Discover Series Books for Babies & Toddlers Did you have a rock collection as a child? Would you like to encourage an interest in the natural world in your kids? Discover rocks, minerals and shiny stones in this book of gems. Used as a jumpstart for interaction, Discover Series Picture Books are a great way to introduce new images, words and concepts to kids. Use this photo dictionary as a learning tool. Each photo has a clear title beneath it for identification. Language learners, children, and people looking to build their vocabulary can use this simple book to learn new words.