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Long written off as bear tracks, prints at a site in Tanzania suggest early humans walked on two feet in surprisingly diverse ways. But questions abound.

Examination of stone tools excavated at the Cooper Ferry’s site in Idaho has revealed the presence of humans in North America 16,000 years ago.

Artifacts from the Cooper’s Ferry site poke more holes in the traditional theory of when people arrived in the Americas

The ice age hyenas may have hunted caribou and horses, or scavenged carcasses of mammoths on a cold treeless tundra, says a study.