La civilización griega

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.

Explains the basic science of flight, the problems of getting vehicles into the air, different types of engines, and aircraft design, and includes instructions for making aircraft models.

La historia de la ciencia no es ni más ni menos que la historia de nosotros, los seres humanos, tratando de entender y explicar el universo que nos rodea. Y, como nosotros mismos, es contradictoria, misteriosa, intrigante, traicionera, ambiciosa, valiente y, por momentos, insólita. En este libro vas a conocer a personas curiosas, perseverantes, observadoras, testarudas e ingeniosas, y vas a acercarte a los caminos que las llevaron a descubrimientos increíbles, errores catastróficos y, sobre todo, a hacerse nuevas preguntas. La historia de la ciencia está llena de sorpresas, personajes y...

Wind Power: A waving flag, blowing leaves, a kite soaring through the skyall are moved by wind power. Wind is also our fast-growing source of energy. Find out how wind forms and the different ways we may use it in the future.