Science and health lend themselves easily to PBL (passion or project-based learning) in my mind. But I wasnâ€™t sure how I was going to make it all work in a social studies unit about relationships, rules and responsibilities. I want this to be based on what the students are interested in. Yet there really is nothing about the words â€œrelationships,â€ â€œrulesâ€ and â€œresponsibilitiesâ€ that has the ability to inspire passion in most six-year olds. But then I thought about our six Nintendo DS gaming devices.