El uso de instrumentos para entender nuestro mundo / Using Tools to Understand Our World

Madame Olenska anuncia a Zoe y a sus compañeras que podrán empezar a utilizar zapatillas de punta antes de lo previsto en el programa. Es como crecer demasiado rápido: da vértigo y asusta al mismo tiempo. Mientras Jonathan crea su primera coreografía y experimenta los primeros celos, Zoe se enfrenta a una duda importante: ¿tiene de verdad talento para la danza? Y si la respuesta es que no, ¿qué hará con su vida?

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.

Este libro ilustrado para niños describe el ciclo de vida de la mariposa monarca, desde que la oruga sale del huevecillo, antes de convertirse en una crisálida, hasta que se transforma en adulto.

The plot of The Empty Region takes the reader from the military camps of holy warriors in Pakistan, to the security corridors of the CIA and the FBI. It’s a fascinating puzzle inhabited by historical characters, including Osama bin Laden and George W. Bush, as well as officials aware of the tragedy´s secrets. Szichman leads us along the terminals where the air pirates of al-Qaida consummated their tragic ritual, makes us travel on the airplanes, turned into guided missiles, and recreates the 102 minutes when the burning towers of the World Trade Center became hell on earth. Although...