Por qué algunos animales tejen telarañas (Why Animals Live in Webs)

In AD 79, the residents of the booming Roman city of Pompeii were shocked when a nearby mountain exploded, releasing superhot ash, rock, and gas on the surrounding areas. What happens next is the extraordinary account of a volcano in action. Though the people who didn't flee Pompeii were doomed, the volcano preserved their remains, allowing us to better understand a fascinating time in the Roman Empire. Astonishing photographs of Pompeii, primary source records of the occurrence, and riveting text are just some highlights of this high-interest volume.

Una gran epopeya histórica con aires de leyenda. La historia de una ciudad sometida que anhelaba la libertad y del hombre que luchó por alcanzar ese ansiado milagro. Amor, ambición, secretos, venganzas y traiciones se entrelazan sobre el fondo de una época oscura y fascinante. En el siglo IX, Barcelona se encontraba en los confines más lejanos del Sacro Imperio. Gobernada por los francos desde la distancia, la ciudad, de apenas mil quinientas almas, se había convertido en una tierra abandonada, asolada por intentos de conquista de los sarracenos y las hordas salvajes, y sometida a la...

Having a job and earning money are a part of everyday life for most people, especially adults. The concept seems fairly straightforward: one works to earn. This volume discerns the difference between a job and a career, as well as how a job can develop into a career. Readers will learn why a community's economy needs jobs, how paying someone to do a job helps the person who is paying them, and even about job loss and its consequences. The text also explains different jobs and their effects on the economy, such as those of professional, production, arts, and government and military jobs.

Esta colección de pequeños alienígenas guardianes de la naturaleza que salen de su planeta en persecución del mayor contaminador del universo, el perverso Zirt Zlunder. Él huye y viene a parar a la Tierra. En este libro Zirt Zlunder el contaminador está contaminando los océanos, donde se escondió camuflando como una isla. Los pequeños guardianes localizaron Zirt Zlunder y le impedirá contaminar los océanos. ¿Ellos tendrán éxito? ¿Ellos conseguirán arrestar Zirt Zlunder el terrible contaminador?