Recent work on DNA has revealed that early humans and Neanderthals not only met but had children together, begging the question as to whether they even recognised one another as separate species. Despite being very similar, there were significant differences in their facial and skeletal structures that would have made them look different. Modern humans’ facial development ceases earlier in the process of growing up, leaving us with features that would probably have looked juvenile to Neanderthals, whose facial features tended to be larger. The changes in skeletal structure may also have meant that the Neanderthal people had somewhat different ranges of sound, implying that their languages would have been quite different too. Perhaps some early translators helped the two groups to communicate, and stone-age love to blossom.
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https://sites.dartmouth.edu/dujs/2021/03/07/were-we-smarter-than-neanderthals/