Child psychologist analyzed what parents and teenagers say and what they really mean: “Yes, they're exaggerating. But there's nothing they can do about it.”

Never — ever — call a teenager a teenager. This is the first advice that child psychologist Klaar Hammenecker (51) gives to parents in her book Leave it. After questioning more than three hundred teenagers and dozens of parents, she carefully combed out what they say to each other and what those conversations are really about.