The fantasy world and the science fiction world are two completely different systems, and this Ye Yun has a deep understanding. For example, if the science fiction world wants to train steel, they first want to build a steel-making furnace, and then they can start steel-making, but the fantasy world doesn't need it, they can easily make the temperature of the flame reach a very terrifying level without using a steel-making furnace, and even they don't need fire to directly extract steel from the ore, and now Ye Yun is doing this.

In the past three years, Ye Yun has spent most of his time studying various herbs, the medicinal properties of ores, and various talismans and formations in addition to cultivation. Although most of them are reading books and have no actual operation, they have also accumulated a lot of knowledge for him, and refining an iron ore is not easy to catch.

In fact, the reason why Ye Yun learned this knowledge was not only to pass the time, but also to prepare for his future path, after all, he was a person who had to shuttle through the heavens and all worlds, if he didn't have some eyesight, even if he put Baoshan in front of his eyes, he might not be able to recognize it, so in addition to cultivation, he also planned to become an alchemist, refiner, and array mage.

Ye Yun's idea was decided after careful consideration, after all, he would not stay in just one world, and in the heavens and worlds, each world has its own different characteristics, that is to say, the things in each of their worlds have unique characteristics, and he can shuttle through the heavens and all the worlds, if the elixirs and immortal treasures of various worlds are mixed together to refine the elixir, it will definitely have a miraculous effect, and if he wants to do this, he can only rely on himself, Because it was impossible for him to keep an alchemist or refiner with him all the time, and if he handed over herbs, strange things, and other things to alchemists or refiners from other worlds, they might not be able to understand those things, so he could only rely on himself.

And the most important point is that cultivation is actually cultivating the mind, cultivating the Tao, and what is the Tao? Lao Tzu's Tao Te Ching says:

There is a mixture of things, born from nature.

Lonely, independent and unchanging, Zhou Xing without dying, can be the mother of the world.

I don't know its name, the strong word is called the way, and the strong name is big. The big is gone, the past is far away, and the far is reversed.

Therefore, the road is big, the sky is big, the earth is big, and the people are big. There are four major domains, and people live in one of them.

Man is the law of the earth, the earth is the law of the sky, the heaven is the law, and the Tao is the nature.

What does this mean? The explanation that Ye Yun saw was like this:

There is a thing that is one and the same, and it existed before the appearance of heaven and earth.

Silent, empty and formless, it exists independently and does not change, it runs in a cycle without stopping, and can be used as the mother of all things in the world.

I didn't know its name, but I reluctantly called it "Dao", and then reluctantly named it "Great". It is vast and boundless, and it flows endlessly and stretches far away, and it stretches far away and returns to its origin.

Therefore, the Word is great, the heavens are great, the earth is great, and the people are great. There are four great realms of existence, and man is one of them.

What man takes is the earth, what the earth takes is the heaven, what the heaven takes is the "Tao", and what the Tao takes is the state of itself.

In fact, the meaning of Lao Tzu's words describes what he thinks of as the evolution of the universe, that is, "Tao" actually refers to the changes and laws of the world, and the cultivation of Tao is to master these laws for my own use.

However, does this have anything to do with Ye Yun being an alchemist or something? Of course, there is a connection, the essence of alchemists, refiners, etc. is to analyze and master herbs, and the characteristics of refining materials have changed, and these knowledge may just have the "Dao" he needs, and sometimes it can play an unexpected role, after all, the Tao gives birth to one, one life gives birth to two, two gives birth to three, and three gives birth to all things, all laws are different, and there are many roads, and there is always a way to reach the top. As for time, being able to travel through the heavens and worlds is equivalent to an eternal existence beyond the world, so there is basically no problem of not having enough time.

Back to business.

Although the steel is smelted, there are still many impurities in it, and the hardness is not enough. However, this is not difficult for Ye Yun, he has learned a lot of formations during this time, his hand is pinched, and the Dao light flies out of his hand, and it is arranged according to some strange law above the pile of refined steel, and it is soon arranged into a hexagonal mysterious formation. This is a formation specially used to refine impurities, but the level is not high, but this is enough for Ye Yun, after all, he is not used to create divine weapons, he just wants to get some gadgets.

Ye Yun didn't know if there was storage equipment in this world, but he estimated that there should be none, because he found that the people in both the novel and the TV series held weapons, and if there were storage equipment, it would definitely not be like this. And Ye Yun also hated this, because if there was storage equipment, the things he made up would not be one less today, and one less tomorrow.

"It seems that the next world has to find a world with storage equipment, otherwise everything will have to be put on the body, it will be too embarrassing for the traverser." While thinking about it, Ye Yun picked up a fist-sized (adult) piece of steel, used the formation to break him down into small pieces, and then smelted it into the shape he wanted.

More than an hour later, a thing that was seven or eight points similar to the fan in the current world was assembled by him, and in fact this thing was a fan, but the fan in the current world (the real world, the world where Ye Yun was originally located) used electricity to drive the motor, and this magic fan was driven by spiritual power.

Ye Yun looked at this all-steel machine, except that there was no plug and there were many mysterious lines on it, other fans that were basically no different from the fans in the world, and nodded with satisfaction. The fan is already simple, just a motor plus a few capacitors, and now he uses the means of the fantasy world to make it even simpler, even capacitors and motors are not needed, he just engraved a few magic circles on the fan blades and bearing shafts, and then engraved two or three miniature spirit gathering arrays on the base, and then on the knob to get the magic circle to control the transmission of spiritual energy.

After playing with the silver fan from his own hand a little, Ye Yun put him on the ground, and then twisted the knob on the magic fan, and with the rotation of the knob, the silver metal fan blades of the fan whirred, blowing up the long hair on Ye Yun's back.

Looking at this fan formed by the fusion of science fiction and fantasy, Ye Yun's eyes were a little red, "I didn't expect that I had been in this world for three years unconsciously, and I didn't know if you were okay in the other world." ”

After a little nostalgia for the past, Ye Yun continued to do it, he didn't just want to get a fan today, he also had a refrigerator taller, otherwise things would always be easy to break in summer, and most importantly, he wanted to eat popsicles, he missed the time when he froze mung bean ice a little.