Today, I will talk about yin and yang. Yin and Yang are two concepts that refer to the original two opposing entities that make up the entire universe. Regarding the origin of yin and yang, no one knows where it comes from. The interdisciplinary scientific studies of Vietnam and China have concluded that "the concept of yin and yang originates from the South" ("Southern" here includes southern China, from the Yangtze river and Vietnam).
The law of yin and yang:
+ Nothing is completely negative or completely positive,
+ In yin, there is yang. In yang, there is yin.