By Hannah Wallace for Reasons to Be Cheerful Jimmy G. was a distracted and disruptive fifth grader. “In the morning, when he came in, he’d be up in everybody’s business, up and out of his chair, constantly blurting stuff out,” says Amy Young, his science and social studies teacher at Spooner Middle School in the North Woods of Wisconsin. (Unlike most middle schools, Spooner spans fifth through eighth grade.) But once Jimmy (whose name has been c…