Pregúntale a Sésamo is a 25-volume set of children's books was published in conjunction with Barrio Sésamo, the Spanish co-production of Sesame Street. Each book has about 15 pages and is illustrated in color. The books answer questions about why things are and how they work. There is also a recurring feature called "Bert and Ernie's Attic" which features either very short (three-sentence) stories or riddles and guessing games. Some books also include suggestions for games to play related to the theme of the book.