Parenthood is a never-ending series of pop quizzes for which you can’t possibly study. My latest test: older kids fighting loudly about who has to walk the dog (when I’m the one who walks her 90% of the time), while six-year-old is almost tearful about trying to memorize a poem for recitation tomorrow, while somewhere in the background, my four-year-old announces “I just put my fart in the refrigerator.”