Xu Chen was idle again.

While doing nothing, I took the charcoal and found a stone slab to study new knowledge.

Compared with the language and characters that communicate in daily life, numbers are also extremely important symbols of human survival.

It can be said that if we do not have mathematics, human civilization will not be able to develop.

Although mathematics is not very useful in this primitive era, it is definitely different from having or not.

There are less than fifty people in this small tribe at present, but no one can count them clearly. This has to be said to be a sad thing.

Therefore, Xu Chen decided to invent a numerical symbol and slowly teach these primitive people to learn simple counting and calculations, which is more conducive to communication and life will become more convenient.

However, numbers are an advanced creative symbol, neither tonematic nor pictogram. It is difficult to design a group of primitive people to easily learn and accept.

Xu Chen didn't want to teach Arabic numerals directly because it was too abstract. For this group of primitive people, it was similar to the Heavenly Book. Without strong learning and creative thinking, it was completely impossible to understand.

So after thinking about it, he finally thought of mahjong.

There is no need for too complex mathematics at the moment, you only need to design a simple numerical symbol that is easy for primitive people to accept and understand, and learn the simplest counting.

The patterns on mahjong are the easiest to understand and accept.

So he wrote and rubbed the stone slabs. After continuous design and research, he gradually developed a relatively mature idea.

That is to use the pie pattern on mahjong to connect all the points with lines to form a simple figure that can be easily identified and understood.

For example, a pie represents the number one, corresponding to the symbol i, just like a finger.

The two pie pattern represents the number two, corresponding to the symbol v, just like two fingers spreading.

The three circles are triangles, representing the number three, corresponding to the symbol △.

The four-pie pattern represents the number four, and is represented by z.

The five-cake pattern is the number five, represented by x.

Six cakes represent the number six, and they are represented by the Arabic numeral 6, because it is easy to understand by connecting it with a thread.

The seven-pie pattern represents the number seven, corresponding to the symbol e.

The eight cake represents the number eight, corresponding to the Arabic numeral 8, which is equivalent to two reverse crossed z characters, which is also easy to understand.

The number nine represented by Jiubian is represented by m.

As for Zero, he thought about it and decided to use a circle to represent it. Although it is difficult to explain, some things do not need to be explained clearly. After all, cramming education is also a part of human evolution.

This set of symbols is very different from the Arabic numerals that Xu Chen himself is familiar with, but it is closer to hieroglyphs, and therefore more in line with the level of primitive people's understanding of the world.

Like any language and writing, pronunciation and writing will not affect human communication. What is important is that it needs to form a mature system.

Just like a foreign language, if you learn it, you will be able to use it proficiently and will not affect communication or use at all.

After finishing all the basic numerical symbols, Xu Chen took a sharp stone and walked to the front of the stone wall where he was writing the diary, began to carve mahjong, and then carved the corresponding numerical symbols below.

Although he was beaten to the point of being bruised and swollen, a group of children saw Xu Chen writing and painting again, so they gathered together to watch.

Ye Lailailailai and goes around and follow a group of women in his busy leisure time, and he will also run over and take a few glances. Ye is full of interest in these mysterious symbols left by Xu Chen on the stone wall. In addition, after learning these hieroglyphs, he becomes more and more awe and respect for Xu Chen.

These mysterious characters seem to have a magical magic that deeply attracts her and makes her want to learn and use it.

"One~"

Xu Chen raised a finger and pointed to the symbol i written under a circle.

"One~"

A group of children followed suit, but there was a very clear sound mixed in it.

Xu Chen turned around, and a group of children quickly pointed at Ye, and one of them stuffed a stick into his hand.

Ye quickly covered his butt with both hands, his face full of shame.

As the insistent shouts of a group of children, Xu Chen slapped her on the butt, and then pointed to the number one.

"one."

"One...ga!" Ye held it in for a long time, but finally he dragged out a final note.

"Gagahahaha~" a group of children burst into laughter and screaming.

Xu Chen held his forehead and shook his head, but seeing Ye's shameless look, he didn't hit him again, and he felt a little lucky.

One Ga is better than One Library.

Otherwise, a group of savages who communicate from time to time will make him feel even more uncomfortable.

In the afternoon, Xu Chen, who was idle, was teaching a group of children to count their fingers and mahjong cakes on the stone wall, and read the newly created numerical symbols.

However, for this group of primitive savages, abstract counting is much more difficult than finding food in the woods.

Therefore, until the evening when Moba brought a group of women back, apart from Kaiye, the number of children with a group of children could only count to five.

This made Xu Chen want to cry very much.

This group of children should be between three and seven years old, which is the best stage of enlightenment.

In order to make a group of children learn faster, after dinner, Xu Chen brought a basket of milk fruits and let the children count themselves and get as much as they can.

