In the dead of night, Chen Siping silently looked at the transcribed notes, and suddenly felt that he was the only one left in the whole world, and the whole world was cold, only his chest was hot. Some people like to call friends, push cups and change lamps, some people like to be accompanied by their wives and daughters, and have fun watching TV pictures, Chen Siping only likes to be alone, reading and thinking quietly. Sometimes he thinks that this is what his father inherited to him, and the innate genes and the acquired environment jointly shape this trait, but it is a pity that it takes time for the seeds to germinate and grow, and his father did not wait for this day to come. If the father encounters his present self instead of his past self, will he have a different view of his son? Will he run away from home, leaving him and his mother to depend on each other and hate each other? There are no ifs in the world, time can't be turned back, Chen Siping sighed, feeling a little lost.

He heard his mother screaming through the wall, and his heart jumped, and he got up to visit, and his little toes slammed on the legs of the chair, grinning in pain.

Since his mother had Alzheimer's disease, Chen Siping has removed the safety of the door lock, for fear that his mother will lock him in the room and not be able to get out. He limped into his mother's room despite the pain in his toes, only to see her curled up in the sofa, her back bent like a bow, and the fluorescence of the TV illuminated her face, old, confused, and helpless.

Chen Siping squatted beside her and asked a few words, but her mother ignored her, didn't squint, just stared at the TV, as if the scream just now was just his auditory hallucination, and nothing happened to her. Chen Siping stared at his mother for a long time, squatting so that his legs and feet were numb, and then he slowly stood up on the sofa and moved out step by step.

In all fairness, noisy and noisy, before his father ran away from home, his mother was very kind to him. I remember one time, he got into trouble at school, the matter was not big or small, he had a conflict with someone while playing basketball, he was in a hurry, hot-headed, and ran to the side to lift the gutter cover to smash people. The cement cover was too heavy, and I gave up after moving a few steps, but unfortunately it happened to be seen by the principal, so that the student department dealt with it seriously, gave a punishment, and called the parents to sign.

This is not the first time, my father was completely disappointed in him, and said "The state has national laws and family rules", and it will be dealt with according to the regulations of the school, and the punishment will be punished, and the expulsion will be expelled, and he will not sign this letter. The mother broke her mouth, blamed Chen Siping, and went to school the next day to apologize for the smile and sign to admit her mistake, but afterwards she felt wronged and quarreled with her father fiercely. Many days later, when the turmoil subsided, her father asked her, since she didn't want to, why did she wipe his buttocks? Mother blurted out that the meat that fell from her body, how could she give it up!

How can you give up the meat that fell off your body! Thinking of this, Chen Siping's nose was a little sour. He suddenly remembered that his father called this "motherhood."

He hurried to the page and read it from cover to cover.

"Motherhood is human nature, fatherhood is not. To elaborate this viewpoint, we must first set up a major premise: nature is the 'historical heritage' of human natural evolution, which does not change according to the likes and dislikes of individuals or groups, the nature conducive to reproduction is preserved, and the nature that is not conducive to reproduction is eliminated, and the time for us to get out of the 'natural environment' is too short to change the 'nature'.

"When it comes to the human race specifically, the 'investment' in fertilized eggs between men and women varies widely, ranging from about one in one trillion for men to one in three hundred to five hundred for women. The fertilized egg is conceived in the woman's body, and due to the uncertainty of conception, the offspring born to a woman can be sure that she inherits 50% of her genes (more than 50% if mitochondrial inheritance is taken into account), while the male cannot be confirmed. From a reproductive point of view, the female-friendly strategy is to pour resources into a limited number of offspring (who will certainly inherit 50% of the female's genes), and the male-friendly strategy is to have offspring with as many females as possible (who may inherit 50% of the male's genes). In short, women's strategy is 'quality' and men's strategy is 'quantity', and the game between women and men on this issue has profoundly influenced human evolution.

"Babies always come unexpectedly, new mothers think they are ready for everything, but the reality is often the opposite, and it's hard to imagine how women can get through this difficult time in a natural environment without medical care. Instinct drives mothers to make sacrifices for their babies, to sacrifice their jobs, to their sleep, to their own lives, and even to sacrifice their other half, pouring all their love into this little life that carries half of their genes – in fact, seeing it as a 'sacrifice' is also a product of the awakening of women's self-consciousness. Either way, the power of instinct is so strong that most mothers are willing to do it, and few mothers understand why they do it.

"We call this instinct 'motherhood'.

"Neuroscience and molecular biology try to explain 'motherhood.'" Studies in mice have shown that oxytocin receptors act very quickly when they are present at the same time as other reproductive hormones such as estrogen, and can quickly open the dopamine channels of the reward system in the brain. Dopamine is the most well-known neurotransmitter in the brain's pleasure center – and cocaine gives you the pleasure it gets. Essentially, newborn mice are like drugs that trigger pleasure, and the baby effect is an effective catalyst for maternal behavior. In fact, babies have a lot more energy than regular drugs; Soon after giving birth, the mother of the mouse became more affectionate towards the baby mouse than cocaine, and even the food was no longer in their eyes. In order to be able to be with their babies, mothers are even willing to take the huge risk of passing through an electrified fence. Of course, the author also points out that 'we do not know whether the same will happen to humans; But there is growing evidence that this is very likely. ’

"There is no 'supreme love', there is no 'unrequited giving', the mother gets something back from 'love', and it is this feedback that creates motherhood, and the phenomenon of abuse and neglect of her own baby is occasionally reported, can we attribute it to some kind of physiological deficiency, such as the stress response of the oxytocin receptor is not fast enough, not strong enough, not lasting enough? Human emotions can be explained by a complex set of hormone and receptor interactions, and if such an explanation is accurate, then moral condemnation pales in many ways, and even somewhat redundant, and we shouldn't use morality to condemn physiological absence, should we? ”

Chen Siping was punched hard, "We should not use morality to condemn the lack of physiology", this sentence pierced his mind like a blade, leaving him breathless. Is the father hinting at something? He had read so many books and thought so much, but he could not find relief and relief, so he could only flee in the wilderness, seeking a little respite in an irresponsible, undignified, cowardly and embarrassed way. His heart is not strong, and it is not worth forgiving.