Babies' unfused skulls linked to bipedalism

A new analysis of a fossil discovered in 1924 indicates that human brain evolution may be connected to walking upright.

New human species discovered

You wait ages for a new human species, and then two come along at once. Hard on the heels of the discovery of a new type of hominin in Siberia, an international team says it's found the closest yet type of australopithecine to modern humans.