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.

A thoughtful discussion of violence in schools, complete with examples of incidents and suggestions for coping.

An innovative tool supports high school students and teachers in the area of language and communication. PP.

Una colección de libros para dejar de ser un bebé. La fantasía nos ayuda a crecer, y con el pato del pipí, la oveja de los sueños, el elefante de los mocos y el pájaro de la comida, los más pequeños aprenderán a utilizar el orinal para hacer pipí, la almohada para dormir, el pañuelo para sonarse y la cuchara para comer.

"Simple text and color photographs introduce kinds of motion, including motion powered by wind, water, and electricity--in both English and Spanish"--