Ann Gibbons on "The First Human"

Australopithecus africanus at the University of Zurich.

Australopithecus africanus at the University of Zurich. Guérin Nicolas (CC BY-SA 3.0)

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Ann Gibbons is an award-winning science writer and author of “The First Human: The Race to Discover Our Earliest Ancestors.”  She tells Jim Fleming about the teams of paleontologists she met in Africa who are studying four to six million year old fossils of human ancestors.