Thu, 10 Mar 2011 18:30:17 +0100 (AFP/File) - A pair of Homo Neanderthalensis skulls are seen on display at the Smithsonian National Museum of Natural History in Washington, DC in 2010. Some defining human traits -- a penis bereft of the stiff sensory hairs common to many male mammals, a bulging brain -- come less from new genes than genetic material lost through evolution, according to a study published Thursday.(AFP/File/Mandel Ngan)
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