This game with food temptation has greatly increased the interest of the children. No matter how big or small, they are very enthusiastic. They sit in a row and start counting the milk fruits in front of them.

So when the sun was completely set, and when the adults urged them to go to bed, except for the two youngest children, the remaining few were counted one or two more, and then they all hugged their milk fruits with excitement and went to sleep with the adults reluctantly.

However, even though he entered the cave and lay in his own grass nest, he was still secretly fumbled to count the milk fruits secretly, because as long as you count enough tomorrow, you could get more milk fruits.

The ethnic group has limited food. After eating two meals a day, there will be basically no food to be distributed. If you want to eat, you can only find it for yourself. It is not allowed to steal reserved food.

Although children are greedy, they have developed this habit of group life since childhood and are familiar with this food distribution system. Children aged five or six have to follow adults to help with work in caves or near them. When girls are over ten years old, girls have to follow women to collect food in the wild, while boys have to follow men to go down the mountain to learn hunting.

Recently, due to Xu Chen's invention and innovation, the food harvest has doubled and women are too busy, so no one cares about a group of children and they all run around with Xu Chen.

Mother Ba and a group of women seemed to have acquiesced to this situation, and they also treated Xu Chen with special preferential treatment. They distributed a lot of food every day, and did not impose much control on his occasional distribution of food to the children.

After all, the food collected this year is very sufficient.

As for the food like milk fruit, if Xu Chen had not invented the vine basket, it would have been impossible to get so many of them back. Moreover, milk fruit is not a real food. Although it is delicious, it does not fill the stomach. The real food is still the rhizomes and seeds containing a lot of starch.

A group of children followed Xu Chen and were delicious and fun. They didn't have to work every day, so they were naturally very happy. Therefore, even if they were beaten by Xu Chen every day, they were all in pain and joy.

Although it is difficult to count and recognize words, the temptation of food is even greater.

...

If you want to do a good job, you must first sharpen your tools.

In the next few days, a group of men were still divided into two groups, one went down the mountain to hunt, and the other continued to make bows and arrows.

In order to increase the power of bows and arrows, these men were very savage when making them. They used harder wood, and the materials of the arrow shaft were thicker and longer. In order to ensure lethality, the arrows were made more sharply.

Xu Chen didn't teach them much, but he would occasionally observe and put forward some suggestions for improvement, such as the bow should not be too hard, it needs to maintain sufficient toughness, and the arrow should not be too heavy, so that it can fly further, and the arrow must maintain a certain proportion of gravity so that the shot arrow will not roll, etc.

In addition, in order to reduce the weight of the bow and increase the strength of the bow, wood with good toughness but insufficient strength can be tightly wrapped with materials such as animal bone horns with ropes to increase the strength and elasticity of the bow, etc.

The development of any civilization is driven by the emergence of wise men who transcend the race.

From the ancient legendary Youchao family, Suiren family, Shennong family, etc. to Dayu's flood control, to the various sages of the Spring and Autumn Period and the Warring States Period, these are all guides leading mankind from barbarism to civilization.

Xu Chen traveled through time just a few times with a small butterfly flapped his wings and invented several simplest tools, but it brought earth-shaking changes to the lives of these primitive people.

The emergence of bows and arrows will open up the long-range attack mode that humans dream of, and archers will become the most powerful warrior of mankind for a long time.

As several bows of different sizes, thicknesses, lengths and lengths were made one after another, many arrows were made. A group of men, while busy, developed an excited and crazy practice mode in the woods in front of the cave.

The dirty fur skirt, the big furry hands, the hideous face of gritting teeth, and the sound of constant sounds, the trees that grew peacefully on weekdays were constantly destroyed one after another.

Every time a simple feather arrow hits the position, there will be a burst of cheers and cheers.

As a technical guide, Xu Chen will naturally observe and demonstrate every time he trains.

However, his bow is completely incomparable to the strength of the bow made by these savages.

The bows made by these savages are thick and hard, with the center of the bow body thicker than an egg, the bow string is thicker than a little finger, and the arrow shaft is thicker than the middle finger.

Rough, simple, and barbaric.

This is the unified feature of these bows and arrows.

Most of the bow Xu Chen can't pull it open.

The hardest bow Xu Chen used his strength to pull it, and even the strongest wind could only barely pull it once or twice.

The effect brought by hardness is naturally huge.

In front of such a strong bow, the arrow looks too weak.

Arrows made of bones can be shot to scrap once or twice.

However, the greater the power of the bow and arrow, the more physical energy it consumes.

If you want to hit the target, accuracy is more important than strength.

Injuring wild beasts is more in line with the elements of hunting in this era than killing one arrow.

Maintaining sufficient physical strength is also the most important means of survival in the wild.
To be continued...