"She showed us conclusively that upright walking and bipedalism preceded all of the other changes we'd normally consider being human, such as tool-making. She gave us a glimpse of what older ancestors would look like. Lucy is really at a nice point on the family tree: she sits at this pivotal point between things that are more ancient and things that are more modern." -Donald C. Johnson, 2009
November 24, 1974 – Donald Johanson and Tom Gray discover the 40% complete Australopithecus afarensis skeleton, nicknamed "Lucy" (after The Beatles song "Lucy in the Sky with Diamonds"), in the Awash Valley of Ethiopia's Afar Depression.
Australopithecus afarensis is an extinct hominid that lived between 3.9 and 2.9 million years ago. The most famous fossil is the partial skeleton named Lucy (3.2 million years old) found by Donald Johanson and colleagues.