their eyes.

Regarding this, Shen Feng also reminded the members of the Salvation Army through the game system, asking them to turn their backs to those who were executed as much as possible, and not let the other party see their true faces.

The eyes seem to have a special meaning for the Society of Purification.

Although he still still hasn't figured out what the mystery is.

During this time, although Shen Feng was much more idle, he was not idle.

Under his control, clusters of nanomachines were attached to the landing gear or cabins of planes, flying around the world, being sown like seeds, and gradually lurking.

The cluster of nanomachines dropped from the plane itself is grayish-white, and the refraction of sunlight is reduced by configuration, as if it were a large bird falling from the sky, which is not conspicuous at all.

Even the radars of various countries are difficult to detect, let alone care.

These nanomechanical swarms are also like termites, which can be devoured after landing, and then lurk in dark places where they can receive signals, which are extremely hidden.

Although Shen Feng is temporarily active in China, he may not be able to go out one day, and these latent nanomachinery clusters will play an extremely important role at that time.

This is his life-saving weapon.

These days, the bracelet of the "real doomsday game" has not assigned him a new task, and Shen Feng is also happy to be idle, going to school and living as usual, feeling the days full of fireworks and warmth, and his heart has become much calmer.

It's Jingwei's humanoid robot, although it appeared for a few days in the name of a transfer student, after all, it was a little too eye-catching, and then he took sick leave and didn't go to school again.

Jingwei himself is messing around in the basement every day, and he doesn't know what he's doing.

Shen Feng didn't bother to care.

It's still comfortable on a peaceful day......

However, what made him a little puzzled was that this "real apocalyptic game" had been silent for a little too long and a little strange......

"Shen Feng, look, how is my appearance? Realistic or not? It was the weekend, Shen Feng was lying on the sofa eating fruit, and he listened to Jingwei's voice.

Then I saw a handsome mixed-race beautiful girl pushing the door and walking in, wearing nothing on her body.

"Poof...... The dragon fruit in Shen Feng's mouth squirted out, and he hurriedly said, "Get dressed!" Get dressed! You're so realistic! ”

At this time, Jingwei is completely different from the previous nanomechanical cluster mimicry, it looks as if the skin can tremble, extremely elastic, and the long hair is also real hair, without the slightest metallic feeling.

Jingwei happily spun around and asked:

"Really? Can you still tell it's a robot? I use the latest type of mimic silicone, and it has temperature and touch, in fact, it is a kind of artificial skin, which feels exactly the same as a human, and uses a bionic mechanical eye and human hair, hehe, except for no hair, everything looks exactly like a real human girl. ”

Shen Feng picked up a large bath towel next to him and threw it to Jingwei, and said:

"Sister, can you please get dressed?"

Jingwei wrapped himself in a bath towel, laughed at Shen Feng, and said:

"Hahahaha, you brother! Human beings are nothing more than this, the old lady doesn't need to rely on any disasters at all, she can destroy human civilization by relying on beauty! ”

Shen Feng's face was full of black lines at this time, and he was speechless for a while at this crazy artificial intelligence, this thing still knows how to play......

Then he said with a serious face: "Sister, get me one too?" You're amazing! ”

Jingwei snorted coldly and said, "I haven't heard that there is a male version of the inflatable doll, what's the use of you simulating a stand-in?" Do you want to deceive the little girl's body? Obscene! ”

Shen Feng was speechless.

You're quite capable of taking on the role! But how do you feel that it's not a mixed-race transfer girl, a bit like the style of the neighborhood committee aunt?

The two were talking nonsense, Shen Feng's bracelet shook suddenly, he immediately turned his head to look, and saw a line of blood-red words suddenly appeared:

“…… Suffer...... Attack...... Temporarily closed...... Protection...... Civilization...... Combat ......"