In the jungle, a stout male lion was galloping, and a man was riding on its back.

The man on the lion's back had a painful expression, obviously showing a painful expression, baring his teeth.

"Roar!"

With Simba's jump, Zhao Yunxiang was shaken into the air, and with the action of inertia and gravitation, he fell heavily on Simba's back.

"Oops!"

Zhao Yunxiang screamed miserably, rolling his eyes for a full 4 seconds.

It's like a bare-chested man falling from a high place in a riding position, and all the impact is absorbed by the crotch.

Simba was running fast and it didn't take long to get to the shelter!

A flower of flame is blooming in the dark of the night, and the flames can drive away the vast majority of wildlife.

Beasts are born to fear fire!

Zhao Yunxiang and Simba rushed back in a hurry, originally worried about Han Xuening's safety, but seeing the active figure next to the fire, Zhao Yunxiang was also relieved.

Han Xuening was holding a burning wooden stick and waving it, while raising her head and shouting at a big tree not far away, "Get me down!!"

As the burning stick was waved, the flames became particularly confusing, and the creature hiding in the tree was cautiously looking at the sturdy woman under the tree.

As Han Xue Ning waved the fire stick, the creature curled up in the tree also trembled, it was obviously frightened.

After Zhao Yunxiang got closer, he found the creature on the tree, it was quite large, about 1 meter long, with a slender body, slightly fluffy hair, and looked like a house cat.

"Cats?"

Zhao Yunxiang tilted his head and said suspiciously, "Is that one on the tree a cat?"

Han Xuening held the fire stick in her hand and said, "This is a very nasty wild cat, it likes to steal food the most, its meat is not very tasty, and it is a little sour." ”

"Okay......" Zhao Yunxiang nodded noncommittally, the difference of 4700 years, some of the earth's creatures have indeed changed greatly, and some creatures have become even Brother Xiang, who likes the animal world, dare not confirm it.

The poor kitten's helpless "meow" in the tree completely caught Simba's attention.

Wildcats are fierce, but not as fierce as lions......

And just like that, a huge lion crawled on the ground and whimpered, and a wild cat barked in terror in the trees.

"Look what this is?" Zhao Yunxiang put the leaves on the ground, and Han Xuening looked closer, not knowing what those slimy white objects in the leaves were.

"What are these?" Touching the natural rubber among the leaves with a branch, Han Xuening said that she had never seen such a strange thing.

"This is called rubber, do you know?" Zhao Yunxiang knew less about the civilization inheritance in the Alpha Clan, and he could test Han Xuening through some common sense.

After all, she is the inheritance teacher in the alpha tribe, responsible for inheriting the civilization passed down from the previous generation, and she can know a thing or two about some knowledge points.

"Rubber?" Han Xue squinted her eyes and thought carefully, a pair of smart big eyes looked very good when thinking about the problem, she didn't seem to find the word rubber, and shook her head slightly, "I really don't know what rubber is." ”

"Rubber is a natural material, and when it solidifies, it can be used to make many things, such as insulated gloves and shoes. Zhao Yunxiang can't say how much rubber can make for a while, but it is certain that this natural material is indeed a very valuable thing.

"Hmm!" Han Xuening listened in a daze, and the primitive teacher who didn't have the concept of gloves and shoes just nodded vigorously.

Zhao Yunxiang didn't plan to continue playing the piano to the cow, but asked, "Is the bone needle finished?"

There are many materials required to make shoes, but bone needles and threads are particularly important, which are necessary to connect rubber and fur to make shoes.

"Can you see how well it grinds?" Han Xuening took out three bone needles that were 10 centimeters long and about 2 millimeters in diameter.

The bone needle is well ground, the whole body is smooth, and the two ends are sharp, but there is no needle eye.

Of course, Han Xuening didn't know how to do the eye of the needle!

Before making the eye of the needle, Zhao Yunxiang took out some charcoal from the fire, "crushed the charcoal, the more broken the better, and then mixed it with rubber." ”

"Why?" Han Xue stared at the big smart eyes of the water spirit, the cherry mouth opened slightly, and the two over-evolved little tiger teeth were exposed again.

"The fusion of substances will cause a chemical reaction of the substance itself, and the addition of carbon to natural rubber will make the texture of the rubber very hard, which is more conducive to the rapid solidification of the rubber, and it will also become very wear-resistant. ”

There are many types of rubber, such as rubber bands and car tires, which are made of rubber, because of the different manufacturing processes, which also determines the difference in hardness and elasticity.

In the primitive nature, all resources are scarce, any material is in the most primitive state, Zhao Yunxiang can only use the most primitive things to splice and fuse, to create new materials!

Charcoal powder is rich in carbon elements with too many impurities, and after fusing with rubber, it will indeed make the rubber hard and more wear-resistant, but too many impurities will also make the fusion of rubber and charcoal have problems, such as cracking.

However, this is not what I am worried about now, a pair of cracked shoes is better than barefoot.

"Ding ding~!"

Zhao Yunxiang was holding a stone axe and quartzite, beating the quartzite again and again, striving to smash out a slender stone flake, which was used as a drill to drill holes for bone needles.

The hardness of the substance is absolutely determined by the making of tools, just as diamonds can cut glass, punch holes in hard bones, and use hard and sharp stone chips.

A piece of quartzite has been smashed for a long time, and a lot of stone chips have been mined, many of which are more suitable for making meat knives, and some are also very suitable for making arrows.

Zhao Yunxiang found a small piece of stone chips, which was more like the tip of a small flat-edged screwdriver.

Drop the tip of a small wooden stick to the split, stuff one end of the stone chips into the crack, and tie it with vine string to make a shoddy hand drill.

The shoddy hand drill quickly drilled through the bone needle in Zhao Yunxiang's hand and made a pinhole, and his production method stunned Han Xuening.

"That's amazing!" Han Xuening looked at the hand drill made by Zhao Yunxiang in disbelief, "The small wooden stick and gravel chips are actually so strong?"

"The big wooden stick is bigger and the crushed stone is stronger!" Zhao Yunxiang played with a few stone chips in his hand, and these stone chips were relatively lucky, and they were all beaten into the shape of spears.

Originally, there were 6 pieces of gravel similar to Mao arrows, but because he was not skilled, Zhao Yunxiang destroyed 3 pieces when he was beating, and now there are only 3 pieces of stone that can barely be made into a long spear.

These stone flakes are not sharpened, and the edges and corners are hammered out of gravel, although they are not neat, but they are extremely sharp and piercing, and they can easily kill large beasts with this.

As early as the Ice Age, primitive people learned to make sharp spears from semi-precious stones, which were used to kill mammoths and sloths.

The two worked together, Han Xuening used a stone to break the charcoal, and tried to put the powder into the rubber, after a long time of fusion, the color of the rubber changed a little, and it was not as sticky as at the beginning, and the texture became much harder.

"Yes, the carbon in the charcoal is basically fused with the rubber, and you can start making shoes. "The first thing Zhao Yunxiang brought was nothing else, but a large ball of yellow mud.