"In the long, dark, and terrifying prehistoric era, with the discovery of the first 'Organ Heaven Map', human beings began to use tools and machines to fight against monsters, ancient cities and gathering areas began to appear, and human beings entered the era of group living, and language, writing, culture and even civilization began to be born. This is in the long history.

"The emergence of various tools and machinery gave human beings a real space for survival for the first time, leaving seeds for the continuation of civilization.

"About 1,000 years ago, an epoch-making energy source, the source crystal, was discovered. With the continuous improvement of the technology of source crystal mining and refining, and the appearance of the 2nd~4th 'Trap Celestial Map', generations of genius traps have been born like stars, creating various trap weapons and large traps that are enough to defend the city and fight against fierce beasts. On the vast road, cities are lit up like stars in the night.

"The birth of all kinds of high-end institutions with source crystal as energy has made the 'organ division' a well-deserved hero.

"The emergence of various source energy organs, especially those with more than 3 stars, has greatly improved the combat effectiveness of the top powerhouses, and the fight against demon beasts has become even even victorious. Countless genius mechanics have emerged, creating one force after another, building cities one after another, and passing on one genre after another...... For the first time, humanity has survived on the basis of a mega-city.

"This is the second organ revolution, known in history as the 'Source Energy Revolution'. ”

In the dim light, Xia Yu held this book of "Popular Mechanism" and read it with relish.

Fortunately, this is a relatively popular journal, although a lot of it is the design and use of organs, but there happens to be an article about the inheritance of genres in a column, which introduces the history of the development of the official version of the organization's civilization at a very long length.

A simple flat and direct description gave Xia Yu a more comprehensive understanding of the world.

"The third organ revolution should be the 'perception revolution'!" Xia Yu said in his heart.

Really!

Although it is mentioned in the article that there is still controversy among different historians about this, the Association of Organ Teachers still regards the popularization of perception as a symbol of the third organ revolution.

The reason for the controversy is that it does not have a clear boundary.

In other words, there is no recognized point in time from the very few geniuses who can have perception and be able to design and use source energy mechanisms, to the vast majority of people who can awaken level 1 or even level 2 perception and the whole continent to enter the era of true source energy mechanism civilization.

But in any case, the popularization of perception below level 2 has brought the source energy organ into the lives of the vast majority of people, and the social productivity - this is of course the word summarized by Xia Yu - has been greatly improved, and all aspects of military, production, people's livelihood and even life and entertainment have all been because of the great change that the source energy agency has begun.

The article is not so uncertain about mentioning that what has been happening in the last hundred years is likely to be the Fourth Revolution of Organs, in which various new theories of organs are flourishing, leading to great progress in the creativity of organs and social productive forces.

The most important of these, the self-cherished mode of research, is being replaced by the emerging academic system introduced by the Association of Institutional Teachers.

After that, it belongs to the introduction of some mainstream mechanical schools and forces.

Except for the Association of Organists and Masters that Xia Yu already knew that his status was almost supreme, the continent was mainly composed of the two major camps of the Federation and the Empire, and other forces such as Lost God Island and the Black Sea were all on the periphery.

However, the distribution and characteristics of the seven major states of the federation and nearly 1,000 large and small cities cannot be completely introduced in the article, and only some of them have an impact on the entire federation.

Sure enough, there is the Song family!

Xia Yu discovered the name of "Iron Ruler" Song Xuan at first sight, as well as the super wealthy Song family he created in the past hundred years.

Like the Song family, the strength of almost the entire state dominates the Zuo family in Xijiang Prefecture, the Luan family in Donghe Prefecture, the Sikong family in Beiyangzhou, the Feng family in Jinglu Prefecture, and the Fang family in Nantuo Prefecture.

The only exception is the Iron Abyss Holy City, where the strongest Yuan Lord in the mainland is located - it does not belong to any state, but it is known as the first male city in the mainland, and it is also the headquarters of the Organ Division Association.

Of course, this article does not mention the situation on the side of the Man Fierce Empire, but Xia Yu has heard of the name of the 6-star powerhouse Man Fierce Emperor, which is an existence on the same level as the Yuan Lord.

And because of the common enemy of the fierce beast, the probability of large-scale war between the two camps is not large, and there are only two times in hundreds of years of history.

"It seems that the overall strength of the Star Federation should be above that of the Fierce Empire. ”

After reading this popular science article that is quite important to him, Xia Yu sighed slightly.

After all, with the loose federation constitution he knew, he could confront the centralized empire, and it must be better overall strength.

