Some time ago, we introduced an equation meant to help predatory teachers in navigating the treacherous waters known as Boning Your Students: Radar's Teacher Jailtime Calculator (™ pending). Though it requires a modicum of algebraic know-how, it makes sense: plug in the numbers and, presto!, you know whether or not this little sure-to-be-discovered tryst will be worth it. Not surprisingly, few are doing their homework—they're too busy boning their students: