Why am I and you are you? This is a philosophical question, but it is also a scientific question.
From a scientific point of view, all our thoughts originate from the activity of the brain, and all our feelings also come from the brain's feedback on the information received by the body, but whether thinking is equivalent to consciousness is still a controversial question, and the core of the controversy is that if consciousness originates from the brain, then why have there been countless brains for millions of years, but my consciousness can only be born in this particular brain? Why is everyone different? Yeah, there are no two people in this world who are exactly the same, never have been, have not been in the past, and will not be in the future. Of course, the sameness mentioned here includes appearance, but not only appearance.
Identical twins are the most alike people in the world, but there are differences between them.
Although to outsiders, the two twins may look exactly the same, but those who are familiar with them can tell at once, the reason is that there is a small gap in their seemingly identical appearance. This is only from the appearance point of view, if from the whole body inside and outside, then the difference can be big, their internal organs are not the same, the tissue structure of the internal organs is not the same, and the cells that aggregate into the body tissue are also different, of course, the biggest difference is that they have different ways of thinking, have completely different consciousness, I am me, and you are you. So why don't two people in the world who are exactly the same? This is to be dissected from a deeper level.
What is human being made of? Of course, one cell at a time, countless liver cells form liver tissue in a specific way, and liver tissue further forms the liver.
This is just one example, all the organs and body tissues inside and outside the human body are formed in this way. In this way, the cell seems to be the basic unit of the human body, but it is not. If the basic structure of the body is only a cell, then they cannot form a whole, to form such a highly complex life body as a person, each cell must be clear about what it should do, and it is the genome that guides the cell to complete its mission. A genome is an organism that is made up of genes and a variety of substances, which in turn are made up of DNA. DNA is more familiar to us, it is the kind of double helix structure that we can often see.
DNA is the true core of the human body, and if cells are likened to hardware, then DNA is the equivalent of software.
The genome formed by DNA is telling the cell what its mission is, what it should do when, and as long as all the cells faithfully carry out the instructions of the DNA, then all the tissue organs can be formed naturally, and an intelligent life is born. The genome made up of DNA is a very complex system, in which billions of genes are involved, and the sequence of genes that we usually hear is to try to figure out the order of this gene. Why figure out the sequence of the genome? Because different sequences have different inner meanings, and they determine the difference between people.
Genes are the true core of a person, and it can even be said that genes are the real "me".
We always think that we are the dominant body, and genes are just some codes within the body, but is this really the case? In fact, we just keep executing genetic commands. When you're hungry, have you ever wondered why you're hungry? Haven't eaten for too long? This is not the essential reason, sometimes we don't eat all day and don't feel hungry, the reason why we feel hungry is because at this time genes tell us it's time to replenish energy. Similarly, when we are attracted to the opposite sex, have you ever wondered why you would be interested in her? In fact, it is still a gene, and the gene needs to be passed on, and we are just the tools for it to achieve transmission.
Genes determine not only how we look and how physically fit we are, but also how we think and feel.
If the human body is regarded as a system, then our so-called "consciousness" is actually just the executor of this system, and genes are the decision-makers, genes make us feel good about a person or a thing, as for where this good feeling comes from, we don't think about it at all, we only know that good feelings are generated, and now I have to find a way to get this person or this thing, obviously, we are a worker for genes. Since genes are dominant, and no two people in the world can have exactly the same genome, it is natural that there can be no two people in the world who are exactly the same. If outside the human body, the universe is the ultimate mystery of this world, then within the human body, genes are the ultimate mystery of this world, but now human understanding of genes is like the understanding of the universe, it is still only a fur.