Booker T. Washington

Introducing chemical and biological concepts, this book explains what occurs in the body when a person plays, trains, or participates in an athletic event and allows the reader to understand that sports are not only a question of muscles, but of lungs, bones, chemical reactions, intelligence, and, naturally, a lot of heart.

Describes where fossil fuels come from, their uses and forms, the harm they cause to the environment, and sources of renewable energy.

El joven Temujin se ha convertido en Gengis Khan, el victorioso comandante que conseguirá unir a las tribus más belicosas de las estepas. Su intención es forjar una nueva nación en las salvajes llanuras y montañas de Mongolia, un nacimiento sangriento que pondrá a un continente de rodillas. Durante miles de años, las tribus han sido mantenidas a raya por las fortalezas del imperio de los Chin, una tierra de enorme riqueza e ingentes ejércitos imbatibles. A cambio, los guerreros de Gengis sólo poseen el arco, el caballo y una disciplina de hierro nacida de una tierra de hielo, hambre...

With every new feat, there is at least one big failure. Learn about some of the biggest technological feats and failures in human history in this fascinating, Spanish-translated nonfiction title that allows readers to discover some of the technological innovations that have made life easier. Featuring detailed images, charts, and graphs, informational text, and intriguing facts, children will be engaged and captivated from cover to cover!