El ferrocarril transcontinental (The Transcontinental Railroad)

People today refer to the Midwestern and prairie states as flyover country. During the Civil War, crossing those areas was the biggest obstacle in uniting the East and West Coasts of our divided nation. An act of Congress in 1862 authorized the Central Pacific and the Union Pacific railroad companies to build a railroad that would link the coasts. Seven years later, on May 10, 1869, an overwhelmingly immigrant labor force completed the task when a rail line was join in Promontory, Utah. The states had become united at last.

Conecta con Pupi es el nuevo proyecto de Ediciones SM para el Primer Ciclo de Educación Primaria.Conectar con Pupi supone: *Entrar en una nueva y clave etapa educativa. *Desarrollar las competencias básicas. *Reflexionar sobre lo que se aprende y cómo se aprende. *Iniciarse en el trabajo colaborativo. *Utilizar las tecnologías de la información.Todo un reto, una apasionante aventura que será más amena y divertida de la mano de Pupi y los nuevos personajes. Las claves del proyecto son:Competencial. Aprender para la vida a partir de cuestiones de interés para encontrar soluciones...

Germs. Everybody has them! Some germs help people. Some germs can harm people. Add and subtract with tens as you learn all about germs. This Spanish math book combines math and reading skills and uses real-life examples of problem solving to teach subject-area content. The dynamic images, detailed sidebars, practice problems, and math diagrams make learning arithmetic easy and fun. Text features include a table of contents, a glossary, an index, and captions to build vocabulary and increase understanding of math and reading concepts. An in-depth problem-solving section provides additional...

Hay dos cosas que son ciertas aquí, ahora y siempre. La primera es que la historia la oficial, la de mayúsculas reverenciales la escriben los ganadores. La segunda es que esa historia no soporta el sentido del humor ni las paradojas, es decir las verdades a secas. Basta con que brinque un dato ignorado por los redactores de turno, las palabras inocentes de alguien que recuerde su infancia, un recorte amarillento, para que la Historia se convierta en caricatura de sí misma y los próceres, mártires y grandes gestas sean materia de guiñol. La consecuencia de aplicar el humor a la historia...

"Some things are so huge or so old that it's hard to wrap your mind around them. But what if we took these big, hard-to-imagine objects and events and compared them to things we can see, feel and touch? Instantly, we'd see our world in a whole new way." So begins this endlessly intriguing guide to better understanding all those really big ideas and numbers children come across on a regular basis. Author David J. Smith has found clever devices to scale down everything from time lines (the history of Earth compressed into one year), to quantities (all the wealth in the world divided into one...