No investigation of the human story in the Americas [...] can ignore the role of Siberia as a crossroads in the migrations of our ancestors. Moreover, despite the fact that only a tiny fraction of its vast area has yet been sampled by archaeologists, we already know that anatomically modern humans were present in both western and Arctic Siberia at least as far back as 45,000 years ago. We know, too, that DNA studies have revealed close genetic relationships between Native Americans and Siberians that speak to a deep and ancient connection.