"Forget it, these are still too far away from you, it's good to know that the Song family is a super thigh!" Xia Yu laughed at himself.

The reason why he paid attention to this was because he felt that when he followed Luan Zijin to meet the city lord Luo Yi that day, the atmosphere on both sides was obviously a little weird.

Luan Zijin represents Song Qingyun and the Song family.

Luo Yi was polite on the surface, but behind the scenes, he was ......

Maybe he thinks too much, after all, Song Qingyun can't fully represent the Song family, maybe Luo Yi is closer to other sons.

Soon, he turned to another interesting article, titled: "On the Trajectory of the Arrow in the Air from the Source Shooting Crossbow".

"It turns out that at the moment it is shot, the trajectory of the arrow is not a straight route, but follows an arc that rises rapidly but quickly, and the ascent becomes slower and slower until it stops, reaching a state of equilibrium that neither rises nor falls, and then falls suddenly, faster and faster.

"The most important thing is that the trajectory of the rise and fall is completely symmetrical.

"And through the comparative test, we have two surprising discoveries!

"First, whether it's a Cold Maple Arrow, a Refined Iron Arrow, or a precious Aluminum Alloy Arrow, as long as they are fired with the same initial velocity, they travel exactly the same distance in the air per second!

Second, one monk shoots an arrow horizontally, while another monk stands next to him, shooting the arrow from the same height as the crossbow from the source—no doubt the two arrows will land far apart: one will appear hundreds of meters away, and the other will fall directly to the ground.

"However, both reach the ground at exactly the same time!

"In my research, all the great Institution Friars are willing to provide enough case support for this.

"I would venture to guess that the trajectory of the arrow in the air is independent and does not interfere with each other in the horizontal and vertical directions.

"Is this fixed, symmetrical trajectory a dance under the gaze of the gods?"

Because it is a popular publication such as "Popular Mechanics", which is aimed at the vast majority of 3-star mechanics and mechanics, there are various articles in it, and in addition to these popular science, most of them are discussions on some basic theories.

This is the end of the author's experiments and discussions on the trajectory of motion, and he does not design a new mechanism or source array structure based on this, but he also puts forward several ideas.

But it can be published, and it is naturally very valuable.

It's just that......

Xia Yu touched his head, from beginning to end, isn't this article about a parabola?

The independence of horizontal and vertical motion should be the basic property of parabola, right?

It seems that the basic scientific research of this world is really backward......

Xia Yu couldn't help but sigh, and then turned the article back to the first page, wanting to see the author of the article: "Ou Lin, the wearer of the Aoba Divine Emblem, a 4-star organ division, and the Oulin Laboratory of the Federal Association of Organ Divisions." ”

"Aoba Divine Emblem wearer?"

Xia Yu's heart moved, as if he had heard of this statement somewhere, but he couldn't remember it clearly for a while.

By the way, it was Lu Dongyuan who said after drinking once that the reason why Master Qu's status in Luo Tong far surpassed that of other 3-star mechanics was that in addition to having touched the 4-star threshold, there was also a research that was expected to be certified by the Organist Association, become a mechanic and obtain a divine emblem......

So, this purple leaf is the classification or level of the divine emblem?

Thinking of this, Xia Yu immediately turned to the first page of other articles and looked at them one by one.

Sure enough, in addition to green leaves, there are also purple leaves and blue leaves...... Of course, more authors do not have this god emblem title, and directly note the rank and source of the famous organ.

It turns out that this is the certification of the legendary mechanism god master by the Mechanics Association!

And there is no doubt that the proportion of obtaining the Divine Emblem to become a Mechanism Divine Master is even lower than that of a 4-star Organ Master, indicating that this is more difficult and more precious.

Looking at those three-star and four-star mechanics, and the mechanism god emblems, his heart surged for a while, and Xia Yu continued to look through the articles behind:

"Linearity Study of Energy Excitation Periods in Certain Loop Source Arrays";

"Tensile Stress, Elongation, or Maximum Shear Stress: On the Three Strength Theories of Alloy Materials";

"Another Manifestation of Friction: On the Relationship between Fluid Potential, Kinetic Energy and Pressure, and the Attack Efficiency of Physical Remote Organs";

"A Kind of Analytical Idea of the Corresponding System of the Seven Bridges Problem and the Source Energy Operation Circuit";

"Preliminary Solution to Vibration Theory"......

Seeing these strange and familiar words and words emerge one by one, Xia Yu's eyes are getting brighter and brighter.