Researchers recently rediscovered an ancient bear bone recovered from a cave in Ireland in 1903. The 12,500-year-old bone features marks made by a stone tool, evidence that humans were present 2,500 years earlier than previously thought.

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Researchers recently rediscovered an ancient bear bone recovered from a cave in Ireland in 1903. The 12,500-year-old bone features marks made by a stone tool, evidence that humans were present 2,500 years earlier than previously thought.