For years, spot-the-difference puzzles have intrigued and entertained people of all ages. These brain-teasing challenges ...

Sloths appear to have life figured out, and once the details are revealed, being envious makes sense. These tree-dwelling ...

A sloth’s curved claws are long and perfectly shaped for hanging onto tree branches. Even in sleep or after death, sloths can remain suspended from trees because their grip doesn’t rely on muscle ...