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.

Stefan Zweig tuvo durante toda su vida la necesidad de intercambiar correspondencia, de establecer y mantener contactos. Mediaba la veintena cuando empezó a enviar sus primeros libros, junto con unas líneas de cortesía, a personalidades ya célebres por aquel entonces. Muchas de las respuestas dieron pie a una relación personal cuyos testimonios se han conservado. Con el presente volumen, los compiladores han querido transmitir una impresión lo más concreta posible tanto del peculiar talento de Stefan Zweig para dirigirse a sus corresponsales como de sus manifestaciones personales. Para ...

[English] What is the difference between a savanna and a prairie? How do bison, zebras, and other grazers avoid hungry grassland predators? Trek across the plant-covered landscape of this book, and find out what makes grasslands one of Earth's treasures. [Spanish] ¿Qué diferencia hay entre una sabana y una pradera? ¿Cómo escapan los bisontes y las cebras de los depredadores? Camina entre los altos pastos de este libro. Descubrirás por qué los pastizales son uno de los grandes tesoros de la Tierra.

It was known as the age of the dinosaurs, but other fascinating creatures roamed the Earth at the same time. Learn about lesser-known animals from the prehistoric era that are no less fascinating! Students will be engaged in reading about ancient animals like Gigantopithecus, Titanoboa, Megalodon, and more as they develop their skills at reading and writing numbers. This Spanish math book combines math and literacy skills, and uses real-life examples of problem solving to teach subject area content. The full-color images, intriguing sidebars, practice problems, and math diagrams make learning ...

Kate Middleton’s dedication to charitable work makes her a role model for all young people. Her role as a member of the British Royal Family has given her a platform to speak for various humanitarian causes, showing readers the importance of helping people who are less fortunate than themselves. Middleton’s amazing life story is presented to readers alongside full-color photographs and informative sidebars. Quotes from Middleton are included to inspire readers. A helpful timeline of the most important events in her life allows readers to place important biographical details in...