"The perfect balance of humor and gravity. . . . Equally useful as a lesson on social-emotional dynamics and as a story, this book has a place on every shelf." --Kirkus Reviews (starred reviews) Wouldn't the world be a better place if everyone knew how to apologize? Luckily, this humorous guidebook is full of practical tips about when, why, and how to say you're sorry. From a porcupine who accidentally popped his friend's...