After Jeff Shaver survived a devastating fall in 2010, he and his wife reevaluated their lives. They felt he’d been given a second chance, and they wanted to make the most of it by contributing something meaningful to the world. Their son Lee, 30,a UW-Madison graduate student in electrical engineering, had an idea. Years earlier, as a new college graduate seeking a purpose, he had joined the Peace Corps at his parents’ urging. He suggested they do the same.