1. What is Libros Maravillosos? Libros Maravillosos (Spanish for "Wonderful Books") is a free, non-commercial digital project founded by Carlos Galindo (also known as "Patricio"). Its mission is to promote science, mathematics, and critical thinking by offering a curated collection of high-quality popular science books in Spanish. The catalog is legendary among Spanish-speaking readers for its focus on clarity, depth, and wonder. Key fact: All books are legally shared with permission from authors or publishers, often out-of-print or with special arrangements. 2. Core Themes of the Catalog The catalog spans several interconnected areas, always prioritizing accessible yet rigorous science communication.