After leaving the school, Wang Yang went to look at other buildings and found that many of them had begun to use wooden beams.

is testing whether it will be more stable.

"You made the beams, did you make the foundation for the house?" Wang Yang suddenly asked.

Zhang San replied: "According to the geography book, there is not much water in the soil on the savanna, the land is compacted, and as long as there is no earthquake, the foundation can not be laid, so there is no fight here." ”

"But the wheat field has a foundation, and it is close to the river, and the deep soil is relatively wet, so there is a foundation."

Wang Yang nodded and explained: "If you want to build a two-story building or even a multi-story building in the future, let's lay the foundation." ”

Zhang San nodded, didn't think deeply, they never wanted to build a house with more than two floors, and it wasn't a lack of land, so why do that kind of thankless thing.

At the end of the day, Wang Yang walked all over the tribe's house, and he saw many things, even the laboratory.

After learning chemistry, they know that pure table salt is sodium chloride, and there are other impurities in it, and they are extracting other impurities.

In this way, not only is the table salt pure, but there is also an additional chemical, which can be extracted by the action to create a new chemical.

In the long run, it will be possible to collect all kinds of substances in the chemistry book and then use them.

Wang Yang thought it was very interesting, so he watched them make it.

I saw them take a piece of coarse salt without any processing, put it in a small bowl, drip some water into it, and after a while take out the salt.

The water was poured into a large wooden barrel.

Wang Yang looked a little dizzy. I didn't know what they were doing, so I stepped forward and asked, "What are you doing?" ”

One of them came up and said, "Extract magnesium chloride." ”

Wang Yang knows that magnesium chloride is also a salt. But not table salt, which is sodium chloride.

"You're going to extract it like this?" Wang Yang was very puzzled.

They nodded: "It should be extracted." Chemistry books say that when the room temperature is about 20 degrees, the solubility of magnesium chloride is higher, and the solubility temperature of table salt is very low. ”

"That is to say, at this time, the magnesium chloride will dissolve when the water drops, but the table salt will not dissolve."

Wang Yang was stunned for a moment when he heard this, and couldn't help but be surprised: "There is a chemistry book that teaches you to extract magnesium chloride?" I don't read much, don't lie to me. ”

They shook their heads: "It is not written directly in the chemistry books, but their solubility at different temperatures is written." As soon as we do the math, it's almost done. ”

"Uh...... I'm a little dizzy, Zhang San, hold me a little. ”

Wang Yang felt very defeated, it was indeed the case when he said it, but he hadn't thought about it, anyway, he was taking the liberal arts exam, and all this science knowledge was memorized back then, so he thought about it deeply.

Now it is spoken by this group of primitive humans. I feel a little out of order, and I have been emphasizing drawing inferences, but as a result, primitive people have learned and forgotten......

But Wang Yang still had questions: "But how do you know." Twenty degrees now? ”

The crowd shook their heads and said, "We haven't made a thermometer yet, so we can only test it every day, clumsy records." ”

After speaking, he was embarrassed to touch his head. A look of shame.

"Well...... This one...... That's true, but how can you be sure that it's magnesium chloride and not table salt that is dissolved? Wang Yang asked again.

Everyone looked at Wang Yang inexplicably: "Because magnesium chloride is bitter." You'll know it when you taste it. ”

Seeing Wang Yang's stunned face, everyone was even more confused. Isn't that common sense? Why does it seem that Wang Yang doesn't know?

But thinking about it carefully, everyone was ashamed, those books were written by Wang Yang, can Wang Yang not know? It's definitely testing them! Or they are depressing why they use such a stupid method.

"We are too stupid to test every day at each time to judge the temperature, otherwise your old man will teach us another method? We're so embarrassed to go out and tell people that you taught us by yourself......"

Everyone looked guilty and ashamed......

"Say! How can you not say! Be sure to tell people that I taught you! Although your method is really stupid and not good, how can I dislike you because you are stupid! I won't give up on you! Disgrace with you! ”

Wang Yang's face was straight, and he didn't blush at all, which moved the group of people to tears.

"Ahem...... I won't say much about these, how are you going to use magnesium chloride? Wang Yang asked.

"Oh, according to the combination of biology and chemistry, the composition of paper is...... So you can add it to paper, use it to make paper, and then according to the combination of biology and chemistry, magnesium chloride can be used as a food additive, you explained what food additives are, and you also said that the ingredients, among them, magnesium chloride, and then according to ......"

"Stop, you go on! I won't bother you for the sake of the teacher! ”

Wang Yang hid his face and walked away, and secretly swore that if he traveled back to modern times, who said that primitive people were stupid, I promised not to kill him!

In fact, this should be considered unexpected, and it stands to reason that those people are particularly good at chemistry, and it is estimated that their minds are relatively easy to use, and their talents are strong enough.

