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
. Lucy is the common name of AL 288-1, several hundred pieces of bone representing about 40% of the skeleton of a female Australopithecus afarensis. In Ethiopia it is also known as Dinkinesh which means "you are marvelous" in the Amharic language. It was discovered in 1974 at Hadar in the Awash Valley of the Afar Triangle in Ethiopia. In paleoanthropology, usually only fossil fragments are found and only rarely are skulls or ribs uncovered intact; thus this discovery was extraordinary and provided an enormous amount of scientific evidence. Lucy is estimated to have lived 3.2 million years ago, and is classified as a hominin. The skeleton shows evidence of small skull capacity akin to that of apes and of bipedal upright walk akin to that of humans, supporting the debated view that bipedalism preceded increase in brain size in human evolution.