"Part I: Homo sapiens Conquers the World" and "Part II: Homo sapiens Gives the World Meaning" basically belong to the review of human history. Homo sapiens here refers to all human beings on the earth at present, and is a "species" of the genus Homo in biological classification. Humans have gone through a long process from apes to humans.
From the extinction and conquest of other animals to the rule of the world, compared with other animals, human beings are as advanced as gods. But Harari believes that the truth is that people are no different from other animals.
Humanist feelings and "humanity" pursued by human beings are all a set of biological algorithms. Emotion and desire algorithm helps people to make decisions quickly, but the principle and content of this algorithm have not been discovered and perceived by human beings so far because of the limited technical strength at present.
However, human beings will never give up exploration, just as human beings have been pursuing the technology of "eternal life" since ancient times. From the elixir of Qin Shihuang to the stone of the sage in alchemy, once the chance happens, the technology explodes, the singularity comes, and the mystery of biological algorithm is discovered by a gifted computer scientist or biological scientist, human beings have completed their ultimate goal of becoming "like a god".
In fact, in Part III: Mankind Out of Control, Harari also expounded his vision of class polarization in the future-most human beings will be worthless, most individuals will lose their authority, and all kinds of daily work will be handed over to algorithms and AI.