Gu Guo felt that the most fundamental contradiction at present was the contradiction between people's growing demand for food due to the increase in population and backward social production. And his tribe, judging by the amount of food obtained and consumed every day, has not yet reached a state of saturation.

Perhaps because of the crude salt refining methods that already existed in this era, when he precipitated the first spoonful of salt, he only gained 12 civilization contribution points.

"Name: Gu Guo

Civilization Contribution Points: 60

Civilization: Early Neolithic

Unlocked technologies: Pottery (Neolithic), Salt (Neolithic)"

Finding that his mother was watching him from a short distance, Gu Guo smiled at his mother and continued to rub the rope twisted from bark fibers in his hand.

The shadow of the sundial has moved upward, indicating that the direct point of the sun is moving away from the latitude where the Gu tribe is located, and to put it bluntly, winter is coming.

Now he was wrapped in only a hide, and it was not enough to get cooler at night, and it was estimated that the time was equivalent to October on earth, and before long the animals would migrate to the south where the vegetation was more lush and the climate was warmer.

There are not many days left for the tribe to accumulate food for the winter.

Gu Guo once discussed with his mother to exchange salt with other tribes, but his mother said: "We don't have food, and other tribes won't have too much. With your salt this year, men won't be risking the night out. ”

"Then exchange our food for them!" Gu Guo said.

In his mother's surprised gaze, Gu Guo smiled and ran to peel the bark.

The long-range projectile weapons of the Stone Age were nothing more than catapults, spear-throwers, and bows. At the current level of productivity, the spear thrower is undoubtedly the most lethal, but it requires large body movements, which can easily expose itself to scare away prey, and the overly long pole will be scratched by branches and shrubs in the woods, which will affect accuracy.

What Gu Guo was compiling at this time was the string on the bow.

The bow, a weapon that converts elastic potential energy into kinetic energy, is not as powerful as a spear, but it is convenient for concealment and aiming, thus increasing the efficiency of hunting. In addition, hunters can carry more than a dozen arrows at a time, and even in the face of a plural number of wild boars, they are not afraid at all.

As for the material of the bow, fir wood, oak, and peach wood are preferred, of course, these knowledge were all searched by Gu Guo from Qiandu in his previous life, and now, his eyes are black, and he can't correspond the trees in this world with the pictures on the Internet in his previous life.

In desperation, he could only look for some small trees with a diameter of about five centimeters, take about 1.2 meters long, cut them down with a stone axe, and learn from the video of the Australian brother he watched at the beep station in his previous life, and use a stone axe to split the wood from the middle.

After splitting two of them, finally on the third attempt, Gu Guo got two complete bows.

Cut off the two ends with a stone chisel to make the whole bow wide in the middle and narrow at the end, and then polish it with a stone knife until the bow body forms a perfect symmetry.

He worked on this process for a day and a night, and the stone knife was sharp enough to cut animal skin, but it was more cumbersome to cut the plant fibers, which caused him to take twice as long as the Australian brother to sharpen the bow.

A two-centimeter-deep notch is carved with a stone knife at both ends of the bow body and is used to assemble the bowstring.

With your right knee against the grip, your body and arm exert force at the same time, and you can bend the bow into the shape of a crescent moon and successfully hang the bowstring.

The method of making arrows is relatively simple, small branches with the thickness of fingers are everywhere, and there are many pheasant tail feathers used as priests' crowns in the tribe, which are more than enough to make hundreds of arrows.

Peel off the outer skin of the twigs, fix the tail feathers in three sections with wood fibers at one end, and bake the other end with tinder, which is carbonized to sharpen the sharp corners of the stone.

Gu Guo spent another day making thirteen arrows, and he sewed a quiver out of a piece of animal skin.

After trying the bow in his hand, it took a lot of effort to pull it away, and Gu Guo estimated that with his current small body, it would not be possible to shoot three or four arrows. Hunting is impossible anymore, he is now following the men's group only to lag behind, and there is a world of physical difference between a ten-year-old child and a twenty-year-old young man.

It seems that he can only wait for the evening to teach his second uncle to shoot a bow and arrow.

"Ding! Unlock bows and arrows to settle civilization contributions! ”

"After the settlement is completed, you will get 108 civilization contribution points."

"Name: Gu Guo

Civilization Contribution Points: 168

Civilization: Early Neolithic

Unlocked technologies: Pottery (Neolithic), Salt (Neolithic), Bow and Arrow (Neolithic)"

"Ding! With over 100 contribution points, the system store is now unlocked! ”

"Contribution points can be exchanged for knowledge and technology!" Gu Guo secretly applauded.

"Open the System Mall!"

A burst of blue light flashed in front of Gu Guo's eyes, and an interface with thousands of items appeared in front of him, but most of the icons were dark.

"Technical:

Pottery (mastered) contribution points: 100,

Salt (mastered) contribution points: 100,

......

Charcoal (unmastered) contribution points: 100,

Building a house (unmastered) contribution points: 500

......”

"Knowledge:

Simple botanical knowledge (not mastered) contribution points: 1000

Simple zoological knowledge (not mastered) contribution points: 1000

Simple knowledge of geology (not mastered) contribution points: 1000

......

Simple mineralogy knowledge (not mastered) contribution points: 1000

Simple astronomy knowledge (not mastered) contribution points: 1000

......”

Gu Guo looked at it again and again, and silently closed the system mall, he couldn't afford what he needed, and he didn't need what he could afford.

Techniques like charcoal burning and house building, he can create them in this poor era by just a few days of groping by himself, but if he buys them with contribution points, he needs to create 6 epoch-making technologies of the same level as bows and arrows, which is completely worth the loss.

In his previous life, Gu Guo studied mechanical engineering, and he knew almost nothing about looking at stones, animals, and plants, and only knew the most familiar ones in life.

"For now, if I hold it for a few years, I should be able to change one or two things of knowledge, and now it's better to solve the food problem first."

Gu Guo picked up the bow and arrows and went to the grove near the cave to practice archery, he still overestimated his own physical fitness, and when he was about to shoot the third arrow, the left hand holding the bow trembled a little, and the arrow that was shot out did not know where it had drifted.

Some of the women in the tribe who had returned from gathering gathered around Gu Guo to watch him perform this new thing like a crescent moon.

Shaking his hand, Gu Guo rested for a while, he aimed at a thick tree thirty meters in front of him that needed to be surrounded by two people, and in the exclamation of the women, the arrow left the string and was firmly nailed to the bark of the tree.

Gu Guo ran over and pulled out the arrow, the tip of the arrow was a little flat because of the repeated shots, the good news was that the arrow was two centimeters deep into the bark of the tree, if it was replaced by his second uncle, it must be able to shoot farther.

The women stepped forward one after another to ask what was in Gu Guo's hand, and Gu Guo first raised the bow in his left hand and shouted, "This is the bow!" Then he raised the arrow in his right hand and shouted, "This is an arrow!" ”

"Bow?"

"Arrows?"

The women repeated these two unfamiliar terms, and they all cast envious and fearful glances, they wanted to step forward and stroke the arrow in Gu Guo's hand, but when the skin of their hand touched the tail feathers of the arrow, they suddenly retracted their hands, for fear that the arrow would fly to their bodies.

Gu Guo's mother stood on the periphery of the crowd, rubbing the small clay pot in her arms, and the smile on her face was even better.

Prey, times have changed!