"It's where kids grow up in my world. It's like a boarding school, only we all live there full time," he explains.

A head-shake. "Not if they still want to be citizens. You can attempt the exam as many times as you need to pass it, as long as you're willing to do so. But anyone who reaches adulthood and refuses to take the exam, or who fails and doesn't want to try it again, they'll have to leave."