Joel leyner propounded two axiomatic truths for the entirety of his son Mark’s childhood: 1. Someday every single person will possess his or her own helicopter and commute to work in it; and 2. A dog’s mouth is actually cleaner than a person’s. well, so much for fatherly wisdom. Although Leyner never really bought the helicopter prediction-seemed like too much of a rush-hour nightmare-the dog’s mouth assertion seemed plausible. But the ol’man was wrong on that score too. When the oral cultures from ten randomly chosen people were compared to samples from the mouths of ten randomly chosen hounds, guess what? The “yuck factor”-that is, bacterial colonies per square centimeter-was greater in the majority of mutt mouths than in the person pie-holes. No wonder Luck hated it when Snoopy kissed her.