Agujeros negros (Black Holes)

La amenaza del holocausto y su aventura. Detalles de Libro "Hacia El Sur" es una novela original de Juan B. Bergua que le envolverá en una aventura literaria incomparable con una trama centrada en la amenaza del holocausto. Juan B. Bergua nació en España en marzo de 1892. Obtuvo el título de Abogado a los 18 años gracias a su notable memoria, que también le hizo prodigio en el aprendizaje de idiomas. Interesado en conocer los clásicos de la literatura en su lengua de origen, aprendió varios idiomas, no sólo en su época de estudiante cuando aprendió Francés, Inglés, Alemán,...

If you look close enough, a butterfly can grow up right before your eyes. Through the use of accessible text, readers take an exciting look at the journey butterflies make. A picture glossary helps beginning readers strengthen their vocabulary skills, and vibrant, full-color photographs show caterpillars grow to adulthood, taking flight to travel around the world.

Readers may never expect that they might free fall to Earth, but if they have ever dived into a pool, that's exactly what they've done. This book shows readers how Newton's three laws of motion affect divers, skydivers, and mountain climbers' movements. Readers discover who uses gravity, and who works against it, and all other forces that contribute to a successful dive or climb. After reading this book, readers can decide if they will ever be interested in engaging in one of these extreme sports.

Read about the powerful rattlesnake and how its tail rattles to warn predators to stay away or risk a venomous bite. Amazing photos and simple text make this book a great high-interest read.