When did humanity take its first step? Scientists say they now know. The Washington PostFresh bone analysis makes case for earliest ‘ancestor of humankind', but doubts remain The GuardianWas our earliest ancestor a knuckle-dragger, or did it walk upright? New ScientistEvidence of upright walking found in 7-million-year-old Sahelanthropus fossils Phys.orgEarliest Human Ancestor May Have Walked on Two Legs
