Sexo para adolescentes

Before there was the U.S. Constitution, there were the Articles of Confederation. Readers discover the story behind the first written constitution of the United States—from the factors that inspired its creation to the reasons why it was replaced. The detailed main text is enhanced by informative sidebars and graphic organizers. Historical images, including relevant primary sources, allow readers to immerse themselves in this historical period. Readers are given the chance to thoroughly examine elements of the original document, making them feel like true historians. They’re sure to enjoy ...

Why do some things heat up quickly while others don't? How can heat cause matter to change form from solid to liquid to gas and back again? Heat cannot be seen, but it can easily be felt. Looking at different objects' molecular makeup, this book describes the fundamentals of heat and furthers understanding through a series of easy experiments.

Desiderio Vaquerizo Gil (Herrera del Duque, Badajoz; 1959) es Catedrático de la Universidad de Córdoba, donde ejerce como Profesor de Arqueología desde hace más de 20 años. Ha dirigido numerosos proyectos de investigación, y actualmente encabeza el más ambicioso de ellos, centrado en la ciudad de Córdoba entendida como yacimiento único, que sostiene un amplísimo equipo de investigadores dirigidos por él, y que está situando a la ciudad a la cabeza de los estudios sobre arqueología clásica en España, con repercusiones importantes en toda Europa. Ha publicado numerosas...

In this bilingual picture book, astronaut José M. Hernández recounts his childhood as the son of Mexican migrant workers and his life-long dream to travel to the stars.