Walking and running upright on two feet as humans do requires some specialized adaptations of the skeleton and muscles. Modern human anatomy has built on the strengths and the weaknesses of a body ...

But Lucy and other fossil finds reveal that more than 3 million years ago, a relatively small-brained, ape-faced human ancestor walked steadily on two feet ... well as to the anatomy of "knuckle ...

A biomechanics study conducted by University of Rhode Island graduate and former star guard on the women's basketball team ...