La Energía Solar (Solar Energy)

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

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.

Want to make cool apps and games, but don't know where to start? This straightforward guide gives you everything you need to start making your own fun programs, using simple step-by-step guides. Learn the programming languages Scratch and Python to create games, animations, utilities and more.

The author tells about the origin and development of two Spanish romances: The Alfambra woman buried alive and The lovers of Teruel. The first recounts the infidelity of a lecherous woman, the Countess of Alfambra, who betrays her husband by delivering him to his enemy; and whose final dénouement is the defeat of the adulterous couple and their being condemned to death by being burnt at the stake. The Story of the Lovers of Teruel recounts the tragic life of one of the members of the Marcilla family, enamoured of a rich damsel who returned his love. However, her father's refusal to consent...

A land of extremes, from active volcanic peaks to dense rain forests, Guatemala has sustained great civilizations and attracted foreign conquerors. While shadows of its vicious, decades-long civil war still linger, Guatemala's people work toward peace and stability in the face of corruption and impunity. Illuminating photographs, insightful facts, and informative sidebars help the reader discover what it's like to live in today's Guatemala, its ancient beginnings, dramatic landscape, rich culture, resilient people, and more.

Esta historia empieza una mañana de esas en que te aburres más que Spiderman en un descampado. Sabes de lo que te hablo, ¿verdad? Parece mentira que el día comenzara así... ¡y acabara con una de las aventuras más épicas de mi vida! Todo fue muy rápido: ver a ese desconocido entrar en su base secreta, colarme tras él sin ser visto... ¡e inventarme el reto de sobrevivir allí sin que me descubra! ¡A tope de pócimas de invisibilidad! ¡Venga escondites aquí y allá! En el momento me pareció divertido, pero nunca podría haber imaginado la montaña rusa de locuras que se me venía...