A Dou's Gossip in Plain Language: What is culture? What is civilization? From a scientific, physical, chemical, and biological perspective, it is possible to eat human flesh; there are historical legends of people eating their own children. Human flesh could originally be used as food to supplement energy, without the need for economic exploitation; it could be eaten directly, just like raising pigs, chickens, cattle, and sheep—raising them for their meat. But humans are different. They developed emotions and kinship, emphasizing family genealogy and kinship, thus transcending apes and other animals, cooperating to overcome nature, and thus evolving into humankind. What's the saying in the picture?