In the 40th year after the loss of Emperor Zhiliman the great, some navigators discovered the "new world" with abundant products in the far west.

Seven years later, the first traveler from the east landed in the country of Tang in the Far East, proving that the world is round and the whole world is a body. They brought crops such as corn, potatoes, pumpkins, tomatoes, tobacco, and cocoa to Tang. They also obtained a large amount of expensive silk and porcelain, which could be shipped back to Europe. Since then, there have been ocean caravans...and pirates.

More than a hundred years ago, Sardinia got a batch of cotton seeds; and three years ago, a Frank discovered a magical tree in America—a white-like liquid dripped from the cut of the tree. . It hardens and turns black when exposed to air. The local aborigines use the whole piece of this gum to make boots. After being smoked, it looks like leather, but it can be used for waterproofing. And latex coated on canvas, can also be made into anti-cloth.

The Franks did not collect cow intestines on a large scale to make airship balloons, but shipped the canvas to the Americas, treated it with water, and then shipped it back. The cost is much lower than using cow casings. And at the beginning of this year. This new product also began to spread to Sardinia. Because Frankish scholars failed to discover the technology of stabilizing white latex in a liquid state for a long time, and latex is very easy to condense naturally, the rubber shipped to Europe was made into bottles or shaped black solid rubber by local methods.

A tailor from Sardinia came across a bottle of raw rubber by chance. He tried to cut the rubber into sections like sausages, and then used a rotary knife to cut out a circle of rubber rings.

Then, he selected a raw rubber strap with a moderate length and thickness, and sewed it on the cuffs and glove cuffs of the clothes to make it more elastic, and it can be fixed on the body more firmly without the need for heavy straps. superior. Later, he used this technique to make garter stockings, suspenders, and thick cloth dresses with elastic bands, becoming the first master tailor in Sardinia under the age of 30.

When Leonardo heard the news, he had the clothes he made bought at a high price, and it was confirmed that he was using rubber belts. So Leonardo met him once. A deal was struck, and Leonardo immediately set to work designing and building a prototype plastic mixer—a machine consisting of two cylinders. The outer side of the inner solid cylinder and the inner side of the outer hollow cylinder are densely covered with sharp cutting gears. It can be driven by any power, as long as the two circles rotate in opposite directions, the rubber can be shredded. And according to the special properties of rubber. Over time, it takes more and more force to turn the machine, eventually resulting in a homogeneous mass of solid rubber. This is the plasticizing process of raw rubber. Although not very efficient, at least it works.

If this rubber block provides enough extrusion force, a large section of rubber strip can be obtained. It is cut into rough shapes and squeezed in a high-pressure metal container to get rubber blocks of any shape and size, including tires. In addition to generators, Leonardo has been busy recently with the advancement of the rubber industry.

He probably knew that rubber could be used to make items such as tourniquets, bandages, gastric irrigators, ice packs, and catheters. Or it can be used to make rainproof materials. For example, the tarpaulin on the top of the carriage, or the soles of shoes and boots, etc., make people walk elastically. In addition, if very fine and high-strength rubber threads can be obtained, special products with strong elasticity can be made with them. Or it can also be used to make erasers... This is one of the creations that are easy to make and extremely versatile. Leonardo just used the first batch of industrialized rubber products to make the tires of the first three-wheeled motorcycle in history.

This motorcycle is actually relatively mature. Its engine has five horsepower, the streamlined casing is made of solid metal, the seat cushion has hard spring decompression, and has a brake disc. If it is not for the safety of passers-by, Leonardo also wants to add Metal spikes, or hanging shooters on both sides... Of course, he has reserved space for adding accessories in the design drawings. Leonardo even thought about whether to transform it into a mobile cannon or a mobile grenade launcher. But he thought about it again, and finally gave up the terrible idea.

But even so. The motorcycle and the tank are basically not too different. In the foreseeable future... maybe before Leonardo's life is spent, he will be able to see someone invent the tank. certainly. Before that, someone may invent the car first. After all, he has already made the generator, but the battery is not ready yet. Just one chance. Leonardo can commercialize it... At that time, he will be the first to introduce electric ignition technology. After the high-speed internal combustion engine has been perfected, automobiles can be manufactured. If Leonardo had nothing to do at that time, maybe he could make the car himself. However, with this kind of mature motorcycle as the technology front, Leonardo does not need to waste precious time on such things.

That's right, it's a waste of one in Leonardo's view. Anything unnecessary. Inventions that other people can certainly make quickly, and he is not in a hurry to use. It can be handed over to other people to do it. It's an almost total utilitarianism of a certain convention he's been holding.

The so-called "utilitarianism" does not refer to people's selfishness, or the desire to obtain material short-term benefits. Rather, it says, "For human beings, the attainment of happiness is his main purpose." Then, if this moral law is extended to all people, it can be concluded that making a group obtain long-term happiness should be the responsibility of its social organization. maximum target.

But there is no perfect law in the world. According to Arrow's Impossibility Theorem, it is impossible to satisfy everyone forever. There should be a way, then, by which man can attain the "greatest good" he can attain. line, even if it might cause additional suffering to some populace of the day.

Starting with King Solomon, Leonardo has pursued a similar idea... only his ideas are more extreme. Because he stubbornly wants to "make everyone happy". If that is not possible, rather than making "most people happy now," let "everyone in the future be happy."

He is such a stubborn man who admits death.

In his last life, Baimon once asked Charles, why did he do something that seemed thankless at the moment?

After thinking about it for a long time, Charles told Baimon a story: "No matter what possible route light takes, it will take longer than the route it actually takes. That is what I once wrote , light takes the shortest path' this principle.

And if the light is a man, then he must know everything. Know everything before you set out to take the shortest path. No matter what adjustments he makes on the road, the road he takes cannot be the shortest path.

"I am the light.

He said: 1 Although there is no need to be so extreme, it is always better to make human beings less detours.

This is the love of Charles, and it is also the love of Leonardo. He loves everyone in this world. Even love those who despise the people. So strictly speaking, Leonardo does not belong to any class... He belongs to the destiny of all human beings, to all the people in this world.

If there is no light in this world, he will be that light.