Desafíos matemáticos

What is a responsibility? How can you be responsible for yourself? Read this book to learn about how and why to behave responsibly.

It is the third Monday in January and school is closed. But do you know why? It's Martin Luther King Jr. Day. Turn the pages of this book to find out what dream Dr. King shared with the world, who Mohandas Gandhi was, how one brave woman helped Martin Luther King Jr. change history. Each book in the Holiday Histories series describes one of America's holidays or special days. Explore the history of each day and learn the real reason why it is important. Discover what special meaning each day might have for you.

¿Quién era Darth Vader antes de pasarse al Lado Oscuro? ¿Cuáles son las armas más originales utilizadas por El Joker? ¿Quién es el despiadado agente de Kaos más agradable de todos los tiempos? ¿Y el asesino serial más encantador y culto? ¿Qué héroes y heroínas esconden un pasado oscuro? Este libro reúne los secretos de los más variados villanos: desde los clásicos, como Drácula y Lex Luthor, hasta los expertos en artes oscuras, como Skeletor y Sauron. Sin olvidarnos de brujas, asesinos seriales y de animales que dejaron sus huellas infames en la historia de la ficción....

"Amphibians have some of the most interesting life cycles on Earth. The metamorphosis frogs, toads, salamanders, newts, and caecilians go through has many steps that readers need to understand and remember. This book offers a concise overview of the general amphibian life cycle as well as representative examples of the many species within the animal group. Most importantly, the accessible language is paired with diagrams of the steps of the life cycle to augment readers' understanding of this topic often found in the science curriculum."