We have one or several layers of special skin on our heads, and the shape of our hair is reminiscent of the whirlpool formed in the current. When we were young, we called it "whirlpool". I remember when I was a child, I met the child with two whirlpools, and other children often came to see it curiously. Although the research on this problem does not show much relationship with human health, such a fun problem has attracted some curious people to seriously study it as a serious problem. This curiosity adds a lot of fun to our life. Then why does the hair grow irregularly, but there must be a piece of dishonesty that gives birth to a spiral? The vortex above the head has a big name called "vortex above the head", so is it only the vortex above the head? In fact, many other parts of the human body can also have similar "whirlpools" produced by hair. What about the rest? Some people have similar curls near their foreheads, and it is very troublesome to take care of their hair. Some people have similar spirals around their necks near their ears or on their backs. We can collectively call these eddies hairy eddies. They are called Hair whorl in English, which means spiral hair. Only humans have spirals? Actually, most furry animals are furry. In ancient times, people paid as much attention to animal curly hair as we did to our own curly hair, because in many domesticated animals, the abnormality of curly hair often indicates the abnormality of animal personality. Ancient Arabs and Gypsies believed that the rotation of hair was closely related to the character of horses. At present, many studies are carried out with domesticated cattle. 1995, Glandien and others published a paper in Applied Animal Behavior Science. After analyzing their own experimental results, they think that when you try to restrain the behavior of cows, cows with hair spirals above their eyes will become more excited than cows without hair spirals here. Like the brain, hair follicles develop from the ectoderm of embryos. Therefore, serious abnormality of hair wheel, such as no hair wheel at all, or serious error of hair wheel position, may indicate some abnormality of nerve development. So as to provide some clues for people to predict the character of domestic animals. It seems to be a philosophical question whether curly hair has anything to do with people's personality, and whether personality is innate or acquired. There is no acceptable answer to this question, but we can say with certainty that some aspects of personality are determined by genes.