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New research from several sites is starting to suggest that people came to the Americas earlier — perhaps far earlier — than once thought.

The bold question-askers at What If explore how 7-ton sloths might have reshaped ecosystems and human history.

Will Smith took fresh aim at Chris Rock in a fiery freestyle on "Fire in the Booth," referencing the Oscars slap.

Sloth. Image via Openverse. Three-toed sloths (genus Bradypus) engage in perhaps the most baffling bathroom behavior in the animal kingdom. Approximately once a week, these creatures laboriously ...

Sloths, the world's slowest mammal, have been around for 64 million years. Sharyn Alfonsi traveled to Costa Rica to learn more about how they've survived.

The contrast is stark and poignant. While a sloth might travel only 41 yards per day, habitat destruction can clear thousands of acres of forest in the same timeframe. As human activity accelerates, ...

Ancient sloths lived in trees, on mountains, in deserts, boreal forests, and open savannahs. These differences in habitat are primarily what drove the wide difference in size between sloth species.