Zombis, Fuerzas y Movimiento

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.

¿Por qué tienes que guardar turno en los columpios?. Descubre cómo los buenos modales hacen del parque un lugar seguro y divertido para todos.

What does it mean to be a good citizen? Full-page, color photographs accompany real-life examples of good citizenship that young readers will understand, relate to, and be inspired by.

Who were the earliest Americans? When, how, and from where did they enter and spread across the continent? And what is their relationship to modern Native Americans? Anthropologists develop theories to answer these questions based on the evidence they discover. Their theories—and the discoveries that prove and disprove them—are highlighted in this fascinating volume, full of awe-inspiring facts and incredible breakthroughs. Readers will feel like anthropologists and archaeologists themselves as they read about bones and artifacts, and what they reveal about the ancient cultures that roamed...