1728 alien combinations in this mix and match book! Just out in December 07, this book is capturing imaginations young and older everywhere. The most consistent comment I get is from mothers that this book keeps their kiddoes occupied in the back seat of the car for a long time! A GOOD THING! Look for my next mix and match in the next year or so ZANY DOGS AND CATS will fill the pages and then DINOSAURS are going to get mixed up too!