Homework
When my dad survived Vietnam, the first thing he did when he returned was to propose to his girlfriend and begin a family in rural Mid-America. Being true catholics, our parents' only way to prevent pregnancies was the rhythm method, and they had no rhythm! Consequently, in five consecutive years, they had a girl, a girl, a boy, a girl, and a girl. By then, and I'm sure the law of averages can't suddenly be suspended, the parents either acquired rhythm really well or they just...