Blog Post Image: Society Bloomed with Gentler Personalities, more Feminine Faces

Robert Cieri used facial measurements from more than 1,400 ancient and modern human skulls for a study that suggests reduced human testosterone levels accompanied the advent of modern human behavior and culture. Cieri, now a biology graduate student at the University of Utah, led the study when he was a senior at Duke University. He made some of the skull measurements himself; others were taken from previous studies. Photo Credit: Robert Cieri, University of Utah

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