It's evening again, and Li Wei and I have classes at the university in the dream world tonight. Qi Peng is also in this university, he has never been to college before, so come to experience college life. Dream World Universities are all built on a one-to-one scale modeled after real-world universities. Teaching in the dream world is usually done by teachers from real universities with their teaching videos and AI teachers.

Tonight's class was biology class, and I was once again in a dream. Because the time was a little late, I used the portal directly, and a blue vortex appeared in front of me, I walked in, and after only a few steps, an aperture appeared, and through the aperture, I arrived at my dream school.

This is my ideal school, but unfortunately I didn't get in.

Li Wei was already waiting for me at the door.

She was a very impatient person, and when she saw me, she smiled a little, and then came over with a pull on her face, because she had been waiting for me for a few minutes.

Li Wei and I had just walked into the classroom with the front foot, and the teacher walked in with the back foot.

The teacher looked to be about forty or fifty years old, and looked gentle and elegant. There are no names in Dream University, so the teacher went straight to the point.

"In this lesson, we're taking prehistoric creatures from biology class. First we are going to go to the first epoch of the Paleozoic Era, the Cambrian. About 542 million years ago - 485 million years ago. The biology teacher introduced.

Our vision slowly darkened, and when everything was bright again, we were already on the shores of the Cambrian Sea. At this time, the land is bare, all bare rocks, and the whole world has no life, and at a glance, there is only one color, which is the earthy yellow of the rocks. The water next to it is crystal clear.

"In the Cambrian there was no life on land, but the sea was full of life. Let's go to the sea and observe the creatures of the Cambrian period. After the teacher finished speaking, everyone changed into wetsuits.

I had just entered the water, and the warmth of the sea instantly enveloped my whole body. As soon as you enter the water, your vision is filled with life. At this time, the shallow sea was already occupied by sponges, mollusks and arthropods. The bottom of the sea is full of strange creatures that have never been seen before. Trilobites, the representative creatures of the Cambrian period, can be found everywhere. Qi Peng's eyes widened, is this a creature 500 million years ago? Was this the world 500 million years ago? Life is truly amazing!

"It's really thanks to the development of science and technology that we can see this scene across 500 million years of time and space." I couldn't help but sigh in my heart.

"Now give everyone half an hour of free observation." The teacher said.

Li Wei and I quickly found a trilobite. Li Wei carefully observed the trilobite in front of him, a few centimeters, and was about to reach out and touch it.

Suddenly, a huge strange "shrimp" quickly swam over and bit a trilobite in one bite.

Li Wei's eyes widened, "Wow, what a big shrimp." ”

"This is the odd shrimp, the first super predator on Earth. It can be up to two meters long, and most of the Cambrian creatures were between a few millimeters and a few centimeters long. I explained.

Li Wei suddenly sighed: "This is the cycle of heavenly principles." ”

I glanced at Li Wei suspiciously, "You look at how much its descendants, crayfish, are eaten every year, it's all because its ancestors broke the rules first." Susu said.

"Odd shrimp are not related to our modern crayfish." I explained one more sentence.

Half an hour passed in a flash, and I still had some unfinished business. Afterwards, the teacher gave a detailed introduction to some representative creatures and their structures.

Then we went to the Ordovician, where there were more than 500 species of trilobites, among which Li Wei was most interested in the straight-shelled nautilus. It was the overlord of the Ordovician period and could reach a length of ten meters. In addition to the strange shrimp, Li Wei wants to eat it the most.

Then there's the Silurian period, where the main attraction is the turtle and the bronzo shoes, as well as the sea scorpions. The head turtle has a relatively small body, no more than 20 centimeters, a flat head, no upper and lower jaws in the mouth, and is an out-and-out peacemaker, looking cute and cute, Li Wei has always said that he wants to raise one. There is not much difference between the appearance of the Brondo scorpion and the scorpion we have now, but it is a meter long. When Li saw it, he sighed with emotion, how painful it would be if he stung it with a tail needle. As for the sea scorpion, it is even more exaggerated, and the length can reach 2.5 meters.

Later, we came to the Devonian period, and the Devonian period had already appeared in the earliest amphibians, fish newts. The trilobite here is the largest, with a full 70 centimeters, and Li Wei calls it a trilobite PLUS.

