sciencehabit writes "A team of researchers has zoomed in on two spots on the body of the Iceman, a mummified, 5300-year-old hunter found frozen in the Alps in 1991: a shoulder wound found with an embedded arrowhead and a hand lesion resembling a stab wound. The scientists used atomic force microscopy, a visualization method with resolution of less than a nanometer, to scan the wounds for blood residue. They discovered red blood cells — the oldest in the world to be found intact — as well as fibrin, a protein needed for blood to clot. The presence of fibrin indicates that the Iceman, nicknamed Ötzi, didn't die immediately after being wounded."
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