After Chen Song let go of the hand covering Hong Ying's eyes, he saw that Hong Ying's eyes were red, and the capillaries on the surface of the eyeballs were abnormally thick, as if they were about to burst, and shouted in disbelief: "Atavism!"

Hearing Chen Song's shout, Liu Yiyan also looked at Hong Ying's eyes with a shocked expression, and suddenly realized.

I'm afraid that only atavistic ancestors can turn red and glow!

Hong Ying was directly interrupted by Chen Song's shout, the red in his eyes gradually faded, returned to a pale red state, and asked with a confused face: "What is atavism?"

Yang Hao also said curiously: "Yes, master, what is this atavism?"

Liu Yan Yan asked Hong Ying and Yang Hao, "Do you know the visual difference between humans and other animals?"

Yang Hao thought for a while and said: "Other animals have better eyesight than humans and can see at night. ”

Hong Ying replied: "The eyes of animals can sparkle at night, but people can't. ”

"You're right!"

Liu Yiyan nodded and asked, "Then do you know why?"

Hong Ying shook his head directly.

Yang Hao glanced at Hong Ying and replied with some uncertainty: "Is it that human beings don't have this night vision function?"

Liu Yan retorted directly: "Human beings have the function of night vision. ”

"Master, since humans have this night vision function, why do they still rely on lights?"

Yang Hao couldn't understand Liu Yiyan's words very much.

Since there is a night vision function, isn't it possible to see things clearly at night without lights?

Why don't I feel it at all, and I haven't heard of anyone with night vision!

"Let's talk about biological evolution. ”

Liu thought for a while, and continued: "Human beings are the first to use tools of a group of primates, in the long process of evolution, the dependence on fire and the sun is much higher than that of other animals, many ancient civilizations have taken the sun to the sun or flame as a totem to prove this, human beings in the process of evolution chose fire and light, naturally left the darkness, lived in a bright environment for a long time, even at night there is fire light, so that night vision is no longer a necessary ability for human survival. Over time, it will degenerate. ”

Yang Hao nodded clearly and said: "In other words, human beings do not have night vision, but they have degraded their existing night vision, so the night vision ability of other animals is better than that of humans?"

"Yes, there is no night vision, and it will not greatly affect the survival ability of human beings, so it has gradually degenerated, but there are still about 10% of human beings with night vision. ”

Liu Yiyan smiled: "There are two types of photoreceptor cells in the eye, rod cells and cone cells, rod cells are related to night vision, but human rod cells are not developed, so night vision ability is not as developed as other animals such as cats." ”

"I didn't expect so many people to have night vision?"

Hong Ying, who was listening to the sidelines, was a little lost.

I thought I was the only one with this skill!

Liu Yiyan looked at Hong Ying and said with a smile: "There are many people who have this ability, but because they have been facing the lights for a long time, or they don't use it much, most of them have degraded the day after tomorrow, so the children's night vision ability is very good, but when they grow up, they can't see clearly without the help of lights." ”

Hong Ying immediately breathed a sigh of relief.

Everyone wants to be unique.

If the streets are all over the place, then you don't have a sense of superiority.

Yang Hao asked with a puzzled expression: "Master, since so many people have night vision and the color of their eyes is so easy to distinguish, why haven't you seen it?"

Chen Song interjected: "That's because many people are born with and can preserve the ability of night vision, so the color of their eyes will not change, and those who do not retain their night vision ability will not be able to see it if they degenerate directly." ”

"Then why are my eyes red when no one else sees them?

Hong Ying still didn't understand what Liu Yiyan and Chen Song meant.

Chen Song said helplessly: "I don't know how to describe this, it's probably because your eyes are red because of bloodshot." ”

Now Hong Ying understood.

The feelings are not mutated, but the capillaries on the surface of his eyeballs are congested, and it looks like blood is all over the eyeball.

Suddenly thinking of something, Hong Ying asked worriedly: "Will the congestion suddenly burst the blood vessels every day, and one day will blind my eyes?"

"It's hard to say. ”

Chen Song shook his head, saw Hong Ying's face turned white, and immediately comforted: "But you are caused by acquired stimulation, only related to guns will irritate the eyes, and other times will not cause eye congestion, as long as the eyeballs are not congested all day and night, it is no problem." ”

"That's fine!"

Hong Ying secretly breathed a sigh of relief.

Yang Hao was shocked: "This is not right, if it is congested, then why do Captain Hong's eyes glow?"

"yes, what's the matter with my glowing eyes?"

After Yang Hao mentioned this, Hong Ying's heart that he had just put down was raised to his throat again.

Liu Yiyan smiled: "That's because of the shiny cells of the reflective film." ”

Hong Ying and Yang Hao were directly stunned.

The reflective film can barely be understood, what the hell is this shiny cell?

Even Chen Song couldn't understand what Liu Yiyan meant.

He had no experience with modern medicine, so he really didn't know what these terms meant.

