Artifacts dated to 30,000 years ago tell of human resilience in an unforgiving environment, and they may provide new clues to the peopling of the Americas Primates are simply not primed for Arctic survival. A person lost on the tundra in winter will quickly perish, and even the sturdiest shelter atop the permafrost provides scant refuge without a supply of fuel. Yet somehow, at the height of the last Ice Age, humans endured a similarly unforgiving environment in northern Siberia, in the Yana River valley 500 kilometers above the Arctic Circle. That's the surprising conclusion from a trove of artifacts...