Delfines y Ballenas

¿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....

The gold dollar coin bears the image of one of the most famous Native Americans in U.S. history; Sacagawea. Though much of her life remains a mystery, this book explores the story of this extraordinary woman who helped Lewis and Clark explore the American West. Age-appropriate language and content will help beginning readers understand this fascinating time in American history and introduce them to Sacagawea's captivating story. Exciting photographs help draw readers in, and a timeline of important events will reinforce what they've learned.

Eco-Friendly Energy Is Explained. The Most Current Information Is Provided While Establishing The Understanding That It Does Not Take Much To Make The World A Better Place.

In this stimulating, Spanish-translated nonfiction book, readers will discover the various types of friction--including rolling friction, sliding friction, fluid friction, and static friction--and the huge impact it has on nature, machines, and our lives. In addition, readers are encouraged to perform basic experiments to assist in the understanding of friction, kinetic energy, and water resistance. With real-life examples, colorful images, accommodating graphs and charts, and informational text, this title will inspire and engage children.