We travel to experience awe or learn something new — maybe even to get our worldview shaken up a bit. On this episode, The Pulse explores how travel changes us and how we change the places we visit. Also heard on this week’s show: Science history geek Michael Yudell tells us about 19th century explorer John Cleves Symmes who believed the earth is hollow. Travel medicine expert Phyllis Kozarsky says don’t blame the airplane for your stomach bug. Reporter Liz Tung explores the future of biometric scans in travel security screening. Astrophysicist Jarita Holbrook says her annual trip to the meeting of the National Society of Black Physicists feels like coming home. Kiasha Huling recalls the culture shock she experienced when she traveled just a few miles to college. New Zealand tourism expert Ian Yeoman predicts where we’ll want to travel in the next 20 to 50 years.