The recorded history began with the invention of characters, and even the invention of characters grew for a period of time, becoming a history that modern people can study and perceive. In fact, prehistoric civilization is not unconscious, let alone blank, because the experience accumulated by our ancestors in evolution has been deeply rooted in the bones of civilization, and our words and deeds are the result of their hard exploration. For example, the way we use fire, the pronunciation of language, the reaction when we encounter fear, especially the avoidance of natural disasters such as fire, lightning and flood, all of which are deposited in our ancestors' genes. In other words, we are living specimens of all the evolution of our ancestors. Also, don't think I'm talking nonsense. In fact, the knowledge deposited in genes is the most important. There is a butterfly that migrates from south to north once a year and rests on a fixed tree every time. This batch has been several generations behind the previous batch, and there is no possibility of inheritance. This is knowledge deposited in genes. The knowledge and experience that we can learn and perceive through our eyes and ears is actually a small part)