Como Hacer Un Cohete Efervescente/How To Build A Fizzy Rocket

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...

Describes the U.S. Army Rangers, including their missions, vehicles, weapons, equipment, and duties. Written in English and Spanish.

Introduces fruits, uses simple comparisons to explore this group, and offers suggestions for healthy eating.

Una mañana, muy temprano, el cartero dejó en el buzón de la granja un paquete. Será comida? Será un tocadiscos? Cuidado, puede ser una bomba! Ojo, que va a explotar ...! Y se armó la revolución en la granja ... Pero no era una bomba, era algo muy distinto; algo que iba a llenar de emoción, suspende y aventura la vida rutinaria de la granja.