Anthropologist Albert Zink is trying to solve a classic "cold case": the death of Ötzi the Iceman, the famous mummy preserved in the frozen Italian Alps for millennia. For Zink, the real mystery lies in the ways Ötzi's remains might inform modern-day studies of heart disease. Read more about Zink's research on Ötzi: onward.nationalgeographic.com/2013/10/31/a-5300-year-old-mummy-with-keys-to-the-future/ Onward is a project to explore the world and share its untold stories. Hit the road with National Geographic multimedia journalists Spencer Millsap and Dan Stone at onward.nationalgeographic.com, or tweet them at @spono and @danenroute to join the conversation.