Ardipithecus

The paleoanthropologist Dr. Yohannes Haile-Selassie has been key in that hunt for answers.

He's helped discover some of the most important known hominid fossils, like the bones used to describe the two-point-five-million-year-old Australopithecus garhi and the first pieces of a four-point-four-million-year-old partial skeleton of Ardipithecus ramidus.

You know Ardi.

We all know Ardi.