The oldest distinguishing feature between humans and our ape cousins is our ability to walk on two legs—a trait known as bipedalism. Among mammals, only humans and our ancestors perform this atypical ...
This is the story of Ardi (Ardipithecus ramidus), one of our special ancestors called hominis. The discovery of her 4.4-million-year-old skeleton challenged everything we knew about evolution. Let's ...
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