Ondas sonoras y la comunicación (Sound Waves and Communication)

The need for speed is the motivating factor in this engaging, Spanish book. Readers learn the history of travel from the very slow to the supersonic and beyond, including everything in between. They learn and discover the factors that influence motion for all types of vehicles: land, air, and water alike. They also learn different ways to measure speed and read about energy uses for different vehicles. With greater speed comes greater risk. Readers learn how engineers are always seeking new and better ways to keep people safe as they travel faster and go farther.

La lucha por la supervivencia, el amor y la traición impregnan las páginas de esta intensa y cautivadora novela ambientada en la Suecia de 1940 que ya es considerada en Escandinavia como el Casablanca sueco. En Suecia, durante el duro invierno de 1940, Georg es reclutado para defender la frontera con Finlandia contra el avance del Ejército Rojo. Mal equipados, desnutridos y expuestos a temperaturas extremas, los soldados están a merced de oficiales sádicos e incompetentes. Tras un motín, Georg y otros soldados rebeldes son enviados a un campo de trabajo. Mientras tanto, Kerstin, la...

Advise yourself! Jump into Pigeon English and experience the jubilant, infectious voice of Harrison Opoku--a boy awed by the city, obsessed with gummy candy, a friend to everyone he meets. See why he is bo-styles. How being the fastest runner in Year 7 makes him dope-fine. And how crazy things get when Harri and his best friend launch their own investigation into the murder of a classmate and one of the Dell Farm Crew's hutious criminals feels them closing in on him. You'll want this book to last donkey hours, and you'll see why Harri is truly a "hero for our times." Like Room . . . and The...

El flamenco no ha gozado históricamente de un interés sistemático como objeto de estudio e investigación. Conviene pues recordar que es un verdadero sistema musical, un género artístico con una historia documental;