Hardcore crisis

Since the 20th century, humans have spent a hundred years detecting and listening to electromagnetic wave signals throughout the universe, hoping to find evidence of extraterrestrial life. However, more than a hundred years have passed, and humans still have not found definite evidence of extraterrestrial life. . In the entire universe, there are 200 billion stars in the Milky Way alone, and many times that many planets.

It has been tens of billions of years since the universe was born. Logically speaking, there should be many living planets similar to the earth. Why has mankind not found an extraterrestrial planet after spending hundreds of years?

Quite simply, if human history is placed on the scale of the universe of tens of billions of years, it is really insignificant.

Suppose there are two hundred people in a square, and each person represents a corresponding life planet, then one person only has one blink of an eye. If two people blink together at the same time and see each other, it means that two people Civilizations discover each other.

Now here comes the question. Without being able to speak or transmit information, who can be sure that he will be able to look at another person at a close distance in the blink of an eye?

On the time scale of the universe, the birth to the rise and fall of human beings is just a blink of an eye. It is really very unlikely to expect to coincidentally be in the same development period or even the same survival period as another extraterrestrial civilization. .

These extraterrestrial beings with snake scales stared at Lu Yuan without blinking with their four pairs of eyes, and they made high-frequency sounds from nowhere. They seemed to be exchanging information with each other very regularly...?

The two parties are obviously unable to communicate. Lu Yuan has confirmed this. The vocal organs of each other are very different. I guess the most fortunate thing is that the other party can reduce the frequency of sound waves. Wait, why does the other party lower the sound waves? Frequency of?

Lu Yuan was stunned and suddenly realized something was wrong.

Assuming that humans accidentally discovered extraterrestrial life, would they consciously raise the frequency of their voices in such a short period of time?

Soon, Lu Yuan understood why the other party did this.

A human came from outside alone.

Lu Yuan only felt that if he could see any weird alien creatures here, he would not be too surprised, but could easily accept it... But he was really not ready to see another human being here. .

Are you kidding?

This is a star field that is an unknown number of light years away from the earth. There are actually humans here?

After being in a daze for a moment, Lu Yuan immediately focused his gaze on the human being walking across from him.

"Huh?"

With this concentration, he discovered the different characteristics between that person and humans.

The man's hands were obviously much longer, almost vertical to his calves, and his shoulders were much wider than a normal person's, his chin was slightly larger, and the bridge of his nose was too long. But no matter what, even if this person were placed on the earth, at most it would only make people feel that he grew up as a deformed child, a bit atavistic, but no one would deny that he is a human being.

Why do we meet humans here?

Is this a human being who came here from the earth before him, or is it... confirming the ridiculous speculation of a certain minority that human beings come from aliens?

Not many people believe this ridiculous speculation. It is fairly reliable to say that life on earth comes from extraterrestrial meteorites, but to say that humans come from extraterrestrials is unreliable speculation.

The man walked up to Lu Yuan and stopped, looking at the naked Lu Yuan with extremely human eyes.

After the particle reorganization, Lu Yuan no longer had any clothes. It was normal for him to be naked. What's more, at this moment, he would not feel ashamed or embarrassed even when facing human beings, not to mention several extraterrestrial beings.

As a human being who evolved into another life form, the only remaining connection with humans is some thinking habits, emotions, and the same physical appearance.

The man's mouth was slightly open, and the frequency of the sound waves was almost the same as that of a normal person, but it was a language that Lu Yuan had never heard before. No wonder those mechanical steel spiders previously lowered the frequency of the sound waves, perhaps thinking that he was a similar person to this person. .

Lu Yuan thought for a while, but to prevent the other party from thinking that he couldn't make a sound, he said, "Can you understand what I said?"

He spoke back and forth in Chinese, English, Russian, Japanese, German, and Spanish. The extremely confused expression on the other party's face also showed that he could not understand what Lu Yuan said at all.

This is normal.

If the other party could understand, Lu Yuan would really go to hell.

Human beings can be divided into three categories when it comes to deciphering unknown languages.

The first type uses unknown symbols to record known words; the second type uses known symbols to record words in an unknown language; and the third type uses unknown symbols to record unknown languages.

There is no doubt that the third category of unknowns is absolutely terrifyingly difficult to crack.

The above three types are all based on the earth's environment, and different national civilizations are all human beings. If they are extraterrestrial life forms, such as these snake-scale creatures, even the vocal organs are different, then crack The difficulty of the other party's language will continue to rise.

