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Human Evolution

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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.

chimpanzee and human

THE DIFFERENCE  Humans and chimpanzees are easy to tell apart, even though they share a primate ancestor. Jumping genes helped sculpt their distinctions.

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