Reuters


But it's not finger length that causes aggression, study author Allison A. Bailey warned in an interview.
She explained that the important factor is the male hormone testosterone. Fetuses are exposed to various levels of this hormone in the womb, and research shows that men who were exposed to higher levels tend to have shorter second fingers, relative to their fourth fingers. "More testosterone, relatively longer ring finger," co-author Dr. Peter L. Hurd told Reuters Health.


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