The oldest potential pre-human, a 6- to 7-million-year old named Sahelanthropus ... The Bulgarian premolar dates back some 7.24 million years ago, and the Greek jaw fossil dates back 7.175 ...

an archaeologically rich site nearby in Tanzania—were shaped by our human ancestors into an impressive variety of wedges and hammers between 2.6 million and 1.6 million years ago, at the very ...