Energía del viento

Defines levers, explains their functions, and suggests simple experiments to demonstrate how they work.

Defines screws, explains their functions, and suggests simple experiments to demonstrate how they work.

Follows the life and career of the French scientist who proved the existence of germs and their connection with diseases.

Perfect for readers interested in learning more about other faiths, this unique collection offers an in-depth look at the major religions of the world. Rich with fascinating facts, each edition includes illustrations, photographs, glossaries, and information on the history, customs, and doctrines of each religion. By offering readers a deeper understanding of the beliefs of others, this collection encourages tolerance and respect in an increasingly multicultural world. Perfecto para lectores interesados en aprender sobre otras religiones, esta colección única ofrece un análisis profundo de ...

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...

In this illustrated adventure, Hannah has a broken leg, and learns how her friends can be of great help. Books of the Neighborhood Readers Program build early literacy skills, introduce important content-area language, and help develop speaking and writing skills. They can be integrated into any existing language arts or core reading programs.

En esta obra de teatro, Quique y Teresa, los dos hermanos protagonistas de la historia, comparten aventuras con dos personajes de juegos de ordenador, gracias a un invento del padre, un chip que está desarrollando para hacer que la sensación de realidad virtual de los juegos sea casi real.