Gu Guo tugged at the stinky animal skin clothes on his body, and was stunned for a while before accepting the fact of crossing.

He was pulled into the system space in his sleep, and in a daze, he used the 62 civilization contribution points summarized by the system to select a priest's son to cross the opening.

Thinking he was dreaming, he forced himself to wake up, only to find himself lying in a dark cave when he woke up. There was a bonfire at the entrance of the cave that was about to be extinguished, and a lean man was sitting next to it, and the man was pulling the charcoal burned in the bonfire with a branch in his hand.

Gu Guo took a breath of cool air, and before the man turned around, he quickly squinted his eyes and pretended to be asleep.

Recalling the option to choose the opening game in his sleep, Gu Guo vaguely remembered that there were also options such as tribal leaders, priests, and senior hunters. However, these options require more than 70 contribution points, especially the tribal leader and priest, which reach 100 and 110 points respectively, making Gu Guo's only 62 contribution points sigh.

And the best option left for him is the son of a priest who contributes 50 points, and if he is lucky, he can become a tribal leader.

Now that he thinks about it, Gu Guo broke out in a cold sweat, fortunately, he didn't order the old tribal warrior worth 60 points when he chosen, in case he became an old man in his forties and fifties, he would really regret it to death.

"Ding!"

"Welcome to the battlefield of Gaia!"

"You've been through a lot, from the germination of the first life underwater, to the giant beasts of the Stone Age, to the first upright walk of man. Now, embark on your greatest quest: from the cradle of early civilizations to the vastness of the stars! ”

"All the inventions and creations related to you, the rise and fall of civilizations, and the changes of history, will be transformed into civilization contribution points. Now, start your journey to the great civilization! ”

"Name: Gu Guo

Civilization Contribution Points: 12

Civilization: Early Neolithic"

Bursts of ethereal voices sounded in Gu Guo's mind, and the same voice as in the dream appeared, making his body tremble slightly with excitement.

"Crossed, there is a system, primitive people, ah this!" Gu Guo was sleepy, and his heart was ecstatic.

"But the system, even if I rivet it hard, it is impossible to develop the primitive tribe to the space age in my lifetime, do you have a special life-sustaining prop in the system?"

Obviously, under normal circumstances, in terms of the length of life of primitive man, that is, less than a hundred years, it is absolutely impossible to raise the primitive tribe that is still polishing stone tools to the space age of launching satellites.

Even if there is a system to open a big hanging, the success rate is minimal.

Unless there is a great indoctrination of knowledge, and the knowledge of physics and materials science in the 20th century on the earth is forcibly instilled into the minds of hundreds of thousands, or even millions, of primitive people, not only that, but the productive forces of millions or even tens of millions of people will have to develop for tens or even hundreds of years, otherwise everything is empty talk.

According to the urine nature of the system, the civilization contribution points exchanged for such a huge project must be an astronomical number of trillions.

"When a traverser dies, the system will summarize the civilization contribution points accumulated by a traverser, so that the traverser can choose the world and class to traverse the next time they cross."

"Of course, the time-traveler can also use civilization contribution points to exchange for the knowledge and technology of the current civilization era, and the required contribution points are determined by the level of the civilization era."

The ethereal voice of the system sounded in Gu Guo's head.

Gu Guo understood, in his previous life, twenty-four years ago, in exchange for 62 contribution points, 50 of which were used by him to reincarnate.

If he has no achievements in this primordial world, then he will take the remaining 12 contribution points for the next crossing, and maybe he will only be an ordinary primitive.

In addition, contribution points are used to exchange knowledge and technology, which is particularly important for the development of the country.

Although he can only exchange the knowledge and technology of the early Neolithic Age, he may be lucky enough to find copper, tin ore, or even iron ore near the tribe, so that the civilization can suddenly leap into the Bronze Age or even the Iron Age, and then the exchange will be the technology of the Bronze Age and the Iron Age.

You must know that the earth has gone through a full 3,000 years from the Iron Age to the Steam Age, and the knowledge and technology of the Iron Age can completely drive the great development of civilization.

Back to reality, the sky outside the cave was already cloudy, and the man guarding the campfire carefully kept the fire and brought the charcoal ash to the corner near the entrance of the cave.

Gu Guo got up and walked to the pile of charcoal ashes, and pulled out two pieces of charcoal from the pile of charcoal ashes.

Because the outside of the cave entrance was inclined downward by more than ten degrees, the sun that had not yet risen from the horizon could only shine a limited amount of light into the cave, and a group of clansmen wearing animal skin coats like Gu Guo were sleeping soundly.

"Goo, got up early today?"

The man who was keeping vigil at the entrance of the cave picked up some firewood from outside, and when he saw Gu Guo drawing a circle with charcoal on the stone wall at the entrance of the cave, he asked.

A system with its own translation function is a good system.

Gu Guo turned his head to look at the man who was greeting him, and in the morning light, he could see the man's appearance and figure clearly. With a height of about 1.6 meters and a lean body in his early 100s, it is obvious that the man in front of him has been in a malnourished environment for a long time.

This cooing is obviously calling itself.

It turns out that his name in the primitive tribe is Gugu......

"Wake up."

Gu Guo smiled at the man, since he was the son of a priest, his status might be higher than that of ordinary clansmen, and the man saw that Gu Guo did not explain to him what the circle he drew was, so he went to work on the matter at hand.

Gu Guo's painting circle is not to learn from the ancients to paint on the rock wall, but to prepare to make a simple sundial.

Not only that, Gu Guo also paid attention to the orientation and angle of the stone wall, he chose a rock wall perpendicular to the direction of the rising sun at 90 degrees, the rock wall was inclined downward, and there was a thumb-thick hole in the middle of the circle he was drawing.

Gu Guo ran not far away, broke a straight branch, and inserted it vertically into the hole.

At this time, the sun had just risen from the horizon, and the sunlight cast a slender shadow on the branches, and Gu Guo drew a long black line with charcoal at the shadow.

"Today's sunrise is now!"

With a sundial, you can accurately record the time of the four seasons, and even if there is no moon on the planet, you can make a more accurate calendar. Of course, it takes more than half a year to record the first record, and when the time interval between the highest and lowest points of the shadow at sunrise is recorded, the time between the summer solstice and the winter solstice can be accurately calculated, and thus how many sunrises and sunsets are needed in a whole year.

Of course, Gu Guo would not think that the place where he was now was the earth, because before dawn, he saw a red moon hanging in the sky from the entrance of the cave, and the shape of the moon sea was completely different from the moon of the earth's satellite.

The Neolithic Age on Earth is only 20,000 years ago, and the moon's appearance cannot be turned upside down, so the conclusion is about to be made.

It's a wild world!

Since it is a different world, it means that the distribution of minerals in Gu Guo's memory is completely invalid, and all the minerals have to be re-searched.