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Studies have found that the ring of dark color that surrounds your iris — called the limbal ring — could determine whether or not a person finds you immediately attractive. Researchers at the University of California, Irvine discovered that men found women with dark limbal rings more attractive than those with unnoticeable limbal rings.

For the full story, please visit https://www.yourtango.com/love/scientific-clues-explain-so-attractive-some-people-not-others.