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.

He aquí la crónica de lo que fue llamado el acontecimiento mundial de la década de los setenta- la gira de los Rolling Stones por los Estados Unidos Un frenético carrusel que atravesó el país y alcanzó su clímax en Nueva York Inmersos en el torbellino, as

For Barack Obama, becoming president of the United States brought big changesfor him, his family, and the country. Every day he faces important meetings, tough decisions, and the opportunity to meet new people. But he still finds time to invite friends over for a movie and walk Bo, the White House Dog, with his daughters, Sasha and Malia. How does he do it all? Follow the President through his day and find out what it's like to be Barack Obama. Para Barack Obama, convertirse en presidente de Estados Unidos fue un gran cambio, tanto para l, como para su familia y para el pas. Todos los das...

What keeps objects from floating out of your hand? What if your feet drifted away from the ground? What stops everything from floating into space? Gravity. As in his previous books, Redwoods, Coral Reefs, and Island, Jason Chin has taken a complex subject and made it brilliantly accessible to young readers in this unusual, innovative, and very beautiful book.

A través de un sencillo paso a paso y de divertidos retos, lo conseguirás en un periquete. Mitch y Scratchy serán tus guías. ¿Todo a punto para esta aventura? Scratch es un lenguaje de programación muy popular y sencillo utilizado por millones de personas en el mundo. Al arrastrar cajas bloques de código de colores se pueden aprender fácilmente los conceptos básicos de la programación y hacer videojuegos y animaciones. Solo necesitas un ordenador y conexión a la red.