After the slides were played, Yu Yifeng's heart was also shaken.

Such an underground magma canal is unimaginable in primitive times! How much work does this entail? How many lives do you need to fill it?

You must know that this is underground, but it is more difficult than digging a "Beijing-Hangzhou Grand Canal"!

Moreover, magma will slowly condense and cool into stone, so after the completion of this canal, it needs to be cleaned and maintained frequently to operate normally, which increases the amount of work......

This large magma river is a carnival of the ruling class and the wail of slaves...... But at the same time, it does feed a larger population, which is a great initiative. The Knicks rarely need food, they don't have a good digestive function, they only get the necessary nutrients through food, and the main energy source is geothermal energy.

Only slaves consume large quantities of food for energy, but this often does not last long......

Other tribes saw the benefits and began to follow suit. But digging the canal required a huge amount of labor, so they went to war to seize more slaves......

Endless scenery, belonging to the sage class and the ruling class......

But from a historical point of view, the slaves were the most sacrificial class, and they used the most rudimentary tools to create epic greatness. The blood and tears they shed are not enough for even a hundred lava rivers to fill!

The ruins of a large lava river lie beneath the city of Thor.

Unfortunately, over time, it has been filled with solidified magma and stone...... People can no longer see it as it is.

The whole slave era lasted for a long, long time, and the work of maintaining the canal, which would kill people, could only be done by slaves.

The dynasty changed, the slaves revolted, and the bloody rain swept in one after another...... But slavery has not changed.

The lava river is a must, so ...... Slaves have to exist, too.

"The social development here is different from that of us humans. Their feudal system and slavery system have always coexisted, and no matter how strong the opposition is, slaves have always existed......"

However, the pace of science does not stop with blood, killing, exploitation and exploitation......

The sage class of the Knicks civilization, that is, the scientist class, has always been beyond the earthly world.

From ancient times to the present, the Knicks civilization's pursuit of wisdom has never stopped. The dynastic change has little to do with the sage class.

Several powerful tribes were united to form states, and wars between states were common, but all rulers were respectful to engineers and scientists.

Without engineers, countries will soon weaken, and without scientists, technology will soon be surpassed by other countries......

The scientists of the Knicks are still making a fuss about magma, wanting to make magma play more roles than just heat.

And just like that, time passed year after year.

War is the best catalyst for science, and existential stress is also an accelerant for scientific growth.

The living environment here is too poor, volcanic eruptions, or earthquakes can easily take a lot of lives, and the protection of a lava river is far from enough, and the Knicks urgently need a stronger industry to fight against nature!

A hundred years have passed, and mathematics, engineering, and mechanics have come into being...... It does bring greater power, making the Nyx civilization even more worshipful of wisdom.

Finally...... The twenty-second great sage in history, "Kang", established a modern chemical system!

Modern chemistry, born!

The birth of chemistry was an unprecedented breakthrough that meant that they had a better understanding of the world's substances.

For the first time, they learned of the existence of oxygen and began to try to create real combustion.

"The first organic burning phenomenon of the Nyx Star was born in the hands of the Great Sage Kang! That is, the wood fibers are burned in pure oxygen. ”

Hearing this, Yu Yifeng was really a little embarrassed.

Only after inventing modern chemistry and understanding the nature of combustion can the Knicks produce a small amount of oxygen, and then take advantage of the combustion phenomenon that humans are accustomed to......

In comparison, how happy are human beings......

How good Mother Earth is for humanity!

But then again, even with the advent of chemistry, the social era in which they lived was still the age of slaves. Much of the work was still extremely dangerous and required the involvement of slaves.

Chemistry didn't change their situation much.

Because the oxygen content in the atmosphere is very low, it is not easy to produce oxygen through chemical means. Even with industry, extracting oxygen from the atmosphere is extremely complex and costly because of the low oxygen content.

Especially...... Oxygen, which is toxic to them!

Chemistry, so far, has not been of much use...... At best, it has improved the lives of the wealthy class, but it has not fundamentally changed society as a whole.

But the emergence of chemistry was indeed useful, and it also promoted the development of a large number of subsequent sciences.

Until......

Three hundred years later, the twenty-fifth great sage "Tilarn" discovered the phenomenon of electromagnetic induction.

An all-round breakthrough began.

A historian of the Knicks civilization excitedly recorded in his historical writings: "It was an ordinary day, and an unusual day, when a loud noise came from the magma river, and then everyone in the city heard a frenzied shout......"

"Geothermal energy generators, in this world!"

This giant of science actually invented a geothermal generator based on the phenomenon of electromagnetic induction! This is a truly dramatic change in society as a whole!

“…… Electricity is a magnificent giant light, which suddenly appears in the underground world, it only takes three years to grow from a baby to a giant, but it directly chokes the throat of darkness! For the first time, the world seemed so bright. ”

"This invention of the Duke of Tillarn has rightfully earned him the title of Great Sage, and even the rulers of enemy countries cannot refute it......"

"Even ...... Among the 25 great sages who have ever appeared, it is also the first person who deserves to be deserved! ”

"Electricity, also known as the light of wisdom!"

The age of electricity has come suddenly!

"Like a whirlwind, it swept through the entire underground world with a roar! The darkness fades, and the Knicks civilization is reborn, opening a new era! ”

"A great era!"

When I heard this, all the humans present were excited.

At this moment, they seem to have incarnated as Knicks, witnessing the whole process of a civilization from weakness to rise.

Although the sad end of this civilization is doomed, at this moment of rise, people are still excited about it.

This is an eagle spreading its wings and breaking out of its cocoon into a butterfly!

It is a kind of emotion, a wonderful beauty brought about by the progress of civilization.

Species are different, but emotions are the same, and each species has the right to pursue a better life.

From them, people seem to see the shadow of their own rise. From the Renaissance, to the Enlightenment, to the birth of modern science, every bit of human progress has not come easily. The people here are moved by their own progress and the dedication and efforts of the pioneers.

And the history of the Knicks civilization is heavier and more depressing.

It's not that human beings have not experienced such a cruel stage, but every moment in the history of the Knicks is experiencing cruelty.

And the advent of electricity is really as warm as the newborn sun.

They finally see that something called "hope" is being born!

They can finally get out of their energy scarcity.

They can finally stand up in a world without flames!

A machine called the "geothermal steam generator" began to spread widely, stopping the rulers of its spread...... Directly sent to the guillotine by the rebel army!

This is an unbeatable trend!

Magma is still magma in essence, and it hasn't changed much, but at the moment it has one more function...... Generate electricity!

"Geothermal steam generators", just like human thermal power stations, can convert thermal energy into electrical energy through steam. It's a small extra step, but a huge leap in productivity.

Magma can indeed provide a huge amount of thermal energy, but thermal energy is a kind of energy source that is not very easy to use for industry.

And the magma is emitting heat all the time, causing a lot of waste.

If it is used to generate electricity and build a large-scale power station, the energy that can be used will not only increase by more than 100 times?

The electricity age of the Knicks civilization developed extremely rapidly, and electric energy began to quickly replace the original magma heat energy and become a stronger energy source.