The ancients combined the five skills of "life, divination, physiognomy, medicine and mountain" and called them "China Five Techniques". Science is originally a system of accumulated experience, and China's Five Musts are also divided into five categories according to the different experiences of countless ancient sages and philosophers who spent their lives. They are "numerology" based on the theory of understanding the fate of human life, "divination" based on the method of predicting the outcome of events, "physiognomy" based on reading palms, houses and tombs, and exploring "medicine" in the field of life spirit based on human observation and medical discovery.