At this time, Ye Feng has the heart to kill, Nima's, you are not a gossip reporter in later generations, so digging into the root of the question, he twitched his throat for a long time, and finally replied: "Actually, we humans have a common ancestor, it is Australopithecus, we humans are Australopithecus evolutionary......" He explained for a long time, and finally told the primitive man the theory of evolution. Yes, Ye Feng stole Darwin's theory of evolution, and if Darwin wanted to become famous in later generations, he could only put forward another theory.

Everyone turned their heads to each other and discussed the theory of evolution, leaving behind the issue of cleaning that Ye Feng had raised earlier.

Ye Feng saw that the building was about to be crooked, and hurriedly said: "So, from now on, we must clean up well in the future." Now is the time, action! ”

When everyone heard this, there was a voice of grief, and they all said that they had just eaten enough and didn't want to move. Ye Feng was speechless, well, the power of the masses is strong, Ye Feng can't change it, he has to silently go and make a few brooms first.

The broom is relatively simple to make, find a thin wooden pole, as long as it is suitable for people to hold in their hands, the tribe cut a lot of bamboo before the autumn, the bamboo branches that have been shaved are still on the ground, it is very good to use it to make a broom, find a thin vine, tie these bamboo branches to the end of the fine wooden pole, a simple broom is done.

I did this seven or eight times, and when I returned to the cave, everyone was still lying lazily. Especially Tachiba, in broad daylight, as a chief, he actually snored on his bunk, and the sound resounded throughout the cave.

Seeing this, Ye Feng was furious, and he worked hard to prepare the tools, they were still lazy there, and shouted: "Start cleaning all for me, who doesn't do it, don't want to eat tonight!" ”

Ye Feng's roar startled people again, especially Duoye, who jumped up directly from the bunk, looking at the source of the sound with vigilant eyes, thinking that it was a robber.

Ye Feng threw the broom to a few people around him, first taught them how to sweep the floor, and then said to the rest of the people: "I don't care what method you use, clean yourself or the hole for me, is it clear?" All the people did not dare to answer.

After the people dispersed, Ye Feng suddenly remembered that if he wanted to clean his body, how could he do without cleaning supplies such as soap, according to the current technical limitations of the tribe, it was still a little difficult to make soap, mainly because there were no spices, but it was more than enough to make soap.

Ye Feng found a clay pot, gathered the animal fat that people usually don't like to eat, put it in the clay pot, and boiled it on the fire, and after a while, the hot oil juice appeared in front of Ye Feng's eyes.

He took some plant ash from the fire, which contained a lot of alkali, soaked it in water, and after standing for a period of time, the plant ash contained in the ash would be fully precipitated into the water, and it became the alkaline water needed to make soap.

Ye Feng fished out the dregs that were floating in the clay pot, and the dried animal fat tasted good, but Ye Feng didn't grasp the time, and it tasted a little bitter, he couldn't stand the taste anyway, and the primitive people ate it with relish, as if the bitter taste didn't exist.

Then it is the mixture of fat and alkaline water, as for the proportion, Ye Feng has not remembered very clearly, Ye Feng had to try slowly, fortunately he remembered a little, oil is more than alkaline water, and then it is in the fire to wait for it to slowly evaporate, solidify, and become a piece of soap.

Ye Feng tried it many times, all failed, he thought about whether it was a matter of proportion, and then denied it, because the proportion was incorrect, and the soap made in the end would also be in a semi-solidified state, but the soap made now did not look like soap at all.

Ye Feng then checked to see if the problem appeared in the other steps, and finally he found that there was no problem with the other steps, but he forgot one section - the need for pine resin.

Ye Feng looked at the north wind outside the cave, the corners of his mouth flashed a wry smile, this cold day, where to find pine resin, just as he was about to give up, he happened to catch a glimpse of the wood used to burn the fire on the ground, these woods accounted for yellow lumps, Ye Feng buckled a piece and saw that it turned out to be resin.

Ye Feng Yile, it is okay to replace it with resin without pine resin, he grinds the resin into powder and sprinkles it into the pot.

Then simmer slowly over low heat, stirring gently with a wooden board. Wait until the water in the pot has completely evaporated, and that's the soap.

Ye Feng cut the soap into pieces, the side of the knife was rough, and the cross-section cut out was uneven, as if a dog had gnawed it.

I took these soaps to the people who needed to clean their bodies, and found that these primitive people had swept the floor of the cave clean, and the roof of the cave was also knocked down, but it also made the cave smoky and dusty.

The garbage swept out formed a small mountain, more than half a person high, take a closer look at the contents inside, dust, leftover bones, dead branches and leaves, and even a few pieces of dry dung, fortunately it is not human, but the little wolf, otherwise Ye Feng would have vomited on the spot.

Due to the dust in the cave, Ye Feng didn't immediately step into it, he put the soap on the edge of the cave, picked up a pottery, and prepared to fetch water to sprinkle it on the ground.

As soon as he arrived at the river, his face suddenly froze, and he saw a group of big men, naked, fluttering back and forth on the surface of the river full of ice blocks, and the flying waves were almost a foot high, and from time to time there were bursts of hearty laughter.

There was also a group of primitive people on the shore, also naked, waving the animal skins that had been taken off in their hands, and letting out a primitive and excited roar at the people in the river. The north wind blew their skin red, and they enjoyed it as if they didn't feel it.

A few black lines appeared in Ye Feng's head, no need to guess, these primitive people did this because of his words: "I don't care what method you have, clean yourself or the hole for me......"

Primitive people have coarse nerves, and it is difficult to do so. If they are allowed to toss like this any longer, they will have to fall ill for a large part. Ye Feng hurriedly shouted, "Hey! What are you doing, come up to me! A bunch of two goods, aren't you afraid of freezing to death? ”

The people in the small river hurriedly climbed ashore, shook the water stains on their bodies, picked up their animal skins from the ground and put them on their bodies, and stood in place and looked at Ye Yefeng, not knowing what was going on.

Ye Feng saw them standing stunned, raised his foot and kicked the person closest to him, and shouted, "Look at what!" Why don't you go back and build a fire to roast yourself, and see what you shake one by one."

A group of primitives ran away, and after a while they entered the mouth of the tribe's cave and disappeared from his field of vision.

To be continued