Our first steps? Fossil may boost case for earliest ancestor

Twenty years ago, scientists discovered a 7-million-year-old skull that they concluded belonged to a creature who walked upright and was our earliest known ancestor. Not everyone was convinced. Now, the researchers are back ...

Like humans, apes communicate to start and end social interactions

When we're talking to another person, we probably wouldn't leave without saying goodbye; that would just be impolite. Apes seem to do something similar, researchers report in a study publishing August 11 in the journal iScience, ...

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