New research suggests that humans, new to the Americas, lived alongside giant ground sloths and mastodons for millennia.

When I first went vegan, the choice seemed at odds with my family traditions. Here's how I found a way to feel connected to ...

Their prehistoric ancestors were huge — up to 4 tons (3.6 metric tons) — and when startled, they brandished immense ...

Sloths weren’t always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons — and when ...

Research from several sites is starting to suggest that people came to the Americas earlier than once thought.