Science's breakthrough of the year: Uncovering 'Ardi'

The research that brought to light the fossils of Ardipithecus ramidus, a hominid species that lived 4.4 million years ago in what is now Ethiopia, has topped Science's list of this year's most significant scientific breakthroughs. The monumental find predates "Lucy," -- previously the most ancient partial skeleton of a hominid on record -- by more than one million years, and it inches researchers ever-closer to the last common ancestor shared by humans and chimpanzees.

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