(CNN) — Ancient, fossilized teeth, uncovered during a decades-long archaeology project in northeastern Ethiopia, indicate that two different kinds of hominins, or human ancestors, lived in the same ...

Left molars from the Ledi-Geraru specimen (left) and a specimen from Hadar, another fossil site in Ethiopia (right). “LD 760 molars compared to A. afarensis.” by  Villmoare et al. from Nature ...

Paleoanthropologists identified the early human based on molars that are several million years old.

A timeless question has always fascinated scientists who study the past. Which comes first, the new behavior or the physical tool that perfects it? Do you change how you live and then evolve the body ...

The emergence of Homo species, with their larger ... and canine teeth had not been previously seen in afarensis or garhi teeth, Villmoare said. The teeth were also different in shape than those of any ...