Cómo podemos utilizar la palanca?

Define planos inclinados, explica sus funciones, y sugiere experimentos sencillos para demostrar cómo funcionan.

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.

Young students will be enthralled with compelling portraits of famous figures who devoted their lives to improving the world. Includes historical photos and illustrations.

¿Qué tan preparado estás para criar a tu bebé durante sus primeros meses de vida? Pocas cosas pueden comprarse con los primeros meses de vida de un bebé, pues son los que tendrán el mayor impacto en su desarrollo e infancia. Sin embargo, tanto los padres primerizos como los veteranos concuerdan en que el primer año de vida de un bebé es de las etapas más difíciles de enfrentar. Con esta guía, aprenderás lo siguiente: Cómo alimentar a tu bebé apropiadamente para promover su desarrollo y salud en su primer año de vida. Cómo lograr que tu bebé tenga buenos hábitos de sueño y...

Eleven-year-old Jenny, whose family came from Russia to America to start a new life, meets the famous Russian composer on his 1891 trip to the New World and writes about it in her diary.

In each book in this series, a boy speaks about one of four dinosaurs. The text stimulates the reader’s imagination and considers the characteristics of each dinosaur, highlighting the features that distinguish it from the others.

An introduction to what cowboys do, what their day is like, what they wear, what tools they use, and how people can become a cowboy.