Introduction: Index finger longer than ring finger: women have higher fertility, are more humble, more sensitive, more susceptible to breast cancer, and less risk-taking; Ring finger longer than index finger: women have relatively weaker fertility, overly confident, less prone to breast cancer, and very risk-taking. The latest research findings suggest that fingers can indeed indicate a person's health, fertility, marital prospects, and even the likelihood of diseases such as heart disease and breast cancer. Additionally, human athletic ability, aggressiveness, and autism are also linked to the length of the index finger and ring finger. When our embryo grows to about 5 weeks, hands already appear, but they are very small, resembling fish fins. As development continues, the fingers begin to grow slowly, and the webbing between the fingers gradually...