Reports that archaeologists have uncovered the remains of people nearly ten feet tall in a Nevada cave have pushed a long‑running fringe legend into the center of viral attention. The claims lean on a ...

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. Video above: ...

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