Fortunately, this "strange human" who suddenly appeared, although his appearance was a little weird, had the same vocal organs as ordinary humans, which showed that it was possible to decipher the other party's language.

The man seemed to have a high status among this group of extraterrestrial beings. He waved his excessively long right hand, and the three mechanical steel spiders moved away, finally not aiming their weapons at Lu Yuan.

Unlike Lu Yuan, who was naked, this man was wearing clothes of unknown material. It looked like a leather jacket, but it had a slight metallic sheen, which did not hinder the man's movements at all.

"What's the meaning?"

Seeing this suspiciously human guy, he pointed outside and walked out.

Lu Yuan thought for a while and followed closely. As this guy came outside, he saw what he said to the snake-scale life forms, and the snake-scale life forms stood aside.

Although the sunshine outside is not strong, it is still much better than the darkness inside the abandoned building.

It looked like a human being and fiddled with the items in a metal storage box. After a while, it took out a dark "can", held it in front of Lu Yuan, and made a strange sound in its mouth.

What are you doing?

Lu Yuan didn't know why, he frowned and took the black "can", not knowing what the use of this metal object that looked like a "can" was.

He simply shook his head, regardless of whether the other party could understand it, and handed the "can" back. He glanced around casually, picked up stones around, and began to arrange them on the sand.

It’s no problem if we don’t understand each other’s languages. There is one language that must be universal across the universe.

Of course it is the language of mathematics.

Lu Yuan first used one stone to represent the number 1, then used two stones to represent the number 2, and so on up to the number 10.

As soon as he finished posing, he looked back and saw that the suspiciously human guy was very happy and seemed to understand what Lu Yuan was planning to do.

1+1=2. This numerical calculation method in elementary mathematics may have had relevant concepts hundreds of thousands of years ago. The most common place value system currently used by humans is the decimal system. Lu Yuan used stones as the simplest system. The numbers are clear, and then the corresponding Arabic numerals are written below, and finally the decimal counting method is figured out.

This guy looks like a monkey.

Lu Yuan turned around again and saw this suspiciously human guy scratching his head and ears. Wasn't it very similar to a monkey?

In particular, this guy's arms are too long and he can make movements that are impossible for humans at will. The flexibility of his hands seems to be beyond that of normal humans.

"Um?"

Just after Lu Yuan gave the corresponding demonstration, this guy also squatted on the ground and used his fingers and stones to imitate Lu Yuan's placement.

From numbers 1 to 3, the other party uses one dot, two dots, and three dots to represent them. Starting from 4, the other party uses two dots plus a horizontal line among the three dots. When the number 6 is reached, it becomes a triangle. , the number 7 is counted from a circle...

"Hexadecimal?"

Lu Yuan quickly understood the other party's number system. It was actually a hexadecimal system with a 15-digit base that is rarely used by humans!

15 is the coincidence of the prime numbers 3 and 5, and is also the coincidence of the ternary and quinary systems. Therefore, the hexadecimal system retains the factors of the ternary system and the quinary system, and is an upgrade of each state of the decimal system. There are traces of ternary and quinary factors, and its quotient has factors of ternary infinitely recurring decimals 3 and 6 and factors of quinary finite decimals 2, 4, 6, and 8.

But that's not what surprised Lu Yuan.

The other party actually simply drew the double helix structure of RNA and DNA, pointed at himself, then drew a more complex double helix and double intersection pattern, and pointed at the snake scale life forms.

"I see."

Lu Yuan nodded slightly.

The hexadecimal system is a complex of simple two-factor 3 and 6 helices in the ternary system and simple four-factor 2, 4, 6, and 8 helices in the quinary system. The origin of life, ribonucleic acid and deoxyribonucleic acid, are both double helix structures. And DNA is composed of four bases, and there is a relationship between ternary and quaternary combinations.

Of course, this guy is not simply using the hexadecimal system, but is explaining that the hexadecimal system they use is related to their life structure.

The two parties used this method to communicate, which made Lu Yuan realize that although the two parties had completely different languages, the similar pronunciation methods and the fact that they could communicate face-to-face meant that it might not be practical to learn the other party's language. Impossibility.

But having said that, writing and communicating on the sand like this is too inefficient.

Lu Yuan looked around. Since the other party could make a mechanical spider, they should have a better communication platform.