Denisovians Survived on Tibetan Plateau for 160k Years

Reading stories about ancient hominins always piques my imagination. The incredible spans of time, the various species and subspecies (of which at least some were apparently interbreeding), and the lack of historical record always leave me wondering what endless stories have been lost to the annals of time.

&gt; The recently discovered bones include one Denisovan rib that dated to between 48,000 and 32,000 years ago. This is the same time that Homo sapiens were spreading across Eurasia. We already have evidence that these ancient humans lived in this area 190,000 years ago. The new fossil suggests they endured two cold periods and a warmer interglacial period between the Middle and Late Pleistocene eras.<p>So without mentioning what the evidence is about 190K years ago, from two points we infer that they were there the whole intervening time? If conditions were harsh, and if we know they eventually got at least as far as SE Asia, why would we not think that in the huge span between those points, they might have wandered away and later returned? 160k years is a long long time. Apparently humans came across the land bridge into the Americas like 16k years ago.