Sloths weren't always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge - up to 4 tons - and when startled, they brandished immense claws. For a long time, scientists believed ...

SAO PAULO — Sloths weren’t always slow-moving, furry tree dwellers. Their prehistoric ancestors were huge — up to 4 tons — and when startled, they brandished immense claws. For a long time, scientists ...

Robert Zubrin, likely the planet’s leading strategist for landing humans on Mars, and then remaking it in the Earth’s image, predicts SpaceX’s colossal Starship will be the first spacecraft ever to ...

US President Donald Trump last week laid out one of the biggest challenges ever for NASA — to land the first humans on Mars. But his detailed budget request for the fiscal year 2026 also proposed ...

Sloths weren’t always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons — and when startled, they brandished immense claws. For a long time, scientists believed ...

SAO PAULO (AP) — 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. For ...

The very first humans to make and use stone tools may have sourced their raw materials from distant locations, demonstrating a surprisingly sophisticated resource-management strategy. Previously, it ...