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The history of human civilization is far more complicated than we imagine. The number 6000 years is not the absolute ultimate answer, but a comprehensive judgment based on current archaeological and anthropological research. The earliest human records, such as rock paintings and bone tools, are scattered around the world, and their dating methods are complex and often controversial. These evidences are constantly advancing our understanding of human origins and evolution, and also remind us that the writing of history still requires continued exploration and verification. We cannot draw conclusions based on a single data, but should remain open to the challenge of more new discoveries.

The emergence of language is no accident. It is not only a communication tool, but also the key for humans to understand the world, construct culture, and inherit history. The complex structure of language and its high flexibility reflect the remarkable capabilities of the human brain and enable human society to flourish. An in-depth exploration of the origins of language can help us more fully understand our relationship with the world. The evolution of language is closely related to the evolution of human beings, and together they compose the epic of civilization.

The formation of the earth was not accidental. It went through a long and complex process, from the collapse of the nebula to the formation of the planetary disk, to the cooling of the magma ocean, and finally gave birth to life. By studying meteorites, radioactive isotopes, etc., scientists have gradually uncovered the secrets of the formation of the Earth. Understanding the origin of the earth helps us understand the evolution of the universe and think about humankind's place in the universe. This is not only a scientific exploration, but also a profound reflection on the meaning of one's own existence.

The success of black athletes in long-distance running is not due to a single factor. Genetic factors, such as longer leg proportions and different muscle fiber composition, do play a role. However, training methods, eating habits, social and cultural background, etc. are also key to performance. Simply attributing it to "naturalness" is not comprehensive. Only by delving deeper can we truly understand the complex mechanism behind its outstanding performance.

The term "yellow race" comes from European perspectives and is not a scientific classification. Anthropological research points out that skin color differences are not determined by a single gene, but are the result of the interaction of multiple genes. People in different regions develop different representations under long-term environmental adaptation. Overemphasis on the classification of "yellow people" ignores the diversity and commonality of human beings. We should understand the evolution and distribution of humans from a more objective and scientific perspective.