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

This year marks half a century since the discovery of Lucy, a hominid fossil that would go on to drastically alter our understanding of human evolution. The man who unearthed her, Donald Johanson ...

This year marks half a century since the discovery of Lucy, a hominid fossil that would go on to drastically alter our understanding of human evolution. The man who unearthed her, Donald Johanson ...

Fifty years ago, Donald Johanson found "Lucy," a 3.2 million-year-old fossil. She changed the story of human evolution.

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

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