Liu looked at the three of them looking at him with a confused expression, shook his head helplessly, and said: "Generally, night vision is because there is a layer of reflective film in the structure of the eye, which can enhance the light intensity received by the retina, so as to have better vision in a weakly lit environment!" The reason why other animals have stronger night vision than humans is that this layer of shiny cells called reflective film, as long as there is a subtle light into the eye, this layer of cells can reflect the light back, so that the photoreceptor cells have a second chance to capture the light, it looks like the eye is glowing, but in fact the eye is reflective. ”

Seeing that the three of them nodded in understanding, Liu Yiyan continued: "In addition, a small number of nocturnal creatures such as cats also have the ability to sense heat, that is, infrared vision, because as long as the temperature is not absolute zero, objects will emit infrared rays outward, and at the same time, it is easy to distinguish objects with different temperatures in the infrared field of vision, so even if the external light source is insufficient, you can also see, and human beings invented night vision devices according to this principle." ”

"Doesn't that mean that Captain Hong's eyes are like those of a cat?"

Yang Hao looked surprised.

"Yes, compared with ordinary people's eyes, cat's eyes only need one-sixth of the light to see, so Captain Hong's eyes are an atavistic phenomenon, as long as it is related to guns, it will stimulate the eyes to enter the atavistic state, and it fully has the function of night vision. ”

Liu looked at Hong Ying with some envy.

Having a pair of eyes that belong to your field is simply like a tiger with wings!

His eyes are completely retained by talent, and with his own training, he can't compare with the atavistic phenomenon of Hong Ying's already degraded eyes reawakening and appearing on his body.

After all, my eyes know by myself, and now that I am old, my body has aged, and I obviously feel that my eyes are not as good as before, and it is impossible to make further breakthroughs.

And Hong Ying has just awakened, and it is still an atavistic phenomenon that is unique in ten thousand, and he is upright and in his prime, so it can be said that there is a lot of room for growth!

Yang Hao also said with envy: "I didn't expect this atavistic ancestor to be so good, it seems that human beings have degenerated, if only I could return to the ancestor with my whole body!"

Liu Yiyan and Chen Song looked at Yang Hao with strange expressions.

Chen Song held back a smile and asked, "Brother Yang, are you sure you want to return to your ancestors?"

Yang Hao said excitedly: "Yes, isn't that the same as Superman?" I heard that the manpower in the past was infinite, and it could even move mountains and seas, clairvoyance, and the ears ......of the wind."

"You're a kid poisoned, aren't you? Or have you read too many mythological novels?"

Liu Yan was so angry that he shuddered at Yang Hao's head, and shouted: "Let you study hard, now it's all a joke!"

Yang Hao was knocked out of his eyes, he almost shed tears in pain, rubbed his aching braincase, and saw Liu Yan blowing his beard and glaring in anger, he was a little at a loss, and looked at Chen Song as if asking for help.

Chen Song hurriedly spoke out and said: "Brother Yang, I'm afraid you don't have any misunderstanding of the atavistic phenomenon, it's true that you used to have a lot of manpower, but if you move mountains and seas, you are not a human being, you are a mythical immortal figure." ”

Yang Hao secretly glanced at Liu and asked in a low voice, "What is the atavism?"

"The phenomenon of atavism refers to the genetic phenomenon in which certain traits of ancestors appear by chance in an organism. ”

Liu glanced at Yang Hao and snorted: "If you are a full-body atavistic ancestor, then you will grow wings, your whole body will be covered with long hair, and you will also have a tail!"

"That'...... It's so scary, it's not a monster!"

Yang Hao was stunned.

"Or do you think!"

Liu Yan snorted coldly and said: "Don't think that atavism is a good thing, how many years has it taken for human beings to evolve to be like today, although some good abilities have been degraded because they are not used, but the whole is the most suitable for the living environment." ”

Chen Song added: "Yes, Brother Yang, there are good and bad things about this atavism, just like the cucumber we eat, sometimes the top half is very bitter, which is the atavistic phenomenon." ”

Yang Hao and Hong Ying suddenly understood.

If this atavistic return is not good, it will backfire!

Hong Ying thought for a moment and asked, "Then can this atavistic ancestor control it?"

"Not now, maybe later!"

Liu Yiyan thought for a long time before continuing: "Many researchers are studying, according to the theory of evolution, the organs on the human body will gradually evolve or degenerate, this change is inherited from generation to generation, but in thousands of reproductions, there will also be organs that have been degenerated but suddenly reappeared, as if some kind of weak genetic factors that have been suppressed for a long time are suddenly strengthened again, but the genes of the human body are too complex, they will change at any time, too accidental, and it is still a mystery for the time being, uncontrollable!" ”

Yang Hao and Hong Ying nodded again and again.

This is actually a degradation that causes genes to latent and reappear, but when something happens, it will reappear.

Thinking of his eyes because of the atavistic night vision function, Hong Ying's whole body instantly felt indescribably comfortable.

It's good to return to your ancestors, haha!

In the future, night vision devices or something will be spicy chicken in front of you!