El círculo

Black holes are neither holes nor black. They're invisible and packed with matter! Future astronomers will find out many more fascinating facts about these space phenomena with this intriguing book. Carefully crafted text encapsulates the most important information about black holes, such as how scientists locate them and their significance in a star's life cycle. Amazing photographs support critical concepts and inspire a true appreciation of the spectacles of space.

For thousands of years, militaries around the world were limited to male soldiers. However, throughout history, brave women have stepped out of the background and onto the battlefield. This biographical text covers the important women who’ve broken ground in the military. Famous historical figures such as Joan of Arc, Clara Barton, and Florence Nightingale are covered in depth, while the stories of modern-day heroes are presented to show how women are still affecting change on the front lines. A comprehensive timeline, fact boxes, and historical and modern images complete this...

La 'Gramática de la Lengua Española' es el resultado de más de diez años de trabajo del catedrático y académico Emilio Alarcos Llorach. Ha sido redactada buscando el equilibrio entre la claridad y el rigor de la exposición, y concebida con una intención normativa y didáctica, por lo que constituye algo más que un mero tratado teórico de la materia. En ella se exponen los rasgos de la gramática del español en los actos orales y escritos de los usuarios de la lengua en este siglo XX, descritos según un hilo conductor consecuente y con una orientación metodológica funcionalista.

How do you truly engage students in learning history? When students make personal connections to the subject, they’re much more motivated to learn. This Spanish book provides firsthand accounts of history that give personal insights into historical events. Students will learn about the U.S. Constitution, the Articles of Confederation, the Connecticut Compromise, and the Bill of Rights. With a visually appealing layout, this book features captivating text, fun facts, sidebars, and time lines that help students grasp the essential concepts they need to know at their grade level. Packed with...