More than 150 years ago, Darwin proposed the theory of universal common ancestry, linking all forms of life by a shared genetic heritage from single-celled microorganisms to humans. Until now, the ...

New research raises questions about the theory that modern humans and Neanderthals at some point interbred, known as hybridization. The findings suggest that common ancestry, not hybridization, better ...

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For years, medicine has relied on self-reported race/ethnicity as the basis of an array of decisions, from risk for disease to matching organ donors. Now, a study led by researchers at UC San ...