After five days of clearing, the land had finally been leveled to a length of 200 meters and a width of 500 meters. What? Is it too late for a cheat? I've been hunting and building a lot of stone blocks the size of bricks.
The stone blocks are stacked in a cylinder shape about one meter in diameter right next to the planned building site of the city to make a simple furnace. From now on, I'll have to share the workshop with other people. What I'm going to do is.

"Zita, and May and Adelina. I have an important mission for you!

For some reason, Adelina is the most excited, but don't worry about it.

"You three are going to be making something called slaked lime. This job is very hard, but it's very important, so I've decided to entrust it to three people I trust.

I don't have to tell you that it's actually because these three people don't have any work to do in the village where there are more people.

"Yes, what is sosekai?

The one who raised her hand and asked the question was Mei, who was in good spirits.

"Slaked lime is an important material that will become a secret weapon in the construction of this city. It's not difficult to make, but it's very important, so please do your best. Good luck.

"Yes!

The siblings responded cheerfully. Adelina is watching them smiling.

Then we'll make slaked lime using the simple furnace we built over here. I'll work with you until you get used to it, so don't worry and be careful not to get hurt. The first step is to put a pile of shells into the pot inside the furnace. After that, add wood or other fuel from below and light the fire.
The box on the side is a tool called a blowtorch. The box on the side is a tool called a blowpipe. When you put the handle on the side in and out, the wind comes out of the opposite hole. It's a tool.

"What happens then, young man?

"The wind goes through this tube and sends the air into the next furnace. Then the temperature inside the furnace rises to over 1000 degrees Celsius. That's right.

"Is 1,000 degrees Celsius really that hot, big guy? How hot is it?

How hot?" "Well... the temperature at which water bubbles over when it is set on fire is about 100 degrees. It's 10 times higher than that, but it's over 1000 degrees when iron turns red and soft when making weapons. The temperature at which iron melts depends on the type of iron. Yes, sir!

"Yes, sir! How did you measure that?

This is Adelina's question. Well, it's a natural question.

"Well, you don't know, sir. Knowledge is certainly good if you can explain everything in a logical order, but it doesn't mean that you have to know everything. It is enough to know how to use it safely and correctly for normal people. "I know it's safe.

I know what "safe" means, but what does "correct" mean?

Adelina must have thought she was talking about the correct management of knowledge, what to use that knowledge and technology for... it's a difficult question.

The question was, "What does it mean to be correct? That's correct. If it is wrong or insufficient, the knowledge will not be reproducible no matter who does it or when. In my opinion, this is not sufficient knowledge. "Reproducibility...

"Reproducibility...the same thing happens no matter who does it or when...that's important. It's important.

"Let me also answer a question Adelina had earlier. It is important to use technology correctly. But people's justice changes depending on their position and situation... so there is no such thing as right. There is no right or wrong.

Adelina pondered with a difficult look on her face.

But I can tell you what I think is the right use of technology and knowledge. Who will be happy? Who will it be used for? Will anyone be sad? Won't someone be unhappy? If your answer is "yes", then you should be proud of yourself. If you are just blaming others because someone told you to, don't. That is the most foolish and cowardly use of technology. If your mind is not convinced, you are missing something. This is also true for the art of making things, and the art of fighting. Think about it for as long as you live, and it will be your treasure... whether you succeed or fail. "What if I fail?

"You don't mind if I fail?

The three of them looked into Masaru's face anxiously.

"It's okay to fail, it's more important to fail and figure out what you're doing right than to grow without failing. I'm sure you will. I'm sure.

"I'm sure.

It's so cute that she's tilting her head... it makes me wish I had a child.

"I'm sure is fine. Okay, let's get to work! I'll start the fire and burn the shells until they're white! It's going to be hot, so don't touch the furnace, and we've tested it, but the furnace is made of stone, so we don't know what the heat will do to it. If you see any cracks or anything strange, stop working and step away from the furnace. "Yes!

"Yes!

And so, little by little, the work progresses.