Writer and National Geographic Explorer Paul Salopek is on a 24,000-mile (38,000-kilometer) storytelling trek across the world called the "Out of Eden Walk." The National Geographic Society, committed to illuminating and protecting the wonder of our world, has been the primary sponsor of Out of Eden Walk since 2013.Follow the journey on Instagram @outofedenwalk and sign up for the project newsletter here to receive stories directly to your inbox.