Turno de noche

For many years, people believed there were nine planets that orbited the sun. Now we say there are eight. What happened to the ninth planet, Pluto? What are the different planets like? What exactly makes a planet a planet? These are the many intriguing questions answered with this high-interest book, crafted to be accessible for readers of all levels. Young astronomers will be especially fascinated by the stunning photographs and the "Make the Grade" fact boxes.

En esta segunda edición, ampliada y revisada, de «Una espléndida sinceridad» se da información biográfica sobre Robert Louis Stevenson; se hace después un comentario de conjunto a su obra; luego, por orden cronológico, se reseñan cada uno de sus libros de ficción; y, por último, se incluyen comentarios acerca de sus obras restantes —de poesía, libros de viajes, ensayos de distinto tipo—. Junto con «La eficacia del optimismo», sobre Charles Dickens, y «Formas de la felicidad», sobre varias obras y autores decimonónicos, este libro tiene como uno de sus objetivos ampliar ...

Readers will learn about the important relationship between producers and consumers as well as buyers and sellers and how they all work together to create a healthy economy. This instructive volume defines basic economic concepts like goods and services and explains production with examples of the different types of production. It also covers the primary and secondary industries that produce goods. Concepts such as marketing and advertising are also covered, for a well-rounded view of this fascinating aspect of the economy.

Simple text and photographs introduce the animals of the Arctic, grouped to provide practice in solving easy addition problems.