Louis Pasteur

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

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

Solar Energy Is Explained. Included In This Book Is Where It Comes From, Who Uses It, And The Positive And Negative Benefits Of Using It. Correlated To Common Core, Texas TEKS, Virginia Sols, And Georgia Performance Standards.

This inspiring biographical series ties in with elementary history, science, and social studies curricula, providing teachers with a valuable interdisciplinary resource. With these books, young readers will discover historical figures who devoted their lives to making the world a better place, and changed the course of history. Text copyright 2004 Lectorum Publications, Inc.

Citizens of the United States have the freedom to choose who they vote for. Voters can choose from a number of candidates. Most people belong to a political party and they often choose to vote for the candidate belonging to their political party. However, sometimes people choose to vote for a person regardless of their political affiliation. This book explores how people choose a candidate to vote for and why that choice matters. Relevant images aid readers in making textual connections.

Toda conducta se produce siempre en función de un contexto y una actitud concretas. La actitud es el factor afectivo-emocional que modula la conducta y la transforma en la singular actuación de cada uno de nosotros ante una situación determinada. La conducta y la actitud, sumada a las actuaciones, hacen aflorar un rasgo fundamental del sujeto: su esencial inestabilidad, el hecho de estar en un proceso constante de construcción y deconstrucción con el que se adapta a cada contexto. Esta oscilación entre la versatilidad de la conducta humana y la necesidad de conquistarse una identidad...

Thomas Edison is considered by many to be one of the greatest inventors of all time. His creations changed the world, but there was more to his life than just his inventions. Readers of this engaging volume will learn all about the man behind the innovations. This fascinating biography introduces important subjects and encourages a further interest in history. Concise and accessible text paired with vibrant photographs is sure to captivate audiences of many ages and levels.

Año 449, el futuro del mundo pende de un hilo. El otrora poderoso Imperio romano yace vulnerable. El enorme ejército de los hunos se encuentra reunido a un tiro de piedra, al otro lado del Danubio, preparado para atacar. El general romano Cayo Flavio Aecio sabe que Atila está sediento de la sangre de sus antiguos captores y sueña con su destrucción. Pero no recibe la ayuda necesaria y la horda arrasa la débil frontera, masacrando todas las guarniciones que encuentra a su paso. Atila planea una estrategia que le llevará a las mismísimas puertas de Roma. Pero antes deberá valorar si el ...