The human hand is a beautiful product of evolution. Each one a finely crafted arrangement of 27 bones, our hands are among the most dexterous in the animal kingdom, and are every bit as capable of threading a needle as they are grasping the oar of a canoe. But newly published findings suggest our palms and fingers may…

A woman was born with what's known as a phocomelic hand, meaning she was missing a finger and thumb on one of her hands. But when that hand was amputated after a car accident, she developed a five-fingered phantom hand.

Evidence of Mars' watery past continues to pile up, but details surrounding the extent and duration of the planet's hydrous history remain muddled — just how wet was Mars, really?