A 3-million-year-old cold case solved

When Lucy, the world's most well-known fossil, was discovered sticking out of a shallow Ethiopian stream bed in 1974, she provided new insight about life for early human ancestors 3.18 million years ago. The image of her skeleton -- which is estimated to be 40% complete and considered the best representation of her species, Australopithecus afarensis -- became iconic.

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