Next up was the Carboniferous Period, and when the light returned to us, we were already in a jungle.

"This is the Carboniferous jungle, when the oxygen in the air reached one-third, the highest level of oxygen on the planet, and now the atmosphere has only 21 percent oxygen. The abundant oxygen content feeds the super-giant arthropods. You can first observe the creatures of this jungle for yourself, and finally I will give you a detailed introduction to several representative creatures of the Carboniferous period. The teacher said.

I took a deep breath and felt refreshed. The trees here appear to be more than fifty meters tall, close to the height of a human twenty-story building. Dense and towering trees obscured the sky, and the sun could only leave dappled shadows through the gaps in the leaves.

I looked up and saw a huge dragonfly flying by and perched on a dead tree, a Carboniferous giant veined dragonfly with a wingspan of up to a meter. Li Wei and I walked over and walked to a place less than half a meter away from it to take a closer look. Li Wei suddenly said, "Do you know? When I was a child, I saw a huge dragonfly flying over my head, I felt close to half a meter, but I told others, they didn't believe it, they said that there is no such a big dragonfly in the world, they said that the largest dragonfly in our world is only 12 centimeters long, and the wingspan is 19 centimeters, or Central and South America. ”

After observing for a while, we walked away to observe the other creatures.

"Ahhhh Li Wei screamed loudly and ran behind me. I followed her gaze and a giant millipede emerged from the grass. The millipede looked like a small car, about three meters long, and its whole body was covered in armor and its body was somewhat flattened.

"This is the giant horse, the ancestor of the modern horse, which can reach up to three meters in length, and is one of the largest arthropods of all time, with few natural predators." The teacher who heard Li Wei's scream explained.

"Ahhhh Li Wei screamed again, this time the culprit was the giant spider horseshoe crab behind him, which looked about the same size as the basin we usually use.

Almost all the creatures of the Carboniferous period made Li Wei let out a miserable scream, except for the three-eyed dinosaur shrimp, she put this small animal in her hand and teased it. Seeing this creature that is still alive here makes everyone feel a little like a world away.

Hundreds of millions of years, so long, but it seems like a fleeting moment.

The Permian period saw the worst mass extinction event on record, with an estimated 96% of the planet's species extinct, including 90% of marine life and 70% of terrestrial vertebrates. We have seen countless lives struggling to survive, some of them have traveled thousands of miles for water, and some have held on to a source of water until it dries up.

Later, in the late Triassic, we saw the dinosaurs that we had been thinking about, but at this time they were not the overlords of this era.

We have finally arrived in the Jurassic period, and the dinosaurs have started an era of their own. During the Jurassic and Cretaceous periods, dinosaurs became the most prosperous species, ruling the earth for nearly 150 million years.

"We're going next to the Jurassic and Cretaceous." The teacher announced with a smile.

The next moment, we were in an open meadow.

"It's the largest ecosystem in the biology curriculum, with an area of 660 square kilometres, and it's home to all the dinosaurs found in the Jurassic and Cretaceous periods, so it's very expensive to develop. It is also used in various films, television, and game materials. The ecosphere is mainly made up of two small islands, one island was home to all the Jurassic dinosaurs, and the other island was home to Cretaceous dinosaurs. There are also a large number of dinosaurs living in the sea. Due to the size of the area, the designers added a ride system that allows you to choose any dinosaur as a mount through the device on your right wrist. The way to use it is very simple, just point the scope of the device at the dinosaur and press OK. ”

As soon as the teacher finished speaking, he used the device on the Aeolian pterosaur in the air. The Aeolian pterosaur slowly flew down and stopped beside the teacher, it was as tall as a giraffe when it stopped on the ground, and its wingspan looked more than ten meters when it flew up. It lowered its head, the teacher skillfully climbed up its neck, and the Aeolian pterosaur quickly flew up, setting off a huge wind wave.

"Wow!" Li Wei grew his mouth.

"Let's go, little Yuzi, go find our mount!" Li Wei excitedly pulled me towards the dense forest.

A loud noise attracted the attention of Li Wei and me. We followed the sound.

Li Wei's eyes widened.

"What kind of monster is this?" Li Wei said in surprise.

