Human Ancestors Walked on Knuckles

The famed fossil Lucy harbors a most unladylike secret: In life, her wrists locked into place instead of bending backward, a sign that her ancestors -- and ours -- walked on their knuckles like modern chimpanzees and gorillas before striding only on their feet, report two paleoanthropologists at George Washington University.

The study "addresses one of the most fundamental questions that still remains in paleoanthropology today, and that is, 'Why did humans

Digital or Print Subscription

Already have an account? Log In Now.