Energía del viento

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

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

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

The man who saved the lives of his PT-109 crewmen during WWII and became the 35th president fought-and won-his first battle at the age of two-and-a-half, when he was stricken with scarlet fever. Although his presidency was cut short, our nation¿s youngest elected leader left an indelible mark on the American consciousness and now is profiled in our Who Was¿? series. Included are 100 black-and-white illustrations as well as a timeline that guides readers through this eventful period in history.

"Simple text and photographs describe common things that are blue, including blueberries, bluebirds, and blue jeans"--Provided by publisher.

Children learn many things about the octopus, such as where they live, what they eat, and what they do to survive.

Esta serie fue especialmente diseñada para ayudar a los alumnos de primaria a ejercitar la letra script y cursiva de manera sencilla, al remarcar y copiar trazos, letras, palabras y enunciados. En cada sección se trabaja con tres símbolos o letras, tanto en letra script como en cursiva. De esta manera se mejoran al mismo tiempo la escritura y la ortografía. Los textos incluidos buscan aportar también información interesante sobre lugares, cosas y personajes, así como ideas para lograr una mejor convivencia con los demás y para cuidar el medio ambiente. This series was specially...