Cómo podemos utilizar la palanca?

Esta excelente biografía del célebre químico francés está dirigida especialmente a los lectores jóvenes y presenta los logros más significativos de este importante científico. Él realizó investigaciones decisivas sobre la fermentación y las bacterias, sostuvo que los gérmenes eran los responsables de las infecciones y desarrolló el proceso de la pasteurización, de enorme importancia para la economía y la salud pública. Además, descubrió las vacunas contra el ántrax y la rabia. También fue el primer director del Instituto Pasteur, fundado en 1888 para investigar los virus y ...

Follows the Thirteen the Amendment that freed the slaves, end of the war, and the death of President Abraham Lincoln.

Follows The Thirteenth Amendment That Freed The Slaves, The End Of The War, And The Death Of President Abraham Lincoln.

“Dino” Don Lessem brings readers face-to-face with various dinosaur species, detailing their habitats, way of life and how they became extinct. An acclaimed dinosaur expert, Don Lessem has written more than 30 children’s books, writes a popular dinosaur column in Highlights magazine, and was an adviser for Jurassic Park. Take a trip through dinosaur time to meet these small dinosaurs face-to-face: Little Lesothosaurus was the length of a house cat! Epidendrosaurus could climb into trees like a squirrel! Liaoceratops had body armor and horns-and was only the size of a collie dog! Plus,...

Teach children that being honest in words and actions builds trust and self-confidence, and that telling the truth can take courage and tact in this English-Spanish bilingual book. It’s never too soon to learn the difference between what’s true and what isn’t. In this English-Spanish bilingual book, words and pictures help young children discover that being honest in words and actions builds trust and self-confidence. They also learn that telling the truth sometimes takes courage and tact. Includes discussion questions, skits, scenarios, and games that reinforce the ideas being taught,...

Este libro infantil para pintar incluye más de 100 animales de la granja para colorear. Niños de todas las edades encontrarán imágenes divertidas y fáciles de colorear, cada una en una hoja nueva, para que sea más fácil poder compartir sus habilidades artísticas con amigos y familiares. Las imágenes para colorear incluyen caballos, corderos, conejos, potros, gallinas, becerros, patos, vacas, cerditos y muchos otros animales de la granja. Estas imágenes fascinantes mantendrán a los niños atraídos durante horas y estimularán su creatividad, mejorando el desarrollo visual-espacial...

The United States grew rapidly from the time of the Louisiana Purchase to the building of the Transcontinental Railroad. All of this expansion came at the expense of Native American populations that had either lived in the region for centuries or been forced there from ancestral homes in the East. Tribes memorably fought on their own and together in an doomed effort to retain the land and a lifestyle that had long sustained their families. This book outlines some of the major conflicts of the Westward Expansion, and of the treaties and were signed, and often broken, by representatives of the...