A forensic technique more often used at modern crime scenes identified blood residue from large extinct animals on spearpoints and stone tools used by people who lived in the Carolinas millennia ago.

From the high Yukon to the mountains of Central Asia, melting ice exposes fragile ancient artifacts that tell the story of the past – and provide hints about how to respond to a changing climate.

Did people settle these islands by traveling north from South America, or in the other direction? Reanalyzing data from artifacts discovered decades ago provides a definitive answer.