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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.

For ages, the idea of machines that think and act on their own has gripped scientists, thinkers, and the general public. This book explores the history of artificial intelligence (A.I.), and how science fiction is quickly becoming science fact. It examines the technologies involved in A.I. and its inevitable effects on work, life, health, and many other aspects of human society. Rooted in history and science, this book provides an inside look at a topic that captivates engineers, scientists, and dreamers, but also raises important ethical issues and challenges how we see ourselves and our...

Based on the premise that all young people should learn to make decisions, respect themselves, and resolve challenging problems, this book is a self-help guide for adolescents to develop positive thinking, high self-esteem, and personal power. Exercises guide readers through learning about their own feelings, dreams, and needs while stressing that they are responsible for their own behavior and happiness. Situational anecdotes used to enhance the discussion are age-appropriate and relevant to children. Writing and keeping a journal are encouraged, and group exercises make the book useful in...

Narración fantástica que cuenta que Lucía es muy desdichada porque no se gusta nada. Las hadas deciden ayudarla y le mandan a Roberta, un hada de gran corazón que compone canciones, pero algo novata y despistada en sus hechizos. A partir de ese día, Roberta acompaña a Lucía al colegio, al zoo, a la biblioteca..., y en todas partes pone en apuros a la niña con sus hechizos mal acertados. Al final, después de tantas aventuras, el hada Roberta consigue su propósito: Lucía descubre, feliz, su gran belleza, porque ella es única e irrepetible, como todos y cada uno de nosotros.

Wind Power: A waving flag, blowing leaves, a kite soaring through the skyall are moved by wind power. Wind is also our fast-growing source of energy. Find out how wind forms and the different ways we may use it in the future.