Inteligencia artificial: computadoras y máquinas inteligentes (Artificial Intelligence: Clever Computers and Smart Machines)

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.

Las confesiones del joven Nern̤ es la historia del ascenso al trono de un muchacho. Desde la nięz hasta su transformacin̤ en un soberano universalmente cľebre, esta es una narracin̤ p̌ica sobre aquello que un hombre est ̀dispuesto a hacer para alcanzar el poder y, al mismo tiempo, sobrevivir

Beginning readers will be captivated by the creatures they meet in this Spanish translation of Prehistoric Creatures. The simple text describes ancient animals that swam the seas, soared through the skies, and roamed the Earth long before people existed. Each book describes a group of dinosaurs that shared one or two fascinating features. Dazzling illustrations help bring these amazing creatures to life!

Provides over 1,000 entries for terms in English and their Spanish equivalents, with sentences in both languages to show proper usage.