Obedecer las reglas

La hibernación es un ciclo que algunos animales hacen cada año. La mayoría de la gente sabe que los osos hibernan. ¿Pero por qué hibernan? ¿Y qué otros animales hibernan? Hibernation is a cycle that some animals go through every year. Most people know that bears hibernate. But why do they hibernate? And what other animals hibernate?

Este libro –cuenta William H. Hodgson en su introducción a «Los piratas fantasmas»– puede ser considerado el último de un grupo de tres. El primero se publicó bajo el título de «Los botes del “Glen Carrig”»; el segundo, como «La casa en el confín de la Tierra»; por fin, este tercero, completa lo que, quizá, pueda ser considerado una trilogía; pues, aun cuando los tres difieren mucho en los contenidos, todos ellos coinciden en una determinada forma de tratar unos conceptos elementales. Con este libro, el autor cree que cierra una puerta, en cuanto a lo que a él concierne, ...

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.

What substance can act like both a solid and a liquid? Slime! Want to find out how to make your own? Just follow the simple steps inside this book

From war and death to school and gender equality, the Sociedad series discusses many serious issues in a way that can be easily understood by children. Although many of the situations and examples are specific to Mexico, these books can be applied to a general readership, particularly one of Hispanic origin. Reflecting on modern sciences, particularly biotechnology—from its limitations to its advances—this perceptive study answers many questions concerning cloning and genetically modified organisms, such as Why do scientists work in these arenas? What are the benefits of this technology?...