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These particular organisms looks to be shared between Neanderthals and humans about 120,000 year ago, or about the time that humans and Neandertals were interbreeding, these interbreeding encounters were often described as brash, rough one-night stands, but if they were swapping oral microorganisms, it means they were also swapping spit. So, potentially kissing or food sharing would have been involved, which suggests that these encounters may have been much more friendly than anyone imagined.