"Indisputable stone tools apparently made by early humans" in northern China about 1.66 million years ago, according to research reported in the journal Nature this week. The finding suggests humans--characterized by their making and use of stone tools--inhabited upper Asia almost 340,000 years before previous estimates placed them there, surviving in a pretty hostile environment.
According to the hypothesis Out of Africa as Pygmies and back as global "Mongoloids" it's precisely the hostile Northern environment (plus relatively rapid climate changes) that helped create advanced erectus as well as modern humans in Asia!
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