Matemáticas en Marte (Math on Mars)

Mysterious ancient ruins, hidden deep in the jungle of southern Mexico In May 1840, explorers John Stephens and Frederick Catherwood road their mules along a steep, muddy jungle path. They were hoping to find the ruins of an ancient, deserted site in Mexico they knew only from visitors’ accounts. Through the trees, they spied the remains of a crumbling stone palace. Palenque! In the weeks they spent there, the men discovered intricately designed buildings and mysterious glyphs, or symbols. Who built this city? What did the glyphs mean? The questions remained largely unanswered until the...

Lectura graduada para adultos para el aprendizaje de español como lengua extranjera. Nivel básico (A1-A2). Marca España es la nueva imagen que España quiere ofrecer dentro y fuera del país: la de una sociedad creativa, internacional y que busca la calidad. En cada libro se aborda un tema que va desde el mundo empresarial a la gastronomía, pasando por sus manifestaciones artísticas más importantes. Se incluye el CD con el relato completo y un vídeo.

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.

Although we rarely consider it today, it was remarkable that the small forces of the American colonies were the victors of the American Revolution. After all, England was the most powerful nation in the world at that time. This entertaining volume, an appealing way to present the important facts surrounding the Revolution, takes readers into the biographies of the Founding Fathers as well as George III and his advisors. The crucial events and decisions that ultimately led to England's loss are presented in an accessible narrative that will appeal to young historians and Revolutionary War...