Courtesy South Tyrol Museum of Archaeology via WikipediaOtzi, the five-thousand year-old corpse found frozen in a glacier in the Alps in 1991 has given up more secrets. Using a nano-sized probe, scientists at The Institute for Mummies and the Iceman in Bolzano, Italy have successfully extracted from the 5300 year-old "Iceman" the oldest samples of human blood known. The find surpasses that of Egyptian mummies by 2000 or so years, the previous record holder. What's more, the researchers have determined that Otzi died fairly quickly after taking an arrow in the back. Fibrin, a blood clotting protein that appears in fresh wounds then disappears as healing progresses, was present in the samples. This means the healing process stopped soon after Otzi was shot.