By using an innovative non-invasive photographic technique, European researchers have managed to locate and map the extensive set of tattoos on the exquisitely preserved remains of Ötzi the Iceman. Remarkably, they even found a previously unknown tattoo on his ribcage. Ötzi's frozen remains were discovered by two German tourists in the Ötzal Alps on the border between Austria and Italy in 1991. He lived around 3,300 BCE and represents Europe's oldest natural human mummy. Because he was so well preserved in ice, he has provided anthropologists with a slew of information about Copper Age (or Chalcolithic) humans. ... It's worth...