Italian prehistoric iceman's blood found
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Scientists say they have found what is believed to be the oldest traces of human blood ever.
The blood cells were found on the remains of Otzi, Italy's prehistoric iceman who roamed the Alps 53-hundred years ago. Scientists used an atomic force microscope to examine a wound on Otzi that caused his death. They say the red blood cells found on the wound are similar to modern-day samples and show their ability to survive for thousands of years. The discovery may help lead to a more precise determination of the age of blood spots in crime investigations.