La resolución de problemas

Read about fall activities and learn about the cycle of seasons in this Spanish-language edition. Full-color photographs and a photo glossary make this a great introduction to nonfiction reading for children.

Ahora en español, la verdadera historia del juguete favorito de todos los niños en el verano, la Súper Pistola de Agua, y cómo fue inventado por accidente. Mientras trataba de crear un sistema de enfriamiento para refrigeradores, Lonnie Johnson inventó sin quererlo el mecanismo de este emblemático juguete. Cuando era niño le encantaban los cohetes, los robots, todo tipo de inventos y, sobre todo, la creatividad. Gracias a su pasión y persistencia por resolver problemas, llegó a ser ingeniero y a trabajar para la NASA. Pero dio el gran salto a la fama cuando inventó la Súper Pistola ...

California became a territory in the United States when the Treaty of Guadalupe Hidalgo was signed in 1848. That treaty ended the Mexican War. Several days before its signing, gold was discovered at Sutter’s Mill in what is now Sacramento. The non-Native population of the territory was less than one thousand in 1848, but the gold rush increased that number to one hundred thousand by the end of 1849. The gold rush not only made many people wealthy, it brought ecologic devastation while speeding up California’s statehood. This book richly explores this interesting history.

Manifest Destiny the name given in the 1840s to a belief that the coast-to-coast expansion of the United States was both inevitable and justified, regardless of the means. Standing in the way were not only the native populations, but also the descendants of Spanish settlers who had lived in the Southwest for centuries. The racist belief that white men rightfully should expand their institutions into the area brought the United States into conflict with Mexico. War was declared in 1846, and by the time the Treaty of Guadalupe Hidalgo was signed in 1848, ending the war, the US had gained...