Thomas Edison

For many years, people believed there were nine planets that orbited the sun. Now we say there are eight. What happened to the ninth planet, Pluto? What are the different planets like? What exactly makes a planet a planet? These are the many intriguing questions answered with this high-interest book, crafted to be accessible for readers of all levels. Young astronomers will be especially fascinated by the stunning photographs and the "Make the Grade" fact boxes.

Por este libro desfilan iglesias, monasterios, santuarios, capillas, los castros, pazos y castillos, romerías y reparadoras fiestas de remotos orígenes. Hay además una ruta literaria, imprescindible dado el excelente número de escritores gallegos, entre los mejores del siglo XX español. Las rutas se interrelacionan: por la monumental se llega a la almenada, por la devota a la monumental, por la festiva a la devota, por la literaria a la monástica...

What does swimming in a pool, drinking through a straw, breathing in air, and circulating blood all have in common? They all require a form of air or water pressure! Readers will discover the variety of ways that air and water pressure make an impact on our lives and the things in them. This fact-filled, Spanish-translated nonfiction title includes real-life examples and basic experiments to aid in the development of understanding physic and scientific concepts. Readers will be introduced to and learn about Archimedes Principle, atmospheric pressure, vacuums, water density, and hydraulics...

Life Long Ago brings ancient civilizations to life and reinforces important early elementary social studies standards such as time, continuity, and change. Students will learn what daily life was like, how ancient peoples governed themselves, how they communicated, and how the influences of ancient cultures are still felt today.