Rachael has a degree in Zoology from the University of Southampton, and specializes in animal behavior, evolution, palaeontology, and the environment. Rachael has a degree in Zoology from the ...

Imagine a sloth. You probably picture a medium-sized, tree-dwelling creature hanging from a branch. Today's sloths—commonly featured on children's backpacks, stationery and lunch boxes—are slow-moving ...

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: ...

Video of the event shows a blast erupting from the bottom half of the 20-story-tall craft as SpaceX was performing structural tests in the predawn darkness. The Super Heavy booster, dubbed Booster 18, ...

Researchers discovered that chronic inflammation fundamentally remodels the bone marrow, allowing mutated stem cell clones to quietly gain dominance with age. Reprogrammed stromal cells and interferon ...

Near Palm Springs, California, Joshua Tree National Park is a protected desert expanse named for its signature yucca plant with twisted limbs and spiky leaves. The best time to visit the park is ...