La Energía Solar (Solar Energy)

Defines pulleys, 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.

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.

A Spanish edition of a popular look-for book is filled with translated rhyming riddles in which readers are invited to find hidden objects in a complicated arrangement of colorful objects.

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

Take a trip through the different forests of the world to discover where forests are located and what types of animals are native to forests. This book features colorful pictures, a detailed map of forests on earth, and vocabulary related to forests.

La guerra que se extendió entre 1914 y 1918 fue conocida hasta el estallido de la Segunda Guerra Mundial (1939-1945) como la “Gran Guerra”, porque sorprendió a todos los contendientes por su magnitud. Comenzó siendo un conflicto meramente europeo, pero con el tiempo se convirtió en una guerra mundial en la que participaron también americanos, asiáticos, africanos o australianos y neozelandeses junto a los europeos. La guerra duró cuatro largos años en un enfrentamiento como la humanidad no había presenciado hasta entonces. Los países participantes se contaron por decenas, los...