Sometime between 28,000 and 30,000 years ago, an anatomically modern human in what is now France may have eaten a Neanderthal child and made a necklace out of its teeth, according to a new study that suggests Europe's first humans had a violent relationship with their muscular, big-headed hominid ancestors. The evidence, which includes teeth and a carefully butchered jawbone from a site called Les Rois in southwestern France, could represent the world's first known biological proof for direct contact between the two human groups.