Green put the "Dragon Star Instrument" in his hand on the podium, and all the Vikings in the classroom immediately stared at it curiously, and then soon someone raised their hand and asked, "Lord Chief, what is this?"

"This is our world. ”

Green turned the orb on the table, pointed to a small area of the sea above, and said, "And this is our kingdom of Navia. ”

There was an eerie silence in the classroom for a moment, then there was a loud noise.

"What about Odin, how can our kingdom be so small?"

"How can this world be round?"

"Fortunately, fortunately, we live on top, and if we are below, won't we fall?"

......

"Hahaha~"

There was a few laughs in the corner, but when Klee turned his head and glared, the goblins immediately shut their mouths.

This is an open class within the Dragon Training Academy.

The lecture was attended not only by the newly recruited trainees, the junior dragon knights of the previous class, the backbone of Dragon Wing City, the leaders of various tribes, but also goblins, gnomes and dwarves.

And this thing, which has long been known to everyone in the Demon Realm Continent, is still too unbelievable for Vikings who know the world for the first time.

Green clapped his hands to silence the cadets.

"The world is round, there is no doubt about it!, because the navigators of the Demon Continent have proved it, they start from one place, then go all the way west, circle the world for a week, and then return to the starting place. ”

The Vikings in the classroom fell silent as they looked at each other.

Green waited for them to think for a while before he said, "There are people living in this world, why wouldn't they fall off this planet?"

Green wrote a symbol "G" on the blackboard behind him.

“...... There is an interacting force between any object in nature, which I call gravitational force. This force increases with the weight of the object and decreases with distance, and the attraction of the planet on us is called gravity. It is precisely because of gravity that people in different places can stand firmly on it, and if we jump off the dragon's back, the direction of the fall will always be towards the ground. ”

Noticing the confusion on the faces of many of the students, Green didn't explain too much. He just wanted them to get to know each other briefly, so that they wouldn't be overwhelmed by the new worldview.

"Do you have a feeling that when we ride on the back of a dragon, when the dragon climbs, rolls, turns, dives, and even accelerates and decelerates, there is a huge force pulling us. ”

The cadets, who had become official dragon knights, immediately nodded, and they knew this very well.

And sometimes when the dragon's flight is very big, they will also feel that their eyes are black, their heads are bloodshot, and their brains are groggy.

"These conditions are also caused by gravity, which is technically called flight overload. Therefore, when you fly on a dragon, be sure to fasten your seat belts, secure your legs, and hold on to the horns. ”

“..... In addition, you will have to train hard this winter, because tomorrow spring we will be out of this sea and explore the wider world outside. We'll probably get to know more dragon friends, and we'll encounter... More enemies. ”

Green said this, and couldn't help but sigh.

The world can't be that good, and through the many understandings of Mary and the newcomers, Green has already understood.

First of all, the last time the pirates escaped, they have been preaching that the kingdom of Navia is full of gold and jewels, and next year when the sea lanes are opened, more pirates will definitely flock to them.

The second is those countries on the Demon Continent where capitalism has risen.

In the period of primitive accumulation of capital, naked violence will inevitably be resorted to. Armed occupation, overseas migration, piracy, fraudulent trade, and the bloody slave trade are just some of the simple and crude methods that have been used in modern Europe on Earth.

Moreover, the Viking Sea still has the raw material of war that they are very eager for - dragon blood.

After thousands of years of hunting and slaughtering, the dragons on the Demon Realm Continent are almost extinct, and finding new hunting grounds has always been a tireless thing for them. If there is now a place closer than the New World, and there are many dragons, there will definitely be a lot of speculators who want to give it a try.

It's not an empty phrase that the weak will be beaten, and Green doesn't want to be the one who gets beaten.

"Lord Chief, it's been snowing every day lately, and our dragons don't like to move, how should we train?" asked a student who raised his hand at this time.

"I've already figured out a good idea of this!" Green looked at the pendulum clock hanging on the wall, "Alright, let's get out of class! ”

......

In order to allow the dragon knights to get enough training in the cold winter, Green immediately thought of the three major artifacts on Earth to train pilots: spiral ladders, fixed rollers, and movable rollers.

These three kinds of training equipment that are simple to make can not only improve the students' spatial orientation ability, strength and courage, but also simulate the acceleration during flight and exercise the students' ability to resist vertigo.

After telling the students how to use it and what to look out for, Green walked aside with the leaders of the tribes.

"What have you learned lately?"

The leaders glanced at each other, their faces a little solemn.

After they learned about it through the alien races on Dragon Tongue Island some time ago, they understood how powerful those countries in the Southern Continent that were once vulnerable.

In a naval battle, hundreds of large ships and thousands of cannons were dispatched.

It was hard for them to imagine what it would be like to be a war scene.

And now the kingdom of Navia has just established a firearms army of 1,000 people, and the construction of several large ships is only half completed.

If those pirates do come back next year, they will not be able to resist with their current strength.

"Don't worry too much, although we started a little late, we have dragons, and we ...... We have other advantages. ”

Green understood why the leaders were the way they looked, because time was running out for them.

But luckily...... There is also the general existence of this plug-in.

"Green, you say, what else is there to do, as long as you can think of it, we will all cooperate with absolutely vigorously. Hyde, the leader of the crows, was the first to speak.

"Yes, we absolutely support it. The other leaders chimed in.

The past has proven to them that Green can always think of a solution at a critical moment.

"It's actually quite easy!" Grimm touched his chin, "gather all the blacksmiths of the tribes, and use the winter to produce more muskets and cannons, and keep building our ships." ”

Don't stop?

The leaders of the tribes had doubts on their faces, it was freezing in the cold, and they couldn't even stretch out their hands, how could they start building ships outdoors?

"Hehe, we found a huge cave under the cliffs of Thor Island, and if we blow open the hole, we can turn this place into a fully enclosed shipyard......"