In 1974, on a survey in Hadar in the remote badlands of Ethiopia, U.S. paleoanthropologist Donald Johanson and graduate student Tom Gray found a piece of an elbow joint jutting from the dirt in a ...

Early stone toolmaking marks an important juncture in evolution. The Oldowan stone tools from Hadar, Ethiopia, are among the oldest known, dating back 2.3 million years. Shown from various angles ...

In 1973, when Don Johanson found a surprisingly human-looking fossil knee at Hadar in Ethiopia that tuned out to be more than 3 million years old, it was the one of the most compelling pieces of ...