Agujeros negros (Black Holes)

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.

Gretchen es una chica de catorce años. Ella y su familia, los Sackmeier, son conocidos en el vecindario como los “Cinco Sacos”. Todo empieza a cambiar cuando su madre, Elisabeth, se rebela y decide darse una oportunidad como mujer: se pone a trabajar con el deseo de poder retomar los estudios y convertirse en asistenta social, además, se pone a dieta para mejorar su imagen y crecer en autoestima. Su marido no ve con buenos ojos tanto cambio. Esta nueva situación coincide con la etapa convulsa de la adolescencia de Gretchen.

A lift-the-flap book showing milestones in a baby's development during pregnancy and the mother's experiences as it grows.

Climb aboard for a journey into the world of trains! In this fascinating, Spanish-translated nonfiction title, readers learn about the history of trains, the different uses for them, and the different types and parts including freight cars, box cars, passenger cars, and the caboose. With detailed photos, informative text, and intriguing facts, this book will have readers delighted from cover to cover!

Provides detailed instructions for experiments involving cells, the brain, the senses, breathing, circulation, and other areas of the human body.