La Energía Solar (Solar Energy)

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

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.

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

In an entertaining way, shows how to add, subtract, multiply, and do long division without a calculator.

Say hello to heroes! This book introduces preschoolers to 50 men and women of color who have changed the world! Desde Toussaint L'Overture, el líder de la Revolución haitiana, hasta la jueza Sonia Sotomayor, la primera puertorriqueña jueza de la Corte Suprema de Estados Unidos, estos héroes y heroínas persistieron contra la adversidad y las dificultades para lograr un cambio positivo.From Toussaint L'Ouverture, the leader of the Haitian Revolution, to Justice Sonia Sotomayor, the first Supreme Court Justice from Puerto Rico, these heroes have persisted through adversity and hardships to...

El método Protagonistas se compone de cuatro volúmenes que cubren el nivel B2 del Marco común europeo de referencia para las lenguas: enseñanza, aprendizaje y evaluación. El Cuaderno de refuerzo Protagonistas B1 es un material de apoyo y práctica de los contenidos del Libro del alumno. Consta de 12 unidades de 4 páginas con actividades de refuerzo. Cada unidad refuerza los contenidos presentados en el Libro del alumno para fijar y sistematizar las estructuras gramaticales y el léxico. Las actividades se presentan en una estructura paralela a la del Libro del alumno, de forma que se...

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.