AP Photo / Michael Stravato LOS ANGELES — The famous human ancestor known as Lucy walked the Earth, but it was her tree climbing that might have led to her demise, a new study suggests.

A 2007 photo shows a three-dimensional model of the early human ancestor, Australopithecus afarensis, known as Lucy, on display at the Houston Museum of Natural Science. The discovery of the new ...

WASHINGTON — Our hands can reveal a lot about how a person has lived – and that's true for early human ancestors, too. Different activities such as climbing, grasping or hammering place stress ...