Prehistoric I was pinched out by Nuwa

The last time the merit surfaced but did not fall, it should be when he created words.

This time, the emergence of the decimal system can also lead to merit, which surprised Li Yang.

He already believed that the decimal system was very important, but he still underestimated the role of the decimal system on the human race.

"Decimal, is it really so important?"

Li Yang was a liberal arts student in his previous life, and he was also exposed to mathematics later on, but in general he mainly focused on literature!

There used to be a saying that 'learn mathematics, physics and chemistry, and you can go all over the world'?

There seems to be, but Li Yang doesn't remember exactly what the original words were.

But that's roughly what it means.

The decimal counting method elicits merit, Li Yang is already quite calm.

Although the merit is good, it is nothing if it is not down.

The human race is still an unarmed human race.

铁？

Burning iron?

Li Yang couldn't help feeling that chemistry was too important.

He took the liberal arts route at first because he was not proficient in physical chemistry.

Li Yang felt quite regretful.

Iron is important, but salt is more important.

From the very beginning of the tribe, they did not know that their bodies needed supplementary salt.

Li Yang knew it but didn't put salt making on the agenda for the time being, he didn't forget that he still has the method of salting!

At present, there are not many human races, and the wild beasts hunted by traps every day can not only satisfy their hunger with meat, but also supplement salt with beast blood!

This is also the reason why Li Yang didn't let his clansmen go to look for rock salt.

The merits have not faded, so it can't affect Li Yang.

After Li Yang explained the decimal system, don't talk about anything else.

Instead, let a few people learn from each other and discuss it, and make sure they know the decimal notation method.

The emergence of merits made Li Yang deeply aware of the importance of the decimal system to the human race.

In this regard, he would rather slow down the teaching of double-digit multiplication, and let Xia An and the others understand the decimal system first!

In the morning, Li Yang didn't ask a few people to do anything, and stayed where they were to study.

And he got up and left.

He was going to find some firewood.

I got the method of burning charcoal before going to bed yesterday.

Naturally, today I will try to make charcoal.

The burning temperature of charcoal is higher than that of trees, so naturally he will not abandon the former.

This time, he prepared to experiment with burning charcoal.

He fired the charcoal, and then he taught the method to the tribe!

The first step in firing charcoal is naturally like making pottery, which is the selection of materials.

Charcoal can be made from a variety of woods such as willow, pine or bamboo!

These woods can be fired into charcoal.

But there is a difference.

Light and low-density firewood, the charcoal burned out will burn faster, and may even be burned before the desired temperature is reached.

For example, bamboo charcoal burns very fast.

Compare consumption of firewood.

These knowledge are some simple charcoal manufacturing knowledge contained in the formula.

Li Yang knows how to choose.

As for the kind of firewood with high density?

There are ready-made.

hardwood tree.

This kind of hard and tough firewood is heavier than other trees in the same knot!

No matter how stupid Li Yang is, he still knows that the heavier one should be denser for the same size!

Hardwood trees are the heavy ones.

Hardwood trees are suitable for making wooden guns, and hardwood trees are relatively rare in general.

Li Yang didn't really want to use hardwood trees to burn charcoal.

But he has no other firewood at present.

If it doesn't work, you can burn some bamboo.

This is the prehistoric world. Although this bamboo is also bamboo in the previous life, the density may not be the same.

Li Yang made it when he thought of it, and the first time was just a trial firing.

It is not too late to change to other wood after success.

The second child and Xia An were studying, but Li Yang didn't call them.

Pick out a few clansmen from the guards and lead them to the bamboo forest.

Following the traces of the last felling, continue to cut bamboo this time.

It is still a selection.

Li Yang chose tall and strong bamboo and felled it.

The thickest bamboo here almost requires two adults to hug each other.

Li Yang didn't cut down too many trees, only two trees!

Two thick bamboos are enough.

Together with the tribe, bring back the two felled bamboos!

Afterwards, Li Yang did it himself, without asking his clansmen to help.

He cut the bamboo into sections!

I didn't use a ruler to measure it, but each section would not exceed one meter.

He cut out more than 70 knots of two bamboos!

More than 70 knots were piled up in a big pile on the side.

"These should be enough!"

Li Yang looked at the piles of bamboo, and he picked out the longest section that he specially left.

This saves two meters!

"Go and find some dry grass and dead leaves! Dry vines are also fine!"

Speaking of vines, Li Yang thought that vines could also be burned into charcoal?

Many trees are not as hard and heavy as the vines.

He ordered some of the tribe to leave to find dry grass and dead leaves, and he ordered the rest of the tribe to dig a hole.

The pit is not deep, about half a meter wide!

The diameter of the pit is large enough to accommodate this section of bamboo.

Li Yang inserted the bamboo into the hole, and then ordered his tribe to fill in the soil.

He stepped on the soft soil and stones, and a bare bamboo that was more than one meter above the ground stabilized the pillar.

"Put these bamboos next to this bamboo!"

With the help of his clansmen, Li Yang naturally wouldn't do it alone.

Many people are powerful.

The operation is also fast!

Li Yang didn't pile up all seventy knots of bamboo!

He even disliked the fact that the bamboo joints were too thick, and asked his tribe to use stone axes to divide the bamboo joints into four parts from top to bottom!

There are only ten bamboos divided into four!

The ten knots are divided into four, which is enough for Li Yang to make a one-time cellar for burning charcoal!

When Li Yang commanded the people to pile up these bamboos, the people who found dry grass and dead leaves came back one after another.

After the bamboo was piled up, Li Yang put the dry grass and dead leaves on the surface of the bamboo pile.

The dry grass and dead leaves submerged the bamboo, and it was impossible to see that it was a pile of bamboo.

After finishing these, Li Yang patted his head.

"Forget about sticking mud!"

There is enough time, Li Yang is not in a hurry.

He asked his people to use clay pots to get water, and then dig holes and mud!

"By the way, there's still hay!"

To prevent the charcoal cellar from being burned and cracked during the firing process, Li Yang ordered the tribe to get some hay, chop it up and mix it into the mud.

Li Yang was worried about the remaining steps, so he did it himself.

He spread mud over piles of dry grass and dead leaves.

Part of the dry grass and dead leaves were exposed on it, and it was not sealed.

The same is true below, he chose to dig four holes in four directions: front, back, left, and right!

Then dig another hole in the middle of the two holes.

A total of eight holes at the bottom!

Here's how to fire a charcoal cellar in one go!

Eight holes are air inlets!

Done with this.

Li Yang asked his clansmen to fetch torches.

Dry grass and dead leaves will burn when exposed to fire!

They ignite instantly when they touch the flame.

The dry grass and dead leaves burned for a while, Li Yang used mud to seal the dry grass and dead leaves exposed above!

The top is blocked, and there are eight holes left below!

To burn charcoal is to get rid of the moisture or other messy things in the wood.

The charcoal burned in this way burns more purely, unlike wood that still emits thick white smoke when burning.

Blocking the top is only the first step!

Li Yang can't leave, he still has to observe.