El Circulo de las Calabazas

What is matter and where can it be found? Everything in the world is made of matter, whether it is a solid, a liquid, or a gas. Important ideas about matter such as volume, mass, and how matter changes state are conveyed through a series of easy-to-do experiments.

Presents information about super jumbo jets, looking at the history and development of jets, discussing various aspects of design and construction, and exploring different types of jets, including the Concorde and the Airbus A380.

Cuando Paula, una niña inquieta y curiosa, conoce al Guardián del Tiempo no se imagina la gran aventura que la espera. Ambos viajan cuatro mil quinientos años hacia el pasado y la pequeña se sumergirá de lleno en la época del Neolítico. ¿Qué singulares aventuras le esperan a la intrépida protagonista? Una historia de amistad, valentía y superación de dificultades.

Based on the premise that all young people should learn to make decisions, respect themselves, and resolve challenging problems, this book is a self-help guide for adolescents to develop positive thinking, high self-esteem, and personal power. Exercises guide readers through learning about their own feelings, dreams, and needs while stressing that they are responsible for their own behavior and happiness. Situational anecdotes used to enhance the discussion are age-appropriate and relevant to children. Writing and keeping a journal are encouraged, and group exercises make the book useful in...