These are skull casts from human evolution. Left to right: Australopithecus afarensis, Homo habilis, Homo ergaster, Homo erectus and Homo neanderthalensis. Disclaimer: AAAS and EurekAlert!

The skull, which they found in South Africa, is of the species Paranthropus robustus, a cousin species to our predecessors, ...

In a fascinating discovery that will force scientists to rewrite our species' evolutionary history, an international team has unearthed the earliest known skull of Homo erectus-- the first of our ...