Cómo podemos utilizar la palanca?

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

The Uses Of Wind Energy Is The Topic Of This Book. Explains The Positive And Negative Impact This Form Of Energy Can Have On Our World.

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

Miss Esperanza Alice Gorst creció en París al cuidado de una amiga de su madre, Madame de L’Orme, puesto que sus progenitores fallecieron cuando ella no era más que una niña. Esperanza creció feliz al amparo de los cuidados de Madame y la formación que le proveía su tutor, Mr.Thornahaugh.Cuando ambos le comunican que debe asumir la responsabilidad de llevar a cabo una importante misión, a Esperanza no le queda más remedio que aceptar y viaja a Evenwood, Inglaterra, con el cometido de hacerse con la vacante de sirvienta de Lady Tansor, pero sin ningún conocimiento de su objetivo...

History is full of unsolved crimes, mysterious disappearances, and strange sightings. Readers will discover some of the most well-known mysteries in history--including Amelia Earhart, Big Foot, and the Salem Witch Trials--in this fascinating, Spanish-translated nonfiction book. Featuring detailed images, intriguing facts, and informational text in conjunction with a glossary of terms and an index, readers will be enthralled from beginning to end!

For many years, people believed there were nine planets that orbited the sun. Now we say there are eight. What happened to the ninth planet, Pluto? What are the different planets like? What exactly makes a planet a planet? These are the many intriguing questions answered with this high-interest book, crafted to be accessible for readers of all levels. Young astronomers will be especially fascinated by the stunning photographs and the "Make the Grade" fact boxes.

This is a story of three characters--Noah, Joyce, and the anonymous narrator--as each leave their far-flung birthplaces to follow their own personal songs of migration. All three end up in Montreal, each on his or her voyage of selfdiscovery, each compelled to deal with the mishaps of heartbreak and the twisted branches of their shared family tree. Filled with humor, charm, and marvelous storytelling, this novel links cartography, garbage-obsessed archeologists, pirates past and present, a mysterious book with no cover, and a broken compass whose needle obstinately points to the Aleutian...