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 ...

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.

But now I'm climbing actual limbs on this 200-year-old tree, one after the next, remembering Robertson's rule: Always keep three points - either one foot and two hands, or two feet and one hand ...

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 ...

For example, she will have to "monkey up the tree as fast as [she] can and ring a bell," rescue a 68-kilogram dummy placed 6 to 7.5 metres above the ground and climb a 50-foot vertical rope.