Children often ask many kinds of questions that adults can not answer. "Why do earthquakes occur on Earth?" "What is space? What is there in space?" "Will dinosaurs eat dinosaurs?" “Why does the puppy only bark?”...... Every parent has a deep understanding. When the child's most interesting period has passed, it has become one hundred thousand why. And they need a book they can read. We call this type of book an Enlightenment Book.