Post B9Onv4oDhqTP9Xel3Q by kim_harding@mastodon.scot
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 (DIR) Post #B9Onv4oDhqTP9Xel3Q by kim_harding@mastodon.scot
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       Were these ancient rock images painted with human blood?https://www.science.org/content/article/were-these-ancient-rock-images-painted-human-bloodMacabre ingredient may have helped murals on Chinese cliffs survive nearly 2000 years of weathering