This book focuses on the unsolved mysteries and unpopular knowledge of ancient and modern history, covering interesting historical facts in many fields. From the millennium existence of the Lone Bamboo Kingdom, the controversy over Xiang Yu's title and death, to the origin of the ancient Hongmen secret code of the OK hand gesture; there are not only UFO sighting records in ancient books, the etiquette debate on the Confucian view of revenge, but also the evolution of proverbs, ancient military wisdom, etc. By analyzing the truth behind historical events, idioms and allusions, and folk beliefs, it unearths overlooked historical details. It is based on historical materials and interesting, leading readers to jump out of traditional cognition, explore historical secrets beyond official history, and feel the weight and wonder of human civilization.
