Here be humans - by Razib Khan - Razib Khan's Unsupervised Learning
We're not the man we used to be. Over the last twenty years, genomics, ancient DNA and paleoanthropology have joined forces to completely overhaul our understanding of the origin of our species. The true diversity and complexity of human evolution over the last few hundred millennia surpasses even the most unhinged imaginings we might have hazarded just a short generation ago. But greater clarity has left us with a messier and less elegant narrative. Our species’ status, it turns out, is “complicated.”
In the year 2000, the orthodoxy was that humans spread across the world 60,000 years ago, and were descended exclusively from a small population in Africa. Neanderthals and various other human groups (and yes, we didn’t even deign to give them all names) were evolutionary “dead ends.” Of interest mostly to scholars, they were dismissed as failed experiments in a world our ancestors won. Today, this tidy story of us no longer passes a basic fact check.
In 2010, genomes recovered from ancient remains of “archaic hominins” in Eurasia turned out to have genetic matches in many modern humans. It seems they weren’t quite as “archaic” as we thought. In addition, we had to get used to the new reality that a solid 2-3% of the ancestry of all humans outside Africa is Neanderthal. About 5% of the ancestry of Melanesian groups, like the Papuans of New Guinea, actually comes from a previously unimagined new human lineage discovered in Denisova cave, in Siberia of all places.
