Ancient seas left an expanse of rolling gypsum dunes known as White Sands in New Mexico, and within this surreal landscape lies evidence that humans have roamed the Americas for at least 20,000 years.

Radiocarbon dating of ancient human footprints at White Sands National Park in New Mexico confirmed that humans were present in North America approximately 10,000 years earlier than previously ...

SÃO PAULO, Brazil — Sloths weren’t always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons (3.6 metric tons) — and when startled, they brandished immense claws.

Using new radiocarbon dating on ancient footprints found preserved in the gypsum-rich ground in White Sands, researchers have now confirmed that humans roamed North America 23,000 years ago. The ...

Humans were present in North America 10,000 years earlier than previously thought, according to a new study. Researchers from the University of Arizona have analysed fossilised footprints found at ...

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"Making North America: Human" – From Ice Age to oil boom, discover the challenges faced and the wealth uncovered as humans take over the continent. (Also Thu. 11/19 at 3 a.m.; Sun. 11/22 at 1 p.m.) ...

Humans were present in North America 10,000 years earlier than previously thought, according to a new study. Researchers from the University of Arizona have analyzed fossilized footprints found at ...