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Chen Rui can guess.

This is what the aliens did more than a billion years ago. These aliens came to the earth in "atomic powered spaceships". They built atomic reactors in the valleys of this uranium-rich mining area, and released them by atomic fission or fusion. The energy is the energy power that powers their activities on Earth.

Later, they left the earth and returned to their hometown --- a very distant planet by atomic-powered spaceship. They left this extremely ancient and mysterious atomic reactor on the earth.

Perhaps, these reactors were built by a previous generation of Earth civilization.

Many scholars have pointed out that prehistoric civilization was destroyed by a massive nuclear war.

Whether it's an alien masterpiece or a civilization built by a previous generation of Earth, both are possible.

Chen Rui intends to go deep into the cave and continue to explore.

There are few clues.

Millions of years or even hundreds of millions of years are enough to erase all traces of prehistoric civilization or alien activity on Earth.

For example, prehistoric civilization murals, some metals, prehistoric human remains, footprints and books will be exposed to the air for a long time for millions of years or even hundreds of millions of years. Structural changes, destroyed.

Still, some things will be preserved.

For example, gold, silver and other metal products, the chemical properties of gold and silver are extremely inactive, it is difficult to react with other substances, and theoretically can be stored for an infinite time.

There are also three discs in Chen Rui's hand.

The discs are about the size of a palm, thin and light, with a tiny hole in the middle of each disc, and a tiny groove carved from the edge of the disc to the hole in the center of the disc.

The disc was silver-white, and when Chen Rui touched it in his hand, it was very smooth. It was not made of metal or carved from stone, but was made of a special material that Chen Rui did not know.

The disc has been exposed to the air for a long time. After a long period of time, it has not changed at all. After washing away the soil on the disc, it is still very new.

Chen Rui picked up the disc and observed it carefully.

Some differences were found on the disc.

The surface of the disc is very smooth, silvery-white, but there appears to be a black substance smeared in the tiny grooves carved into the center of the disc as it rotates around the edge.

Chen Rui looked at this disc carefully, and the more he looked at it, the more it looked like something.

Seems a bit like Chen's early 20th century gramophone discs.

Many people can often see such a scene in some video materials of old Shanghai in the early 20th century.

There is a dance party in the room.

On a table in the corner of the room, there is a large disc that is constantly rotating. The surface of the disc is engraved with arc-shaped grooves. The disc is pressed by a sharp needle. singing.

This is the phonograph invented by Edison.

Could it be that this is a disc left by aliens or prehistoric civilizations to record sounds, images, numbers or other signals.

The silver-white disc made of special material is the support.

The black material in the groove is a magnetic material or a material that can store information.

Chen Rui speculates whether it is possible to read the information stored by aliens or prehistoric civilizations on magnetic materials or substances capable of storing information through electricity or other energy substances through a needle.

Chen Rui's guess is very likely.

Chen Rui put the three discs into the Pregnant Haizhu space.

Next, Chen Rui found nothing in the cave.

Chen Rui collected some uranium ore and buried the uranium ore in the depths of the Yuhaizhu space.

This batch of uranium ore can extract about 18 to 20 kilograms of weapons-grade uranium.

These weapons-grade uranium can produce about 5 to 7 nuclear bombs.

Natural uranium ore generally contains 0.72% uranium.

Whether human beings are using nuclear energy peacefully or making nuclear weapons, enriching uranium is necessary.

Uranium-235, which is 3% abundant, is used in nuclear power plants.

Uranium-235 content of more than 85% is called weapons-grade enriched uranium, which is directly used to make atomic and bombs.

Therefore, Chen Rui's acquisition of this batch of uranium ore does not mean that he can have nuclear weapons at once.

Obtaining enriched uranium is a very complex series of processes, from prospecting, mining, beneficiation, leaching, smelting, refining and other processes, and enrichment and separation is the last process, which requires a high level of technology.

One kilogram of weapons-grade uranium 235 requires 200 tons of uranium ore. Due to the issue of nuclear weapons, uranium enrichment technology is a sensitive technology that is strictly prohibited from proliferation by the international community.

At present, for Chen Rui, obtaining this batch of uranium ore is of little significance, but it may be available in the future.

Chen Rui left the valley, called home, and reported that he was safe.

Chen Rui found an open space near the stream.

Two sea fish were ingested from the ocean in the pregnant sea pearl space.

In the stream, two fish were scaled, gutted, and cleaned with a dagger.

Then, some dead branches and leaves were collected and a fire was lit.

The branches are sharpened and the fish is skewered and grilled over the fire.

After the fish is cooked to seven points, sprinkle with salt and seasonings.

After the fish was cooked, I took out a bottle of red wine from the space. The red wine, the fragrant grilled fish, and the dinner started facing the sunset.

After eating and drinking.

While there was still some light, Chen Rui took out the sheepskin map and spread it out on the slate.

According to the terrain, landforms, and landmarks marked on the sheepskin map, tomorrow's travel route is formulated.

"It will take another 2 days to reach the destination marked on the sheepskin map, a mountain lake, if all goes well."

Putting away the map, Chen Rui entered the Pregnant Sea Pearl space.

In the pregnant sea space, it is already dark night.

A moon hangs high in the sky, and the white moonlight shines on the ground, making Chen Rui feel a very dreamy hazy feeling.

There are beds and various daily necessities in the space.

After taking a shower, brushing your teeth and washing your face.

Lie in bed and quickly fall asleep.

The next day, Chen Rui got up very early. After taking a shower, he left the space and started to move further into the depths of Daqing Mountain.

This morning, Chen Rui passed through a bamboo forest.

Bamboo forest covers a large area, with thousands of acres, with undulating peaks, ridges and ridges, and the atmosphere is natural.

The common arrow bamboo grows in the bamboo forest, and the bamboo fragrance is clear and distant. From a distance, it looks like a beautiful bamboo forest painting, splashing ink freehand.

Seeing the beauty of the bamboo forest, Chen Rui felt refreshed.

Breathing in the fresh air infused with the smell of bamboo, feeling the continuous input of it into one's lungs, cleaning the lungs that are gradually turbid due to the city, and deeply feeling the precious gift of nature.

I really want to build a bamboo house and live here for a long time.

It is no wonder that the ancients were able to write the poem "I would rather eat without meat than live without bamboo".

Chen Rui heard movement in the bamboo forest not far away.

Chen Rui walked over and saw a fat bear-like animal lying in front of a hole, spraying into the hole with its mouth, and slapping the hole with its front paws.

---------

Thanks to book friend zxyu for rewarding 788 starting coins.

Thanks to the book friends for the noisy ringtones for the reward of 588 starting coins.

Thanks to lnyzzy, Yilan Mochizuki, Xuechenxin, near the Arctic Circle and other book friends for their rewards.

thank you very much.

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