When did humanity take its first step? Scientists say they now know. - The Washington Post

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