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.

Los trucos de Nikki para triunfar patinando sobre el hielo. #1: Busca una motivación importante para patinar. #2: Haz equipo con tus mejores amigas, Chloe y Zoey . #3: Mantén alejada a la odiosa Mackenzie. #4: Asegúrate de que sabes patinar. A Nikki Maxwell no le sorprende descubrir que su amor platónico, Brandon, es voluntario en un refugio de animales local. Él es un chico dulce - ¡por supuesto que quiere ayudar a esos perritos adorables! Pero Brandon le cuenta que el albergue está en peligro de ser cerrado, y Nikki sabe que no puede dejar que eso suceda. Así que Nikki y sus amigas...

What keeps objects from floating out of your hand? What if your feet drifted away from the ground? What stops everything from floating into space? Gravity. As in his previous books, Redwoods, Coral Reefs, and Island, Jason Chin has taken a complex subject and made it brilliantly accessible to young readers in this unusual, innovative, and very beautiful book.

Como en el afamado cuento, Caperucita Roja y su abuela salen ilesas. Pero esta historia no termina bien... para el libro. Almas sensibles y amantes de los libros, ¡favor de abstenerse!

Which things move slowly? Read this book to find out about how and why things move slowly. Books in this series introduce children to simple forces. Each book uses simple, repetitive text to teach children basic vocabulary, and includes stunning photographs that show how different forces are at work in the world around us. In Slow, children learn about things that commonly move slowly, how pushes and pulls can make something move slowly, and how some things are slower than others.