Several planes of different shapes flew by, and I was curious, but I saw an airship floating underneath.

"I've seen it in the art books," I said, "a magic airship where humans and goblins work together!" ”

Leo said: "Actually, it can be achieved with air buoyancy alone, but it is more convenient to add magic, and I will see it when I have the opportunity in the future." ”

The perspective continues to go down, slowly approaching the sea: "Look at the 10,000-ton giant ship and the offshore platform, and then take you to see energy extraction and fishery, after all, your shipbuilding level is too low......"

I said, "Now I'm suddenly interested in your military and medical work." ”

"Wait a minute," Leo said, "the title of the film is The Birth of the Universe, and it would be a lie to jump to medical and military at once, so it's better to finish watching the earth first, and then talk about other ......."

As he spoke, the earth on the picture began to pull away again, and then, it was cut open by an invisible giant blade like a melon.

Thus, the interior of the earth is presented in the preface.

The mountains and the ocean can be clearly seen on the face, but it is only a thin layer, and the deeper you go, the rocks and mud are gradually replaced by orange or even blood-red magma.

The core of the earth is a magma ball!

I looked surprised, and then thought of a bunch of questions, but Leo gave a partial answer directly in the picture - some magma rushed out of the ground along the cracks in the earth and mountain peaks, forming a volcano.

Still, I asked, "If our planet is also a lava core, then is it possible that the Demon Hell and the Abyss Plane are underground?" But in this case, where do those dungeons, underground ruins, and underground creatures live? ”

Leo seemed to have anticipated my question, and said: "First of all, you still don't know enough about the scale, don't look at the earth's crust is just a thin layer, in fact, the average thickness is nearly twenty kilometers, and the thick place is even fifty kilometers, and your planet is larger than the earth, it will only be thicker, so it is not uncommon for the earth part to reach a hundred kilometers, then, the height of an underground city can reach several hundred meters is already very high, more than a thousand meters is not possible, and when we finish learning here, we will go to the dungeon or the heterotopic plane to see, As for hell and abyss, it may be underground or on a planet close to the star, this also needs to be verified by us, don't worry, let's talk about the core of the earth, the main component is iron, so there is a magnetic force, there will be north and south poles, the north and south poles of your planet seem to be oceans, but there are also ice caps, then go and see ......"

I said, "I see, after learning this, you still have to go through the entire main plane and the different planes......

"The search for the truth, the pursuit of breakthroughs, that's basically it," Leo said, "the more you stay in one place and don't leave, the more limited your vision becomes, and even short-sighted!" ”

I said, "Okay, let's change the subject." ”

Leo said, "Go back to the ocean, and then talk about medicine, and show you how we can heal and save people without priests." ”

"Ocean, what does it have to do with medicine?" I watched as the earth zoomed in again, and the ocean in the cut section continued to enlarge until it took up the entire screen, with corals, seaweeds, shrimps, crabs and other creatures appearing in the water, and huge ships floating on the surface of the sea.

"Look at the iron ship first, in fact, it is also a simple physical principle, that is, the law of buoyancy," the ship in the picture is dissected, revealing the space of the cabin, Leo continued, "The larger the volume of water discharged, the greater the buoyancy obtained by the hull, this is just the basic principle, the operation is really much more complicated, first of all, the material of the hull needs to be extremely tough, but also corrosion-resistant, at the same time, the cabin also needs to be divided into many small compartments, so that even if one part of the cabin is broken and enters the water, the other parts can still provide buoyancy." And also...... Well, I said hurry up, let's talk a little bit about the basics of naval warfare, which is mainly based on artillery bombardment, and basically will not get close to hand-to-hand combat......"

Although I wasn't very interested, it was related to the military, so I took notes.

The scene then cuts to underwater.

"I'll omit the knowledge of marine life, and I'll talk about it later, let's look at the smallest creatures first." Leo seemed to sense my impatience, and the image quickly zoomed in, "Plankton living in the sea is basically the same thickness as your hair, or even smaller......"

The plankton in the picture is strangely shaped, and there is an extra "hair" as thick as a temple pillar next to it for comparison.

Then, next to the plankton, even smaller creatures appeared, and all of a sudden, the plankton became bigger than an elephant, and the little thing was smaller than a bug.

