Energía del viento

Follows the life and career of the French scientist who proved the existence of germs and their connection with diseases.

Defines levers, explains their functions, and suggests simple experiments to demonstrate how they work.

Defines screws, explains their functions, and suggests simple experiments to demonstrate how they work.

Esta obra es una antología que reúne catorce relatos con distintos protagonistas y situaciones y un tema común: la postración moral, la humillación, el acomodo a difíciles supervivencias, de gentes modestas para quienes la guerra civil española fue su herida central y su cicatriz decisiva. Los relatos van precedidos de un prólogo de Camilo José Cela, incorporado en la edición de 1977, y de un prólogo actual a cargo de José María Merino.

"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."

When election season starts, the race is on! But what do campaigns, candidates, polls, and the Electoral College have to do with voting for our nation's leaders? Using engaging, age-appropriate language and colorful photos, readers decipher the complex electoral process and learn how to get involved in the next election. Fully translated Spanish text.

Provides a basic introduction to caves, including geographical information and plant and animal life.