More than 10,000 years ago, a woman or young man—a toddler balanced on one hip—set out on a harried trip northward through what is now White Sands National Park, New Mexico. Rain may have pelted the ...
Fossilized footprints, preserved in gypsum mud that hardened over time, are estimated to be 23,000-21,000 years old. NPS / Alamy Ancient human footprints, preserved in a dry lakebed at White Sands ...