When did humanity take its first step? Scientists say they now know. - The Washington Post
- When did humanity take its first step? Scientists say they now know. The Washington Post
- Fresh bone analysis makes case for earliest ‘ancestor of humankind’, but doubts remain The Guardian
- Was our earliest ancestor a knuckle-dragger, or did it walk upright? New Scientist
- Evidence of upright walking found in 7-million-year-old Sahelanthropus fossils Phys.org
- Earliest Human Ancestor May Have Walked on Two Legs Scientific American