Trayectoria de choque: Los asteroides y la Tierra (Collision Course: Asteroids and Earth)

Alexa y otros ni�os de su escuela en Costa Rica tienen un proyecto especial: ellos est�n criando cocodrilos americanos. Ella nombra a su cocodrilo "Jefe" porque parece que �l est� a cargo de los otros. Alexa le trae pollo y ranas para comer y escribe acerca de su progreso en su diario. Muy pronto, su peque�o cr�o est� tan grande como una barra grande de pan. Se ha convertido en un cocodrilo joven y es tiempo de que Alexia le diga adi�s y que Jefe regrese a la vida salvaje.

Let’s Play, Mom! - Spanish edition A touching story told by a first grade girl. A girl who finds a way to make her mom feel better and happier. Nothing can be more precious than the time they spend together playing. This children’s story has a message for children and parents alike, teaching kids compassion and creativity, while reminding parents the importance of quality time with their children.

Texto y fotografías sencillas demuestran diversas maneras de ser provechoso y de demostrar que te importa tu prójimo.

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...