On a forgotten island at the center of the earth, twelve-year-old Cal Cobble lives at an orphanage evading a bully, avoiding all thought of the nearby prison, and dreaming of finding his father, until he meets the mysterious Mr. E and everything changes.

On a forgotten island at the center of the earth, twelve-year-old Cal Cobble lives at an orphanage evading a bully, avoiding all thought of the nearby prison, and dreaming of finding his father, until he meets the mysterious Mr. E and everything changes.

What would you do if you turned on the faucet one day and nothing happened? What if you learned the water in your home was harmful to drink? Water is essential for life on this planet, but not every community has the safe, clean water it needs. In When the World Runs Dry, award-winning science writer Nancy Castaldo takes readers from Flint, Michigan, and Newark, New Jersey, to Iran and Cape Town, South Africa, to explore the various ways in which water around the world is in danger, why we must act now, and why you’re never too young to make a difference. Topics include: Lead and water infrastructure problems, pollution, fracking contamination, harmful algal blooms, water supply issues, rising sea levels, and potential solutions.

This book is about spaceborne missions and instruments. In addition, surveys of airborne missions and of campaigns can be found on the accompanying CD-ROM in pdf-format. Compared with the 3rd edition the spaceborne part grew from about 300 to 1000 pages. The complete text - including the electronic-only chapters - contains more than 1900 pages. New chapters treat the history of Earth observation and university missions. The number of commercial Earth imaging missions has grown significantly. A chapter contains reference data and definitions. Extensive appendices provide a comprehensive glossary, acronyms and abbreviations and an index of sensors. An effort has been made to present the information in context, to point out relationships and interconnections. The book may serve as a reference and guide to all involved in the various national and international space programs: researchers and managers, service providers and data users, teachers and students.

Accompanied by Torin of the Fire Folk, Rebecca Bloom returns to Earth to be reunited with her family and to continue the planetary healing process begun on Thianely. Her newfound abilities affect not only family members, but everyone else she encounters, including the many Thianelians living on Earth incognito. With the aid of her companions, Rebecca battles the sinister forces that intend to disrupt the balance between worlds.

Drip—Drop—Splash! Water is essential to all forms of life. Explore Water! 25 Great Projects, Activities, Experiments, captures a child’s imagination with an intriguing look at the world of water. Combining hands-on activities with history and science, kids will have fun learning about the water cycle, water resources, drinking water and sanitation, water pollution and conservation, water use, water folklore and festivals, and the latest in water technology. Entertaining illustrations and fascinating sidebars illuminate the topic and bring it to life, while Words to Know highlighted and defined within the text reinforce new vocabulary. Projects include a nilometer, a rain harvester made out of plastic containers, a transpiration experiment, and a mini water wheel. Auxiliary materials include a glossary, and a list of current reference works, websites, museums, and science centers.

More frisbees are sold each year than baseballs, basketballs and footballs combined. Yet these familiar flying objects have subtle and clever aerodynamic and gyrodynamic properties which are only recently being documented by wind tunnel and other studies. In common with other rotating bodies discussed in this readily accessible book, they are typically not treated in textbooks of aeronautics and the literature is scattered in a variety of places. This book develops the theme of disc-wings and spinning aerospace vehicles in parallel. Since many of the examples are recreational, anyone who enjoys these activities will likely find it profitable and enjoyable. In addition to spinning objects of various shapes, several exotic manned aircraft with disc planforms have been proposed and a prototypes built – these include a Nazi ‘secret weapon’ and the De Havilland Avrocar, also discussed in the book. Boomerangs represent another category of spinning aerodynamic body whose behavior can only be understood by coupling aerodynamics with gyrodynamics. The narrative, supported by equations and graphs, explains how the shape and throw of a boomerang relates to its trajectory. The natural world presents still other examples, namely the samaras or ‘seed-wings’ of many tree species, which autorotate during their descent, like a helicopter whose engine has failed. The flight performance of these spinning wings directly affects the dispersal and thus the evolutionary competitiveness of the trees concerned. Samara-type configurations are also considered for instrumentation and other payload dispersal applications. In short, the book discusses a range of familiar, connected, but largely undeveloped, topics in an accessible, but complete, manner. From the reviews of the first edition: "In his fascinating book Spinning Flight, Ralph Lorenz provides a rich feast of ... examples of spinning bodies ... . The book is well organized ... . The discussion in the book ... should be accessible to readers with some elementary understanding of aerodynamic principles. For the expert, the book is full of open problems ... . Its scope is extensive ... . In this respect, there may be something for everyone within its attractively designed cover ... ." (H. K. Moffatt, Nature, Vol. 444, December, 2006) "If you liked physics at school, then this book is for you. It concerns itself with flying objects that spin through the air, and even tells you how to impress your friends with the biomechanics of Frisbees. ... there is plenty of information at all levels, and the book has a wealth of detail that only an aerospace engineer like Lorenz could have come up with." (Len Fisher, BBC Focus, February, 2007)