In front of our eyes are Argentinosaurs, leisurely eating leaves, giving us the feeling of walking tall buildings, because in our time, there is no other creature on land that can compare to its size. At about 12 meters tall, up to 42 meters long, and weighing nearly 100 tons, Argentinosaurus was one of the largest dinosaurs. Their legs are like the pillars of heaven and earth that support heaven and earth in mythology, leaving a deep footprint on the ground with each step.

After a while, Li Wei and I had stepped on the back of the largest Argentinosaurus. The right-hand mount allows us to easily climb onto the dinosaur's back and stay stable on their body.

We climbed up the neck of the Argentinosaurus to its head and looked down on the world of giant beasts, and I thought of the surprise and shock I felt when I first learned about dinosaurs as a child. Every boy should have dreamed of a dinosaur.

Descending from the Argentinosaurus, we met the most famous and powerful carnivorous dinosaurs of the Jurassic and Cretaceous periods.

"No, no, no, no." Li Wei shook his head. Pointing to the "big chicken" more than ten meters long in front of him, he said: "Impossible, how could the mighty and domineering Tyrannosaurus Rex look like this." ”

The "big chicken" in front of him seemed to hear Li Wei's complaints, opened his mouth wide, and roared at Li Weisheng.

Li Weiwei's face was disgusted, "Wow, its mouth stinks." The Tyrannosaurus rex let out an even louder roar as if dissatisfied.

"It seems that the designers had already thought that there might be similar complaints, and designed the program in advance." I explained calmly. Suddenly, the T-Rex turned its head and let out an even louder roar at me, splashing saliva on my face. I looked helpless, and after a while, complained, "What a boring designer." ”

It took us three nights to walk through all the eras and see the evolution and extinction of countless lives.

After the biology class, the history class followed. The teacher took us to Chang'an City at the height of the Tang Dynasty.

"This is Chang'an City, it is the Lantern Festival, everyone can now do their own activities, walk around, and learn about the customs of the Tang Dynasty. Everything here can be purchased with our currency. The teacher said.

"Is this ancient?" Li Wei was a little incredulous.

It was night, but the colorful lanterns illuminated the whole of Chang'an, and the streets were crowded with people, just like a modern city with bright lights.

After a while, Li Wei and I had already changed into Tang Dynasty clothes.

"Let's go." Li Wei pulled me up and ran, passing by a stall selling rock sugar gourds, she stopped abruptly and stared at the rock sugar gourds.

"This young lady, do you want rock sugar gourd? It's not sweet, you don't need money, just a penny for a string. The AI vendor at the stall shouted.

Li Wei immediately bought a bunch, and the moment she bit it, it was obvious that her eyes slowly turned into crescent moons. Then she looked at this food street with excitement on her face. I sighed.

An hour later, Li Wei finally finished eating all the food. She touched her belly, and I thought to myself, "Is this an understanding of the customs of the Tang Dynasty, or a special snack to understand." ”

There is not much time left, and Li Wei is almost full. We are finally beginning to understand the customs of the Tang Dynasty.

"Let's go guess the lantern riddles! Xiao Yuzi. Li Wei, who was full of food and drink, proposed.

"Okay." I have already accepted my fate.

"In this situation, if you wear another eunuch suit, don't be too suitable for the situation." Li Wei has to make inches.

After a while, Li Wei, who had guessed several lantern riddles but couldn't guess correctly, looked at the gifts of the lantern riddles with an angry face, and finally turned around and left unwillingly.

We walked to the river again, and the flower boats went down the river, and all kinds of lanterns drifted with the waves.

"Let's go put the lanterns, Xiao Yuzi." Li Wei suddenly turned his head and asked me.

"Okay." I certainly have no reason to refuse.

We each bought a lantern, Li Wei held the lantern, squatted down, closed his eyes, made a wish, gently put the lantern in the water, and then slowly pushed, then turned his head and smiled at me. I also closed my eyes and made a wish.

The two lanterns slowly merged with the original lanterns along the river, and Li Wei looked at his own lantern until it disappeared.

Suddenly, there was a loud noise, and when he came back to his senses, the sky had been lit up by colorful fireworks, and Li Wei's eyes were full of light.

"Let's go set off fireworks." Li Wei pulled me up again.