"Psychopathic Tendencies Revealed by Surprising Physical Trait, Study Finds"

A study in Canada found that individuals with clinically diagnosed psychiatric issues, particularly those with "Dark Triad" traits such as psychopathy, are more likely to have a shorter index finger and longer ring finger, indicating a lower 2D:4D ratio. This ratio is associated with prenatal exposure to higher testosterone and lower estrogen, but the lead author warns against interpreting finger length as a person's irrevocable fate.