Omar Jayyam

La historia de la ciencia en la Edad Media es, hasta el siglo X, la del mantenimiento precario de los escasos saberes de la Antigüedad clásica que habían sobrevivido en occidente. A partir de entonces, la traducción del árabe de las obras de autores griegos fue la tarea fundamental. En el siglo XIII aparecen los primeros matemáticos medievales realmente creadores - Fibonacci, Jordano Nemorario y Nicolás de Oresme, entre otros. Al estudio de la obra de estos científicos y la de sus precursores está dedicado este libro.

Imagine traveling at half the speed of a jet plane without ever leaving the ground! Students will discover the technology that makes such speeds possible, from special tracks and safety precautions to aerodynamically designed trains. What are the limits to the speed of trains? What imposes those limits? Students also will read about the future of passenger train travel, from flying trains to trains that use huge magnets to levitate inches or centimeters off the track. Some trains safely reach speeds of more than 200 mph!

La inexplicable desaparición del gentleman Atticus Craftsman en el corazón de las tinieblas de la España profunda parece estar relacionada con las malas artes de cinco mujeres desesperadas, las empleadas de la revista Librarte, capaces de cualquier cosa con tal de conservar su trabajo.

Each year, Martin Luther King Jr. Day serves as a reminder of the life and work of one of America's greatest civil rights activists. In this informative book, readers will learn about the importance of the civil rights movement and why we celebrate Martin Luther King Jr. Day. Full-color photographs accompany the text. This essential book features accessible language that is ideal for children in the early stages of learning to read.

Take a trip to the world market for an exciting way to learn about standard measurement! This title, that has been translated into Spanish, takes young readers to markets around the world, showing them how to measure common food items with standard measurements. Some things are measured by length! Some things are measured by weight! Children will learn these and other measurement techniques through vibrant images, fun examples, and simple mathematical charts, enhancing their mathematical and STEM skills. This 6-Pack includes six copies of this title and a lesson plan.