We give tours to dozens of college students each year. Most of them come primarily to learn about Greenbelt history, but some of my favorite groups are here not just to learn about the history but also to learn about working in museums and historic sites and what makes some successful and others less so. These discussions go in many different directions, but I always eventually end up getting to what I call the Three R's: Responsibility, Relevance, and Revenue. We have an ess