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.

But much later, when I joined high school, maybe college ... and was assigned to work at the National Museum of Ethiopia where Lucy was housed in. The office I was assigned to work in was filled ...

Lucy was discovered in 1974 in Ethiopia and when she was found 50 years ago, she was the oldest known human specimen in existence. The remains of the proto-human are 3.18-million-year-old and they ...

NPR's Scott Simon speaks with paleoanthropologist, Donald Johanson, about the 50th anniversary of his biggest discovery, Lucy, an early human ancestor.