{"id":"48e9491c267bcb06b8c1fe5de8b38c135536c0e649df125e30d0f4edde648c59","title":"The Guardian Science reports: Fossilised red blood cells found in 115m-year-old dinosaur’s bone, say scientists","argument":"The Guardian reports that researchers led by Prof Kliti Grice say they found structures resembling red blood cells in the hind leg bone of an Aratasaurus, and chemical tests detected heme and its breakdown products. The dinosaur lived in what is now north-eastern Brazil 115m years ago. The researchers suggest that hausmannite, a manganese compound formed around the structures, may have helped preserve them. If the structures are red blood cells, the finding could open ways to investigate dinosaur blood, metabolism and activity levels; it could also prompt new questions about what can be learned from fossils already in museum collections. But the identification is disputed. Prof Mary Schweitzer points to the structures’ concave shape, rather than the dome-like form she expects from a dinosaur red blood cell, as a reason for doubt. She is more persuaded by the reported heme and collagen amino acids. Grice cautions that the work does not imply large biological molecules such as proteins or DNA survive in ancient fossils. The researchers’ claim, its proposed preservation mechanism and the potential for further study therefore remain distinct: the first is contested, and the latter two are possibilities, not established outcomes.","topicIds":["intelligence-and-discovery","power-and-infrastructure"],"domain":"science","claimType":"attributed reading","limits":"The identification is contested: Schweitzer argues that the structures’ concave shape suggests they may not be red blood cells. The proposed role of hausmannite in preserving the structures is presented as a possibility, not an established mechanism. 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The dinosaur lived in what is now north-eastern Brazil 115m years ago. The researchers suggest that hausmannite, a manganese compound formed around the structures, may have helped preserve them. If the structures are red blood cells, the finding could open ways to investigate dinosaur blood, metabolism and activity levels; it could also prompt new questions about what can be learned from fossils already in museum collections. But the identification is disputed. Prof Mary Schweitzer points to the structures’ concave shape, rather than the dome-like form she expects from a dinosaur red blood cell, as a reason for doubt. She is more persuaded by the reported heme and collagen amino acids. Grice cautions that the work does not imply large biological molecules such as proteins or DNA survive in ancient fossils. 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These all match the source, and source assertions stay attributed rather than presented as fact.","excerpt":"said Prof Kliti Grice at Curtin University in Western Australia who led the research team"},{"dimension":"summary","status":"uncertain","explanation":"The reading is faithful and balanced. Two gaps limit standalone understanding. First, heme is central evidence but is not explained; the source defines it, and the smallest repair is one clause, or a term-library tooltip, saying it lets haemoglobin carry oxygen. Second, the reading gives no source-supported link to Escape Meridian's AI and singularity scope. Admission confidence was 0.51, so fit is uncertain. Optional: Schweitzer's remark that conventional wisdom about organics vanishing is being routinely challenged would add force but is not essential.","excerpt":"heme, the organic compound that allows haemoglobin in blood to carry oxygen around the body"},{"dimension":"date","status":"pass","explanation":"originalPublished (2026-11-02T20:00:27Z, from the publisher page) matches the feed entry and the article URL date. The reading makes no conflicting date claim. The 115m-year age and the 2008 discovery are stated correctly.","excerpt":"The fossilised remnants of the Aratasaurus were discovered in a mine in 2008"},{"dimension":"support","status":"pass","explanation":"Each claim has an exact supporting excerpt. Possible benefits are kept conditional, matching the source's \"if confirmed\". Hausmannite is framed as a possibility, and the dispute is preserved. The question follows from Schweitzer's objection without asserting an answer. 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