Chase Elementary School, is in a tough, almost entirely Spanish-speaking, Chicago neighborhood, yet 40 or so kids come to school an hour early each day just to take one of the company's Accelerated Reader computer quizzes.

FORBES: Instant feedback in the classroom

In Ms Stowe's experience, there are seasonal variations in divorce - but the blips tend to come in the spring and early summer - when school exams are over and term is coming to an end.

BBC: Season of ill will?