Conservación de la masa (Conservation of Mass)

Light can travel faster than anything else in the universe. But what exactly is light, and where does it come from? This nonfiction Spanish book teaches students all about light, and introduces them to important scientific concepts and vocabulary terms like infrared, ultraviolet, photos, and visible spectrum. The intriguing images, detailed diagrams, and stimulating sidebars will keep students connected to the text. The fun lab activity provides a real-world learning experience that supports STEM instruction. Aligned to state and national standards, the leveled text supports differentiation....

Este libro nos descubre otra historia de los Kennedy, muy distinta a la desenfadada y frívola que se suele contar. La historia de dos hombres, el presidente y su hermano Robert, que mantuvieron una dura lucha contra las fuerzas oscuras de su entorno: contra los generales y los dirigentes del aparato de inteligencia, empeñados en arrastrar al país a una nueva guerra mundial. Una lucha que acabó con el asesinato de John en Dallas, que Robert estaba convencido que era obra de una conspiración del crimen organizado, la CIA y los grupos que planeaban una acción violenta contra Cuba, lo que...

En esta crónica de la Segunda República, José María Gironella relata la vida de una familia de clase media, los Alvear, y a partir de aquí va profundizando en todos los aspectos de la vida ciudadana y de las diversas capas sociales. El lector asiste a lo largo de la obra al proceso en virtud del cual España fue dividiéndose en dos bandos irreconciliables hasta desembocar en la guerra civil.

Though few may know his name, his achievement as the first European to discover San Diego Bay and many other areas on the California coast enshrines his name in the annals of American history. This exciting volume tells Cabrillo's story from an unknown soldier to the intrepid conquistador, crossbowman, landowner, shipbuilder, and explorer he became. As one of Hernan Cortes' soldiers during the conquest of Mexico and a founder of Guatemala, his actions loomed large in the future of both South America and North America. By both educating and entertaining, this biography illuminates a...

Learn about the rich history of Mission Santa Bárbara: how it started, the people who ran it, the indigenous population, and its legacy today.