A 20-foot long inflatable colon with pink walls, red arteries and bright round polyps painted on the inside became part of a 50-city summer tour designed to emphasize that colon cancer is the second leading cause of cancer deaths in the U.S. While many who walked through the tunnel at health fairs and festivals described it as “gross”, physicians applaud it as a powerful way to entertain while illustrating what’s going on inside our bodies. A transplant physician at the University of Minnesota loved the idea so much that he ordered a 10’ x 12’ custom made bone marrow tunnel to promote a bone marrow transplant program.