This undated photo provided by Ludovic Slimak shows scientists working at the entrance of the Mandrin cave, near Montelimar, southern France. Scientists have uncovered fossilized modern human remains and tools sandwiched between Neanderthal remains and tools in the stratigraphic record at a site in the Rhône Valley in France, suggesting occupation of the area alternated between Neanderthals and modern humans. (Ludovic Slimak via AP)