Researchers at WUSTL and the Institute of Vertebrate Paleontology and Paleoanthropology (IVPP) in Beijing have been studying a 40,000-year-old early modern human skeleton found in China and have determined that the "out of Africa" dispersal of modern humans may not have been as simple as once thought. The research was published in the Proceedings of the U.S. National Academy of Sciences on April 3.