El ferrocarril transcontinental (The Transcontinental Railroad)

"While preparing for Christmas in Puerto Rico, seven-year-old Esmeralda asks the Three Magi for a baby doll like her cousin's, but when they bring something else instead she gains a deeper understanding of the meaning of the holiday."

Maps of the different regions of the world show their geographic, cultural, and economic features. Includes text describing the individual coutries.

Explains the basic science of flight, the problems of getting vehicles into the air, different types of engines, and aircraft design, and includes instructions for making aircraft models.

A STEM-focused addition to the #1 New York Times bestselling She Persisted series! Now available in Spanish! A lo largo de la historia, a las mujeres les han dicho que la ciencia no es para ellas porque no son suficientemente inteligentes, o porque sus cerebros simplemente no son capaces de ese tipo de estudio. En este libro, Chelsea Clinton nos presenta a varias mujeres científicas que no prestaron atención a los que les dijeron que no y optaron por utilizar su ingenio, sus habilidades y su persistencia para descubrir, inventar, crear y explicar. Ella persistió en la ciencia es un libro...