Algoritmos: la base de la programación de computadoras (Algorithms: The Building Blocks of Computer Programming)

From art and architecture to politics, philosophy, and mathematics, "western civilization" owes a great deal to the achievements of ancient Greece, but what do we really know about this long-gone civilization? How did geography influence the politics of the Greek city-states? What's the difference between an agora and an acropolis? This book takes readers several thousand years into the past, when independent city-states ruled the Mediterranean Sea, to find the answers. Full-color photographs and maps, accompanied by accessible text, introduce readers to the many contributions the ancient...

What is matter? Anything that takes up space is matter. Matter can be a water, liquid, or gas. These are the states of matter. Learn about matter with this Spanish science reader that features easy-to-read text. Nonfiction text features include a glossary, index, and detailed images to facilitate close reading and help students connect back to the text. Aligned to state and national standards, the book also includes a fun and engaging science experiment to develop critical thinking and help students practice what they have learned.

In today's chaotic world, opportunities abound for youth to disengage from community and worship. Once this happens, young people often don't come back. The National Federation for Catholic Youth Ministry wrote From Age to Age in 1997 as part of multiple-year response, to increase youth participation in worship. The document sparked national dialogue on how Roman Catholic parishes might best reach out to and involve youth in Catholic worship. From Age to Age revisits the liturgical principles of Vatican Council II and applies them in creative ways. The document provides strategies to help...

Introduces the life and times of Underground Railroad and anti-slavery leader Harriet Tubman and explains her place in American history.

La idea de escribir este libro surgió al leer una publicación que vi, hace ya un tiempo, en la que se hablaba de historia y se trataba de forma «científica», según el autor de dicha publicación. Este señor venía a decir que en la época del emperador Trajano se construyeron los primeros castillos de España..., la verdad es que me quedé “de piedra”, y sin palabras y casi sin aliento, pensar que un afamado historiador pudiese hacer esas afirmaciones y quedarse tan tranquilo, me dio que pensar en el sinfín de errores históricos que hemos dados por buenos y de los cuales...