Modern humans and Neanderthals may have shared more than land and genes. Modern humans and Neanderthals may have shared more than territory, tools, and genes. The discovery comes from Üçağızlı II Cave, a site near one of the most important migration routes in human history. Their work revealed that Neanderthals and modern humans used the site across a period of more than 20,000 years. Credit: KyotoU / Naoki MorimotoThe findings add to a growing picture of Neanderthals and modern humans as populations whose lives repeatedly overlapped.