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Ancient mammoth-tusk boomerang is twice as old as we thought | New Scientist
https://www.newscientist.com/article/2485925-ancient-mammoth-tusk-boomerang-is-twice-as-old-as-we-thought/
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A boomerang discovered in a Polish cave was originally dated as 18,000 years old, but it may have been contaminated by preservation materials. A new estimate suggests the mammoth-ivory artefact is 40,000 years old