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In 1994, a college student called Yohannes Haile-Selassie unearthed a 4.4 million-year-old skeleton in Ethiopia.

She was the first near-complete skeleton of a species of human ancestor called Ardipithecus ramidus. The paleoanthropologists who discovered her called her Ardi. The discovery upended how scientists view human evolution.

(Picture: Yohannes in Afar, Ethiopia. Credit: Yohannes Haile-Selassie)