Chester El Perro Que Aprendio a Volar

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.

Where is your brain exactly? What does it do? Use your brain to read this engaging, Spanish-translated title and learn all about it!

¿Está prevista una misión humana a Marte? ¿Cómo se captura un cometa? ¿Cómo es el centro de la Tierra? ¿Existen los extraterrestres? ¿Es posible enseñar a nuestro cuerpo a curar las heridas? ¿Conseguiremos viajar en el tiempo? ¿De qué está hecho el Universo? ¿Cómo serán los videojuegos del futuro? ¿Seremos los seres humanos sustituidos por robots? ¿Cuáles son los descubrimientos científicos que cambiarán nuestras vidas en el próximo medio siglo? En este libro encontrarás algunas preguntas que te has hecho sobre el futuro y sus respuestas; con él, entenderemos mejor el ...

The need for speed is the motivating factor in this engaging, Spanish book. Readers learn the history of travel from the very slow to the supersonic and beyond, including everything in between. They learn and discover the factors that influence motion for all types of vehicles: land, air, and water alike. They also learn different ways to measure speed and read about energy uses for different vehicles. With greater speed comes greater risk. Readers learn how engineers are always seeking new and better ways to keep people safe as they travel faster and go farther. This 6-Pack includes six...