I don't know how long it took, Li Xu could only feel very warm. Unable to think, I can only sleep and sleep. The eyelids are heavy and you can't open your eyes. It was as if someone was anesthetized, and it was muddy.

Gradually, you can think about some simple questions. Who am I? Where is this?

The presence of hands and legs can be felt, and they can wave their hands and feet slightly in the dark. You can feel the other body connected to your stomach, as if it was one from the beginning.

The claustrophobic space echoed with a rhythmic heartbeat, and underneath this powerful heartbeat there was a tiny heartbeat.

Time passes, and there are more and more things to think about. kept dreaming, saw his mother's gentle face, saw his father's working figure, saw Yan Maolin's dancing posture, and saw bullet marks in the sky.

You can clearly feel that you are in the water, and you can swim slightly with your hands and feet without paddling. But there is always a feeling that there is a strap that affects the action.

The previously dark world gradually turned orange, and you could even hear talking. Sometimes it's a song, sometimes it's a voice, but I can't remember what it means.

Until one day, I suddenly opened my eyes. I saw that all around me were orange-red, and I saw a pair of small hands and a belt. The space was filled with the sound of two heartbeats, and the sound of heavy breathing.

It felt like the space was getting more and more crowded, and the water around it was gradually becoming cloudy.

Until one day, the surrounding space began to vibrate violently, still contracting rhythmically. Suddenly, the surrounding water drained rapidly, and his head was squeezed violently, and he almost fainted in pain.

"At the beginning, it is very narrow, and only then can it be understood. After dozens of steps, it suddenly became clear. Somehow, this sentence suddenly appeared in Li Xu's mind.

I felt like I was being pulled by my head with both hands, and I instantly felt light and air envelop me.

"Wow!" Cry out loud and take a big breath of fresh air.

In 2333, Li Xu was reborn into this world, and almost at the same time another baby girl was born in the delivery room next door.

In the embryonic form, the number of brain nerve cells is still very small, and Li Xu's soul cannot think. As the brain develops, Li Xu can start dreaming, can command arms, and so on.

From birth to 3~4 years old, the brain increased rapidly, so that a small part of the memory blocked by the previous life could be awakened, Li Xu learned about his previous life, and finally encountered the end of the world, at the moment of the end of the world, someone held himself and was swallowed by the darkness. As for the rest, she can't remember for the time being. In this life, her mother is a 17-year-old girl named Li Mu.

A year ago, Li Mu suddenly wanted to have a child of his own, so he picked out a healthy sperm source in the sperm bank and used IVF technology to get pregnant. There is no need for a man at all, and there is no need to get married.

It was very hard to conceive a baby in October, so she learned the relevant knowledge in advance and also attended a training course for expectant mothers. But at the moment the child was born, she felt that no matter what hard work was worth it. This is the child she bore for herself, not for someone else. Li Mu loves his daughter very much, and named her Li Xu.

The world of males has disappeared for more than 80 years, and now humans rely mainly on sperm banks for reproduction. Because they are all single mothers supporting their daughters, they are not married.

What the hell is happening on Earth.

The year 2031 is a year before the nuclear explosion. Radiation falls, and sunlight shines back onto the earth. The surviving astronauts in space saw a dirty snowball, covered in snow and ice from the poles to the equator, and the dust stained the white snow and ice gray. The oxygen that used to make up 20% of the atmosphere is depleted, and carbon dioxide concentrations have risen instead.

Under the sunshine and the appropriate greenhouse effect, the equatorial ice sheet began to melt and the glacier retreated to the area around Guangzhou. The temperature at the equator rises from minus 20 degrees Celsius to more than 10 degrees above zero. All the fungi on the ground were killed by the lethal ultraviolet rays, which was a complete elimination of the poison.

Chinese and American astronauts landed in Borneo in Southeast Asia and the Amazon Delta in South America, respectively. Use caves at the equator to build a closed base. Solar panels are used to obtain electricity, and water is electrolyzed to obtain oxygen.

After hundreds of years of development, the surviving human beings have expanded from the original base to a closed city. Humans live in UV-blocking glass covers and use three-dimensional farms to get food. In addition, due to the fear of nuclear explosions, mankind refuses to use nuclear energy. The main source of human energy is provided by natural gas and combustible ice.

Since the ancestors had to come into contact with the outside world, whether they were building a base or mining combustible ice, they would definitely be exposed to radioactive fallout. Human beings are more likely to mutate their genes when they are affected by radiation.

In sexual reproduction, the first division of the meiotic causes genetic recombination of chromosomes. Genetic recombination brings together good genes and can also correct genes that have undergone erroneous mutations. However, the human Y chromosome, unlike the X chromosome, cannot undergo genetic recombination. The XX sex chromosome in females can repair itself, but the XY sex chromosomes in males cannot.

As a result, false mutations that occur on the Y chromosome accumulate and gradually lead to shortening of the Y chromosome. Since the birth of the Y chromosome, the Y chromosome has been shortening. The Y chromosomes of the yellow mole, the mole vole, and the Japanese spiny rat have disappeared. The human Y chromosome will take another 5 million years to disappear.

However, intense nuclear radiation increases the chance of genetic mutations in humans and accelerates the accumulation of faulty genes on the Y chromosome. Advance the Y chromosome disappearance date from 5 million years to one or two hundred years.

In addition, men** are close to the skin and are more susceptible to radiation damage. Originally, this was a cooling measure taken to produce a large number of sperm, but in the high radiation environment, a large number of male ** lesions and loss of fertility were caused.

To save humanity, healthy sperm is frozen and serves as a sperm bank. Women who need to have children can artificially conceive and have offspring by purchasing healthy sperm for IVF technology. Due to the accumulation of a large number of false mutations on the Y chromosome, sperm carrying the Y chromosome cannot develop into a healthy embryo after insemination. Therefore, human beings now can only have daughters, not sons.

"Mom, where did Dad go?" Li Xu asked her mother curiously. The brain is not fully developed, and the memories of past lives are not fully restored. However, Li Xu still remembers that there should be men in the "normal world", but she has never seen a man since she was born, and she has not even seen "Dad".

"Baby, where did you know the word 'daddy'?" Li Mu was curious about her daughter's question and said with a smile: "Mom doesn't have a father, everyone doesn't have a father." ”

Li Mu patiently explained the current earth to his daughter, so that Li Xu could roughly understand the current world, a world where only women remain.

Li Xu remembered that the dark spatial crack devoured himself and another person, and if he crossed it, then the other person should also have crossed. Who is that person? Is it also a girl in this world? Where are you now?

There has always been a voice in my heart telling Li Xu not to forget that person, and to find that person.