The World Tree soared into the sky, its round branches like giant umbrellas, shrouded in the clouds. The entire tree was covered in branches and leaves that shone with golden brilliance, and judging from the proportion of the World Tree's size between heaven and earth, each golden leaf on it was larger than the area of Frank City.

The sea of tama trees at the foot of the World Tree was originally much larger than the realm of the Sophia Kingdom, but compared to the miracle formed by this towering ancient tree, it was like an insignificant small lawn.

The students in the classroom were silent, all of them were shocked by the grandeur of the World Tree.

With the glass curtain wall as the background, Jeffrey with his hands behind his back, continues to explain:

"Not long after the War of the Gods, under the nourishment of peace, the human race on the earth gradually prospered, and different civilizations established various forms of government, including our kingdom of Sophia. Next, the history of Diria officially entered the "Age of Divine Concealment".

The goddess Thea has not appeared in the eyes of believers for an unknown amount of time, and some say that she was coerced by Mira and died together. Some say she is now at the top of the World Tree, gently looking down on her people. It is also said that Thea was taken away by the supreme will and traveled to the universe. In short, in the age of divine inclusion, people's self-consciousness gradually awakened, and many scholars formed a new worship of ether technology. Especially outside of the kingdom of Sophia, where the belief in Thea was not so strong, this characteristic of the times was even stronger.

So, do you know what is the landmark event that opened the Age of Divine Concealment? ”

"I will!"

"Me too!"

……

The students' eyes lit up and they raised their hands and replied enthusiastically:

"Aether technological revolution!"

Jeffrey looked at the young man in the audience, and in the face of such a fanatical look in the aether technology, a flash of loneliness flashed in his cloudy eyes.

“…… That's right, it was the Ether technological revolution initiated by the University of Actor. This revolution completely changed the whole of Diria. Among them, various inventions such as magic guides, ether crystal appliances, and high-pressure steam airships were born, and we were able to practice the aether sequence, and even leisurely admire the World Tree from the top of such a tower, all thanks to this technological revolution, and the first core milestone invention was the ultra-high-pressure steam engine. ”

Jeffrey fiddled with the lever on the podium, and a ring arm somewhere above his head, with a steam clatter, slowly descended in front of him.

He staggered over and laboriously removed a regular-shaped polyhedral device from the root joint of the robotic arm.

The device, which is the size of a football ball and has a hexagonal prism on each side, is so intrigued that it looks like the neon ball Charlotte had seen on the dance floor of a bar in her previous life, with dense steam relief valves all over the surface.

"Aether crystals are precious minerals born on our planet, and we all know that they contain great divine power left behind by the ancient gods, but we have never understood how to use them. Until Professor Julius of the University of Actor invented the high-pressure steam engine consisting of crystals. The principle of this device is to forcibly compress the unusually large volume of steam into a small device through the power of ether crystallization, and the high-pressure steam will produce surging kinetic energy in the process of depressurization......"

Jeffrey said, placing the football-shaped engine on the ground, aiming the pressure relief valve at the sky, and gently flicking a small opening.

Boom –

A deafening loud bang was heard, and a pure white high-pressure steam erupted from the pressure relief. The steam shot into the sky like a volcanic eruption, forming a funnel-shaped jet area about 100 meters high in the canopy above the classroom.

A cloud that floated above the classroom had been pierced by steam from the center and quickly collapsed. The funnel formed by the high-pressure steam quickly formed into a solid frost, and under the refraction of the sun, it was like a sky full of stars, which vaporized and dissolved gorgeously.

At this time, the floor under Jeffrey's feet, where the engine was placed, was already visible to the naked eye.

Jeffrey cautiously crouched down and closed the pressure relief valve.

Charlotte knew in his heart that it seemed that the development of the world's industrial civilization was also boiling water, but they boiled the boiling water more extremely, and it was difficult to achieve such a violent ultra-high-strength compression of steam during the industrial revolution in the world before him. So soon, in that world, electric motors and internal combustion engines became the main means of drive.

Jeffrey also seemed to know the strangeness of this compression, and he sighed:

"Although those fanatics who worship aether technology are becoming more and more disrespectful to the fading gods, have they not thought that the basis of all our scientific inventions is based on the supernatural divine power of aether crystals, which should not exist in the first place, so are they enjoying the gifts of God while denying the existence of God itself?"

After all, Jeffrey is an older generation, and his words have accumulated a lot of insights over the years, which also triggered the thinking of the students in the classroom.

Charlotte can somewhat understand what he is trying to say, just like when people first studied the field of quantum mechanics and found that many laws in the macrocosm were completely broken in the microcosm, it was a feeling of complete collapse of the worldview. The foundation of all of Deria's scientific inventions is based on the crystallization of divine power, and this feeling is indeed very subtle.

Behind Professor Geoffrey, the Golden World Tree, which symbolizes miracles, is in stark contrast to the telescopes, robotic arms, and engines that symbolize science in the distance, which makes Charlotte's heart swell with sighs and surges.

This is destined to be an era of intertwining gods and demons and science, and he is full of expectations for the journey ahead......

After class, Charlotte shook hands with Professor Jeffrey to say goodbye.

"Today, in order to show you the World Tree, I activated the telescope in violation of regulations, and the cost of each steam pressurization is not low, and it is estimated that the school's budget committee will come to me for tea and talk to me again."

Professor Jeffrey said with a wry smile.

Today's explanation is of great help to Charlotte to understand the world. Charlotte naturally reciprocated the favor and nodded:

"When I have time in the future, I will exchange with the professor about micro-expressions and the superficial knowledge of reconnaissance, and please don't dislike my class for getting an axe."

"How can it be, I can't ask for it." Jeffrey's eyes lit up, he rubbed his hands, and said, "Why don't we exchange some fur stuff now?" ”

"It's fine." Charlotte was silent for a moment, then said thoughtfully:

"Professor, the next time you go to that river, I don't think your fiancée's ghost wants you to really jump."

Jeffrey's pupils suddenly constricted, and he subconsciously took a few steps back, directly hitting the podium behind him.

"You...... When did you find out? ”