Knowledge about dominoes?

According to China's Zhengzitong, in the second year of Emperor Xuanzong of Song Dynasty (A.D.1120th), a game called "Domino" appeared among the people, which was introduced to the palace from Song Gaozong and then quickly became popular throughout the country. Dominoes at that time were mostly made of tooth bones, so dominoes were also called "tooth cards", while folks called them "Pai Jiu". 1849 On August 6th, the Italian missionary Domino brought this domino back to Milan and gave it to his daughter, Little Domino. Little Domino gradually likes this game, because she has found a new way to play dominoes, and she connects them according to the size of points. When playing Domino, Little Domino found that it can exercise people's will and endurance well. Ahrend, the boyfriend of Little Domino, is an impetuous person, so Little Domino asked him to put 28 cards one by one. If Ahrend can't finish folding 28 cards in the limited time, or the folded cards drop, Little Domino will restrict him from attending the dance for one week. After 7749 days' training, Ahrend's character became resolute and strong, and also became calm and calm. In order to let more people play elegant domino games, missionaries made a large number of wooden dominoes. Soon, wooden dominoes spread rapidly in Italy and the whole of Europe, and the domino game became an elegant sport for Europeans. Later, in order to thank Domino for bringing them such good sports, people named this domino game "Domino". By the19th century, dominoes had become a worldwide sport. Among the non-Olympic sports, it is the most famous sports with the largest number of participants and the widest scope of expansion. Since then, "Domino" has become an international term. No matter in the political, military or commercial fields, as long as there is a chain reaction, people call it "domino effect" or "domino phenomenon"