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Ardi (right) lived in a forest in Africa. Her fossil skeleton shows that she walked upright and yet had an opposable toe, good for climbing trees. (Tim White 2009, From Science Oct. 2 issue; Illustration by J.H. Matternes)

The Human Family's Earliest Ancestors

Studies of hominid fossils, like 4.4-million-year-old "Ardi," are changing ideas about human origins

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