"This is a microorganism, the actual size may be smaller," Leo said, "it is a basically certain fact that life originated in the ocean, and microorganisms are the basis of everything, they continue to evolve, and there are all the later creatures, don't be surprised, the ancestors of all creatures should be these little things, you may not be the same in your world, that is also the subject of future research, saying that microorganisms, for example, you have lice and fleas on your body, and microorganisms are equivalent to lice and fleas on lice and fleas......"

"I didn't!" I say.

"It's not that I taught you hygiene," Leo said, "but to use an analogy, don't get excited, in essence, the origin of living things is the accidental polymerization of atoms and molecules to form organic molecules, and then the organic molecules coalesce into simple single-celled organisms...... I'm not talking about this process in a very detailed way, that's pretty much what it means. ”

The microbial "single-celled organism" on the screen turns into an irregular circle and moves, swallowing some of the tiny particles around it.

Then, the single cell divides into two, four, eight......

"Single-celled organisms evolved into multicellular organisms, and then there were various organs, and the evolution of organisms began." Leo explained, "That's probably what it means, I'm also watching anime......"

The multicellular organisms on the screen divide into several pieces, some with tentacle-like hairs, some with thorns, and some with flowers......

Then, these multicellular organisms evolved into animals and plants, among which the animals first came to land with various strange shapes of fish, insects, shrimps, snakes and turtles.

"When sea creatures land, evolution is even more exciting!" Leo said.

On the screen, all kinds of animals that look familiar but look like nothing hunt, chase, rest, and reproduce, and soon crowd the land.

"It's a long evolutionary process, about a billion years," Leo said, "but the ancestors are all in the sea......

I looked at the beasts on the ground, the birds in the sky, the tiny insects, the fish, shrimp and crabs in the sea, and I couldn't help but ask, "No wonder you also believe that the sea race is earlier than the land race......

"No, no, no!" Leo denied it repeatedly, "I'm showing you our earth!" ”

As he spoke, some of the huge lizards that looked like dragons in the picture book fell down in pieces, and the land was covered with thick ice, and soon the ice and snow began to melt - I know that a long time had passed - and then an animal that looked like a mouse and a wolf appeared, and this animal actually divided into several different offspring, one of which was a monkey.

Then the monkey stood up, shed its hair, and became a human in animal skin.

This is the origin of human beings on earth.

It's a bit like the humans of our world.

"That's the rough origin of life and humans on Earth, and I've skipped a lot of details, what mass extinctions, ice ages, great droughts, oxygen poisoning, and so on." Leo said, "From this line, it is difficult for me to deduce how you came to accept people......

I said, "I think it's easy to understand, you humans evolved from monkeys, we minotaurs, werewolves, kobolds, like people and deer people, aren't they all the same?" ”

Leo said: "This involves the details of evolution, and I really can't think of any point in you keeping horns or claws, hooves, tails or something, but maybe there is a deeper meaning in it that needs to be ......."

I rushed to say, "Need to dig deeper, huh?" I know, but I have new questions, your myths also firmly believe that man was created by the gods, and what you are showing me now should be discovered by scientists later, so those myths have completely lost their meaning? ”

"Quite the opposite!" Leo shook his head, "There are still many stubborn people who can't accept it, and even, some scientists believe that if living things were really created by God, then, God did not directly create all species, but in the first ocean, made the most primitive organic molecules, or the first single-celled organisms......"

I nodded: "Quite possibly!" ”

"There are also scientists who speculate that the god who created organic molecules or single-celled organisms may also be creatures from another planet......

I said, "Is that why you suspect that our gods are also aliens?" But who created them? ”

Leo smiled: "Maybe it's something like the creator god, maybe it's the will of the universe itself, or what is it called the first driving force, at this point, just guess it, it's difficult to confirm anyway, but then again, the structure of the human body, you should also be clear, the smallest unit is a single cell, countless cells with the same function are combined to form tissues, and different tissues combine into organs, organs include bones, skin, internal organs, brains, etc., plus circulating respiration, blood flow, lymphatic system, ......"

The people on the screen were suddenly cut open, and the words in Leo's mouth were separated one by one......

I was a little surprised, but Leo said calmly, "Remember the story of the founder of Santas?" In the era of the germination of science on the earth, there were also people who did this, completely dissecting the human body, and only then did they completely understand the structure of the human body, and before that, it was a big rebellion to do so! ”