All kids can be a helper at home, by cleaning their bedrooms or feeding the dog. Let's explore ways to be a great helper at home The D as de Descubrimiento (Discovery Days) series is perfect for young learners in prekindergarten through grade 2. These 16-page books give readers an accessible introduction to nonfiction reading. Color photographs and fun, factual examples will grab the attention of young readers and help strengthen reading comprehension skills.