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Until just over 150 years ago, northern Mexico extended thousands of kilometers farther than its current border with the United States. Many different indigenous groups flourished in that region before the Conquistadors arrived. What we know about their lives and customs is the result of archeological discoveries and the chronicles of the first Spanish priests and soldiers that had contact with them.

Examines the life and work of the British physicist who overcame the challenges of ALS to become one of the foremost scientists of the twentieth century.

Un proyecto enfocado al aprendizaje en la etapa de Secundaria basado en los contenidos curriculares y en la práctica en el aula, todo ello adaptado a las necesidades y aptitudes de cada curso. El libro del alumno ofrece un gran número de actividades teóricas, prácticas, competenciales e interactivas que pretenden contribuir al desarrollo de las competencias básicas. Se presta una especial atención a las nuevas tecnologías a través de vídeos, actividades interactivas y animaciones con el fin de adentrar a los alumnos en la sociedad de la información y facilitar, al tiempo, la gran...

It doesn't take a lot to conserve electricity. Taking action can be as simple as turning off the lights when you leave a room or using "people power" instead of cars to get around. Kids learn this and more about what they can do to help in 10 Things I Can Do to Save Electricity. Now in Spanish.