John K. Lapiana, left, credit Noah Willman. Heran Sereke-Brhan, right. Linda St. Thomas ...

This is a photo of Lucy. Or rather, it’s Lucy, as she was imagined by a sculptor working for a museum. Probably the National ...

Fifty years ago, the discovery of a human ancestor "Lucy" generated worldwide attention. NPR's Scott Detrow speaks with paleoanthropologist Zeray Alemseged about the legacy of the discovery.