Here’s what you’ll learn when you read this story:Researchers determined that footprints in White Sands National Park in New Mexico are from the oldest migrants to North America. An endless ocean of white sprawling across New Mexico’s Tularosa Basin, White Sands National Park glitters with dunes of gypsum sand. From those sands have surfaced footprints that would rewrite human history. Archaeologist and geologist Vance Holliday—now a professor emeritus at the University of Arizona—started researching the geologic strata of White Sands in 2012. Ice sheets that blocked the Bering Land Bridge between Asia and North America made human migration impossible.