People had to travel a long way to inhabit what we now call The Americas.
That raises two questions: how did they travel, and when did they get here? Signs of long-ago human habitation have been found in both Oregon and New Mexico, and New Mexico currently holds an edge: footprints that may date back to the last ice age.
The find is covered in a "Nova" episode on PBS this week, and on our Underground History segment soon after.
Chelsea Rose of the Southern Oregon University Laboratory of Anthropology (SOULA) returns with a pair of companions, Joe Watkins and Carol Ellick of Archaeological and Cultural Education Consultants.
We hear details on the footprints, and the process of confirming their importance.