Cómo podemos utilizar la polea?

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

The Uses Of Wind Energy Is The Topic Of This Book. Explains The Positive And Negative Impact This Form Of Energy Can Have On Our World.

This inspiring biographical series ties in with elementary history, science, and social studies curricula, providing teachers with a valuable interdisciplinary resource. With these books, young readers will discover historical figures who devoted their lives to making the world a better place, and changed the course of history. Text copyright 2004 Lectorum Publications, Inc.

When Edward goes to school for the first time, he isn't quite ready to join in with the other children. The author delights us once again with her warmth and humor.

We use machines every day, but most of us don't understand how they work. When they break down, most of us have no idea how to fix them. Mechanics are the masters of machines. Readers learn that mechanics work on vehicles, including cars, boats, and buses. They use special tools to take them apart and fix what's wrong, and they use their experience and technology to diagnose problems. They often work long hours, sometimes in bad weather, to get us where we need to go. Your readers will see that mechanics keep our world moving and growing.

La historia de la pasión destructiva entre Ruth y Juan. Una novela que indaga en la búsqueda de la individualidad, las trampas y mentiras de los medios y la obsesión que mucha gente tiene por la fama como medio de superar las cargas del pasado.

Un juego que atraviesa los siglos sin envejecer: Monika Beisner ha seleccionado las más bellas adivinanzas de las tradiciones de todos los países. Los niños pueden jugar a encontrar en las bellas ilustraciones de Beisner las soluciones ocultas de los acertijos. Las traducciones del poeta José Emilio Pacheco le dan ritmo y encanto a los textos.