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We know that early humans and Neanderthals interbred. But we don't really know about that interaction. Did they live together or run into each other and have a one night stand ? early humans brought with them a new technology for making stone tools -- more nuanced, with material from new places. We have sites with the old tools that we associate with Neanderthals and new tools we know( early modern) humans made but we don't have bones associated with those tools. It's entirely possible we met them and taught them how to do this.