La cara oculta de (la llegada del hombre a) la Luna

Brief biographies of well-known men and women, from ancient time to the present day, who made significant contributions in various fields.

Children learn about the features of Tyrannosaurus Rex, what Tyrannosaurus Rex ate, and how it attacked other dinosaurs.

Este libro, Jugar a pensar con cuentos, narra las aventuras de la simpática mariquita Juanita que viajando por el mundo trae distintos cuentos, como recuerdos, en su mochila. Y como ese personaje sigue inquieto, su historia si llena de cuestionamientos sobre todo lo que los cuentos le hacen pensar. Este libro es un viaje reflexivo que invita a los niños a pensar mientras se divierten con Juanita y sus interrogantes.

As a land that’s constantly in flux, Earth sometimes reveals clues about the plants, animals, and other organisms that lived long ago. Fossils teach us much about what life was like millions of years ago, answering the questions of how Earth changed and maybe even why it changed. This essential Earth science topic is thoroughly explained through manageable text, fact boxes, informational charts and diagrams, and a glossary and index. Readers will become young Earth detectives by the time they’re through with this text!

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.