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Humans & Society

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runners

Can behaviors really be contagious? Runners log more miles when their friends do — especially if they want to stay leader of the pack, a new study finds.

obsidian tool

WELL TRAVELED  A new chemical analysis finds that this 41,000- to 32,000-year-old obsidian tool, previously unearthed in a Syrian rock-shelter, was transported more than 700 kilometers. That means that long-distance movement of obsidian into the Middle East occurred much earlier than previously thought, researchers say.

Graecopithecus jaw

GREEK PUZZLER  This jaw and teeth previously found in Greece, along with a tooth unearthed in Bulgaria, come from a line of more than 7-million-year-old primates that might have been the oldest known hominids, a new study concludes. Other researchers are skeptical of that claim.

Humans & Society

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