Animals’ nature is in the animalsselves, however, human nature is not in the humanselves. The most important human nature is presented in the fact that human being is the toolusing and toolmaking animal; therefore, tools can be compared to external bones and external genes of human beings. We must pay attention to not only the study of archeology of knowledge, but also of archeology of tools. Three stages of the sociological development have indivisible connections and interactions with three stages of the tool development, the stage of manual tools, of machines, and of social infrastructures.ofmanu
