The Tibetan Plateau is one of the great unexplored mysteries
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Without giving away too many spoilers, paleoarchaeologists trek to the Pamir mountains in search of ancient hominids.
I've looked at the location of the Pamir range in relation to the Tibetan plateau. Also, I found this article on the genetic makeup of modern Tibetans: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5011065/ .
If you're a PhD pushing content on Twitter why would you expect to be taken seriously?