For example, reading "A Brief History of Mankind" shows that we humans, a huge biological group, have been competing with many creatures for survival resources since we landed on land, and have won some victories by chance or necessity in this process, standing at the top of the food chain, and human beings have also evolved many close relatives in the process of development. In the process of reading these, we should not only understand where we came from and how we got here, but also treat every animal or plant in our world equally from a biological point of view, because it may be just a small life, and it has also made indelible contributions to the earth environment and shaping our human living environment.