Walking into the world of underground caves, there are fluorescent grasses emitting light, but they still make the underground caves look dark.

In such a dark environment, most creatures in the cave have evolved night vision.

Walking in the underground cave world, Su Ming felt uncomfortable.

In this environment, hearing is more important than vision.

"teacher……"

Su Ming expressed his doubts: "How many human populations are there in this world?"

"Some experts estimate that the population of human race is about 2 billion!"

The blonde lady said the data.

"This planet has a diameter of 1.5 million kilometers, and 30% of the area is land. The land area is so huge, but the population is only less than 2 billion, and the population is too small!" Su Ming frowned and discovered a loophole in this world.

In his previous life, the earth had a diameter of 1.20,000 kilometers, but it carried about 8 billion people.

But the diameter of the blue star is 1.5 million kilometers, and the surface area is more than 12,000 times that of the earth. But the people are only less than 2 billion, and the population is too small.

Too large and sparsely populated.

This population size, scattered on the planet, is easily submerged.

"Wait a minute, how do you know that this world...is a planet?"

The blonde lady asked, her eyes flashing with horror.

"Is this question difficult? Almost common sense!" Su Ming smiled and listed it in some ways to prove that the world under his feet is a planet.

"How did you know the diameter of the planet?"

The blonde lady asked in a deep voice, her face gloomy.

Su Ming smiled and said, "Teacher, this is basic common sense. It is not difficult to calculate the diameter of the blue star, the distance from the sun, the distance from the silver moon, and the purple moon, and it is not difficult to calculate the mass. You can use the law of universal gravitation!"

As he said that, he calculated the diameter of the blue star, the diameter of the sun, the silver moon, the purple moon, their distance, mass, etc.

These are all high school knowledge and are not profound things.

After traveling through time, especially when practicing "Catalog of Stars", Su Ming's memory is getting better and better. This benefit is to remember many things that I forgot in the past little by little.

For example, I have seen Dream of Red Mansions, but afterwards I can only remember the general plot, the outline of the story, as well as the specific plot, and the details.

For example, what a junior high school teacher once told me was not flipped for seven or eight years after graduation, and I have forgotten it.

For example, when I read the equations, specific data, models, etc. of nuclear weapons in the library, I forgot about it.

But now my memory is getting better and better. I can recite Dream of the Red Chamber word for word, remember what the teacher said word for word, and even the data, physical formulas, etc. I can remember them word for word.

"Don't tell outsiders these things, do you know?"

A long time later, the blonde lady said: "Some of the things involved in this involve the authority of the gods and the secrets of the gods... If they are exposed, they will be chased by the court."

Su Ming nodded subconsciously.

"The gravity here has increased, and the gravity is at least five times..."

Su Ming felt the cave.

The gravity here seems weird and abnormal.

"Why did you enter the cave?" The blonde lady held the sword in her hand. In order to avoid the sword's reflection, she directly applied black paint to the steel sword, and could assassinate silently.

"Enter the world of underground caves, find various kinds of magic potions, spiritual medicines, magical fruits, and kill the underground cave people, hone their martial arts skills, and transform themselves in the battle of life and death, in the life of death, and achieve the sublimation of life, and constantly approach the limits of the human body!"

Su Ming said proudly.

Entering the cave world is to play games, brush dungeons, and fight small monsters.

In the monster-scraping, the experience bar is improved, the blood bar is improved, and the blue bar is also improved, and then it is continuously upgraded.

It has died in the game, but krypton gold continues to fight.

But if you die in the real world, you really die.

Life is only once.

"Don't read the knight novels. There are many twists, enlargement, and unreal plots in the knight novels!" The blonde lady said, with contempt on her face: "Knight novels, for the sake of being written happily, often have cool plots. For example, the knight swept across a cave tribe with one person; there is also a story about a knight killing the dragon and saving the princess."

"But these plots are all fake, they are all deceiving civilians."

"On average, one knight was born in human society. But in the world of caves, as long as the cave people reach fifteen years old and adulthood, they have the strength of knights. The areas where the cave people live have the gravity of five times, and some areas even reach seven times, which leads to their physical strength being very strong, far exceeding the physical fitness of humans."

"In the duel of the same realm, human knights are not the opponents of the underground cave soldiers. At least two, or even three, can they surround and kill one underground cave soldiers."

"Even if it is a small tribe of the underground cave people, there are more than 100 underground cave people warriors, equivalent to more than 100 knights... Even if the black iron knight rashly breaks into the underground cave people tribe, he will be surrounded and killed."

"What makes the human race strong is unity and formation... One caveman can easily defeat a human knight, ten cavemen can easily defeat ten human knights, but one hundred soldiers can only barely defeat one hundred human knights, but one thousand cavemen will definitely defeat when encountering one thousand human knights."

"If ten thousand human knights gather together, they can easily defeat the 50,000 underground cavemen army."

Speaking of this, the blonde lady said earnestly and inspiringly: "The human race is strong in unity, and there is constant internal struggle in normal times; but once it encounters foreign enemies, it is unprecedentedly united. When it comes to individual combat capabilities, human knights are the worst and physically the worst; when it comes to unity and cooperation, legion combat, humans are the strongest."

"In the human knight's law, after entering the cave world, knights are forbidden to show off their personal heroism."

"When you arrive at the world of caves, your main purpose is two. The first is to adapt to the environment here, be familiar with some plants, insects, animals, and some magic potions, be familiar with the living environment and social structure of cave people. The second is to use the five times the gravity here to squeeze the human body's potential and approach the limit of the human body!"

The blonde lady changed her color: "In the college, she talked about subjects such as plant classes, potions classes, insect classes, geography classes, etc., mainly theoretical classes, and she was absent-minded in class. But now when she was in the cave world, I wanted to conduct field courses, and the performance here will be recorded in the archives and sent to the school."

“Based on the performance of these courses, you will be given the corresponding credits!”

"As a teacher, I will strictly implement the college regulations and will not give students any possibility of cheating; as a student, you must also strictly attend classes and study hard. If you fail the exam here, you may die."

...
Chapter completed!