Cruzar un continente

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.

Make patterns fun at recess time! This exciting title has been translated into Spanish and helps young readers recognize repeating patterns all around through helpful charts and familiar images of recess time. Children will better understand early STEM themes through the help of simple, applicable examples of patterns. This title will engage young readers with games and featured "You Try It!" problems!

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. This primary source book explores California’s unique geography: the coastal region, the Central Valley, the mountain region, and the desert region. 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...

What has a scruffy tail, soft fur with dark spots, and a short, spiky mane? If you guessed a spotted hyena, you're right! This book introduces early readers to a mystery animal by describing its features, one by one, using short simple sentences and eye-popping full-color photos. At the end of the book, the secret animal is revealed across a colorful, two-page spread. Young children will love showing off their beginning reading skills as they learn about this dazzling collection of wild and wonderful zoo animals--one clue at a time! Fast facts and habitat maps at the end of the book provide...

El 11 de febrero de 1990, después de haber luchado toda su vida contra el Apartheid y tras 27 años en prisión, Nelson Mandela fue finalmente liberado. La historia de Mandela, que finalmente se ha convertido en uno de los más grandes líderes mundiales, es también la difícil historia de Sudáfrica.

Venerado y vilipendiado a un tiempo, Lobachevski se cierne imponente sobre la matemática del siglo XIX. Al igual que sucede a la mayoría de los mitos, el Lobachevski real está oculto por capas de negligencia y desconocimiento. Su fantástica obra, argumentaban muchos, no era otra cosa que herejía matemática, una senda falsa. Lobachevski es una personalidad abrumadora, un soñador empedernido, un hacedor de mundos imposibles pero reales. Lobachevski es, para muchos, una persona desconocida. Este libro cuenta la historia de un hombre sencillo, pero sagaz, obstinado y profundo desde el...

Entre rimas jocosas y lecciones cantarinas este libro ofrecerá a sus lectores un recorrido por la historia de México. Con cañonazos y toda la cosa se narran brevemente los acontecimientos de la Independencia nacional