10 cosas que puedes hacer para ahorrar electricidad

Viaja por el espacio con la ayuda de este espectacular libro que contiene: un Sistema Solar en tres dimensiones; mapas del espacio que muestran dónde está cada planeta, con muchos datos sobre cada uno de ellos; páginas deslizables y mucha información sobre cada planeta del Sistema Solar, la Luna, el Sol, la Vía Láctea y el universo...

History is full of unsolved crimes, mysterious disappearances, and strange sightings. Readers will discover some of the most well-known mysteries in history--including Amelia Earhart, Big Foot, and the Salem Witch Trials--in this fascinating, Spanish-translated nonfiction book. Featuring detailed images, intriguing facts, and informational text in conjunction with a glossary of terms and an index, readers will be enthralled from beginning to end!

Biographical And Science-Related Information, Examining The Life Of Louis Daguerre And His Invention Of Photography.

This book is a comprehensive, practical presentation of the principles of behavior modification and guidelines for their application. It teaches forms of behavior modification ranging from helping children learn necessary life skills to training pets, to solving personal behavior problems.