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They turned to a device called an atomic force microscope, which works by "feeling" rather than "seeing" an object. The minuscule probe, itself invisible to the naked eye, runs over the object like a needle on a record player. As the probe bumps up and down along the object's contours, a laser measures the movement. The result is a three-dimensional "tracing" of the object.
While other researchers have attempted to identify blood on older stone tools, this is the oldest definite confirmation of blood, Zink said. The find may help advance forensic science, because current crime-scene technology has trouble differentiating between old and new blood, he said.
Originally posted by watchitburn
This new study (released August 2, 2010) provides the most information to date about the iceman's DNA. Two earlier studies (see below) analyzed his mitochondrial DNA (mtDNA) which provides information about his female ancestors. The new study--with its complete genome--opens the door to a wider population of matches. By the twentieth anniversary of the Iceman's discovery (September 19, 2011), scientists are hopeful that a few modern-day relatives might be found.