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.

Explore outer space and learn about stars, galaxies, planets, asteroids and how these bodies are all related to one another. Featured in this book are photographs from outer space and related vocabulary.

Un recorrido por emociones y trastornos como la ansiedad, la depresión, la impotencia, el duelo... monstruos que viven con nosotros y con los que tenemos aprender a luchar o a convivir. Hay monstruos que viven con nosotros y con los que tenemos aprender a luchar o a convivir. Oscuro como mi corazón es abrir una ventana a otras vidas. A otras vidas y también a la nuestra: es un viaje a emociones y situaciones límite que podrían sucedernos a cualquiera de nosotros o que tal vez ya hayamos vivido. Porque hay monstruos que viven en nosotros y a menudo la única salida, nuestro único camino...

Pets! We love them, and we take good care of them. Learn all about what Guinea Pigs need to be happy and playful pets. ¡Las mascotas! Las amamos y las cuidamos mucho. Aprende todo sobre qué necesitan los Cobayos para estar felices y ser mascotas juguetonas.

"Dino" Don Lessem brings readers face-to-face with various dinosaur species, detailing their habitats, way of life and how they became extinct. An acclaimed dinosaur expert, Don Lessem has written more than 30 children's books, writes a popular dinosaur column in Highlights magazine, and was an adviser for Jurassic Park. Take a trip through dinosaur time to meet these sea giants face-to-face: The Archelon was similar to a turtle, but its shell was made of crossed rib bone covered in rubbery skin! The Mososaurs had huge pointy jaws and grew to be fifty feet long! The Ichthyosaurs looked a lot...