La naturaleza de la materia (The Nature of Matter)

In this biographical book, young readers will learn about the brave life of Harriet Tubman. Readers will discover how Tubman bravely escaped from her life as a slave to cross the Mason-Dixon line into freedom and how she helped hundreds of other slaves into freedom through the Underground Railroad with the help of abolitionists. The vivid images, stunning facts, and supportive text work in conjunction with the helpful glossary, index, and timeline of Tubman's life to give readers an engaging experience as they move from cover to cover. This book has been translated into Spanish.

What did people use to buy things before money was invented? Where is money made? Find out in this inviting book that informs readers about coins, paper money, the Federal Reserve, exchange rates, and checking accounts. Featuring a timeline of money's history, detailed photos, stimulating facts, clear, informational text, and a glossary that will assist in improving vocabulary, this Spanish-translated nonfiction title will keep readers engaged from cover to cover.

Read Along or Enhanced eBook: Take a journey into the wild world of reptiles and amphibians! Readers will learn about crocodiles, lizards, snakes, tortoises, and salamanders. Featuring a glossary, index, colorful images and charts, intriguing facts, and clear, informative text, readers will be sure to be enthralled as they move through this engaging, Spanish-translated book.

¿Qué ocurre el día en que a un niño le privan de su más querido objeto el chupete porque le dicen que ya es mayor? Mario llora y grita de rabia porque para él su chupete es fantástico: cuando lo lleva, se le aparecen un mar y un barco de vela, una oveja blanca comiendo hierba y una gallina roja con sus tres polluelos... Pero a partir de esa noche todo será diferente. Mario quiere a toda costa su chupete. Solo el cariño de su madre le calmará.

El ser humano no está estructuralmente preparado para desenvolverse de forma óptima en el medio acuático, sin embargo, tiene la capacidad de aprender para mejorar su competencia. En este libro se presentan los condicionantes de la estaticidad y del movimiento del cuerpo en el medio acuático, distinguiendo los elementos que son propios del agua de los que son propios del cuerpo, para determinar qué factores son los que se pueden mejorar para optimizar el dominio de este medio. Además, como complemento fundamental, se integran en este proceso las áreas del control motor, la...

This book is a comprehensive, practical presentation of the principles of behavior modification and guidelines for their application. It teaches forms of behavior modification ranging from helping children learn necessary life skills to training pets, to solving personal behavior problems.

We are a nation of immigrants. Even many of the faces we see on TV and in the news are recent immigrants. Meet these new Americans and learn their stories, whether they are athletes, musicians, artists, politicians, or businesspeople. Discover how all immigrants, along with natural-born American citizens, form a mosaic of different cultures and traditions. Written in standard Latin American Spanish.