HARBOR BEACH ‒ Most elementary and middle schools fairly buzz with noise just before the school day starts, as a stampede of students put away coats, take seats and share boasts over video game exploits or exchange giggles about young romance. But one of the first things you notice at the Eccles School along rural stretch of Michigan’s Thumb is the quiet shuffle as students move from door to desk to computer station, creating a low-level hum until the Pledge of Allegiance. After which, there’s an exchange of news about soccer, a puppy and one student’s gig as bat boy...