Usborne Lift the Flap First Questions and Answers: Why Do Things Die?
Very First Questions and Answers: Why Do I (sometimes) Worry?
Usborne Very First Questions and Answers: Why Should I Say Sorry?
Paws, Claws, and Snapping Jaws
Usborne Lift-the-Flap: Look Inside a Coral Reef
Usborne Lift the Flap First Questions and Answers: Why Should I Get Dressed?
Smithsonian Kids: 100 Curious Words to Know
