Many people like to judge a book by its cover. What is the scientific basis for judging people by their appearances?

First, about the question itself, your question itself is a bit flawed. I read some related books. Judging a person's character by his face is a means. It is a part of physiognomy, but there is no scientific basis for physiognomy at present. Therefore, the word science can be temporarily removed from the second half of the question. We can't say that many things are pseudoscience without judging that they have scientific basis. Because the universe is too big, human beings know too little. Many people think that physiognomy (including physiognomy) belongs to mysticism. Second, the common sense about the five senses is a knowledge of judging life by looking at the five senses. This sentence mainly means that a person's personality, disposition and being good or bad can be seen from his face. The basic meaning refers to the appearance, generally refers to the image of things. Zhang Jinhuayun, a descendant of Shi Tian, has a big face: facial morphology, including eyebrows, eyes, mouth, nose, ears, forehead, cheekbones, chin and other parts and organs. Xiang Xuehai believes that "a hundred schools of spirits live in a spiritual place, leading to the spiritual path of the five internal organs, but only three talents can be imaged, which will determine the gains and losses of a lifetime." Therefore, the face is regarded as the most important part of breaking people's good or bad luck. Most of the things mentioned in the following links are personal beliefs. Quote from: Faces _ Baidu Encyclopedia In ancient times, people didn't have so many means to know their bodies, let alone others. Later, physiognomy became an important means for people to understand their own health and care for others, and accumulated a lot of experience in the long-term development of mankind. Physiognomy integrates medicine, statistics and numerology. Faces are part of physiognomy, and physiognomy is part of physiognomy. Namely: phase/phase/phase. The subject can look at it this way: Does the face really exist? Thirdly, the theoretical basis of face is based on induction, that is, observing the fate of a large number of people, finding the probability relationship between fate and a certain feature, and then establishing a theory. Take the lifeline of the hand as an example. Ancient fortune tellers read the palm of the deceased and found that the life span was most closely related to the lifeline. The longer the lifeline, the longer the life span, so that line is called lifeline. Whether physiognomy belongs to pseudoscience remains to be studied, but its accuracy is really high. =。 I hope it will be helpful to the subject.