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I recently finished the David Reich book I was alerted to here at PS
Who We Are and How We Got Here: Ancient DNA and the New Science of the Human Past.
Absolutely fascinating! Human history is much more complicated than I ever imagined, with ebbs and flows and the intermixing then separating of dozens of different human populations all over the globe. It does not surprise me our Neanderthal cousins also went through such mixing stages.
Reason #283,573 why I 
science.
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