People living in Russia about 20,000 years ago built a “bonehenge” – a circular structure made of mammoth bones that could have been used to store food
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https://www.newscientist.com/article/2237336-bonehenge-stone-age-structure-of-mammoth-bones-discovered-in-russia/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
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