Of course, the most important thing is to teach yourself well! Wang Yang said to himself.

"Huh? Wait a minute! There's something wrong with that! Wang Yang suddenly woke up and turned his head to ask Zhang San.

"They extract something like magnesium chloride from the salt, doesn't that make the salt even more pure?"

Zhang San was a little dazed, he was not very interested in chemistry, so he turned his head and asked an adult next to him, and then said to Wang Yang with a smile: "Well, that's right, salt has become purer and more suitable for human consumption." ”

"Well, good, good, these guys are good, when did they refine magnesium chloride?" Wang Yang asked as he walked forward.

Zhang San asked the person behind him again, and then said to Wang Yang: "Just a few days ago. ”

"Well, it's pretty fast, it should have wasted a lot of salt and time, right?" Wang Yang was in a good mood, and his proud expression seemed to have extracted magnesium chloride.

Zhang San hesitated, but still said: "They spent more than three months, and a total of 1,000 kilograms of salt were wasted. ”

"Well, more than three months, the time is very short, a thousand kilograms, not much, wasting some is ...... What the! What did you say! They wasted a thousand kilograms of salt to extract a magnesium chloride for Lao Tzu!! ”

Seeing Wang Yang's sudden change of color, Zhang San said with a bitter face: "Yes, they wasted a thousand kilograms of salt, an average of ten kilograms per day, and finally figured out the extraction method of magnesium chloride." ”

"For this reason, the orthopedic surgeon scolded them many times, and he was distressed to death, saying that they were too bastards and too ......"

Zhang San's voice became smaller and smaller, because he saw that Wang Yang's face was getting more and more ugly, and he couldn't help but glance at the few people beside him.

Those few people consciously stepped forward silently and blocked Wang Yang's way, obviously doing this often, and they were very skilled.

"I'm going to %¥#......! A thousand kilograms of salt! Do you know what the concept is? That's 2,000 catties of salt! ”

"It's such a waste to find a way to extract magnesium chloride! There are other ingredients in that salt, and if they were all extracted, they would waste all the salt mountains on him! ”

"Loser! Bastard! Look at Lao Tzu who doesn't pick their skins! ”

The more Wang Yang spoke, the more excited he became, the more he scolded, the more excited he became, the whole person threw himself back, and several people around him suddenly hugged him skillfully, secretly happy in his heart: "Fortunately, I often catch osteopaths like this." ”

After scolding for a while, Wang Yang finally lost his anger and continued to walk forward, secretly vowing.

If you travel back to modern times, who says that primitive people are smart, I promise not to kill him!

It was night, and everyone knew that Wang Yang had come out, and they all surrounded him, only daring to watch curiously, but not daring to speak.

Most of the people still hadn't seen him, and he hadn't seen most of them, so he had to say hello one by one.

They were very welcoming, and they came up with a pen and paper to talk to him and say their names.

Wang Yang was very surprised: "You took your own name? ”

Everyone nodded vigorously, which was easy to remember.

Wang Yang thought about it, and then tried to remember their names, they seemed to like to use numbers to choose names, some were called '1', some were called '2', and some were called '3'.

Good guy, it's troublesome to go to math class in the future, just say a number and someone will stand up: "Here!" ”。

What makes Wang Yang remember especially is that some guys are ingenious, called '2 noses', well, enough for 2 forces, and called 2 dogs, they are indeed as their name suggests.

Wang Yang felt dizzy after remembering it for a while, so he simply found Zhang San and asked him, "How many people are there in the tribe now?" ”

Zhang San asked people to bring a small notebook, and what was written on the notebook was two words: "Number of people." ”

Each page is the number of people of the tribe for that year.

"The tribe now has 2,500 people, and there should have been more, but there are also two or three hundred people who have died of old age and accidents."

"Yes, almost." With a little calculation, Wang Yang knew the amount of population growth in the past five or six years.

If you take the book, you can see how much the population is growing each year, and the number of children, and the number of people in the labor force.

Turning another page, there is also a very detailed record of how many people have been assigned to various jobs.

"Good job, I don't have time to get these, you remember them, right?"

Seeing Wang Yang's smile, Zhang San knew that Wang Yang was very happy, but he still shook his head and said: "I didn't do it, it was Li Si who made it, you can see the fan shape he painted, it's very standard." As he spoke, he took out a protractor to measure ......

"I won't look at any of that." Wang Yang looked at the book silently and sighed secretly in his heart.

"If the sixth generation is the first generation, now the fourth generation has been born, the third generation has joined the workforce, and the second generation has become the pillar of the tribe."

He suddenly said to Zhang San: "Are there any differences in how these young people in the tribe behave? ”

At the beginning, the second generation of young people had signs of wanting more resources, and it is hard to imagine whether there was any chaos in the fourth generation now.

(Today's third chapter, if nothing else, there will be another chapter.) (To be continued......)