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For the general public, magnetism often seems more the province of new age quacks, movie mad scientists, and grade-school teachers than an area of actual, ongoing scientific inquiry. But as Ronald T. Merrill reveals in Our Magnetic Earth, geomagnetism really is an enduring, vibrant area of science, one that offers answers to some of the biggest questions about our planet’s past—and maybe even its future. In a clear and careful fashion, he lays out the physics of geomagnetism and magnetic fields, then goes on to explain how Earth’s magnetic field provides crucial evidence for our understanding of continental drift and plate tectonics; how and why animals, ranging from bacteria to mammals, sense and use the magnetic field; how changes in climate over eons can be studied through variations in the magnetic field in rocks; and much more. Throughout, Merrill peppers his scientific account with bizarre anecdotes and fascinating details, from levitating pizzas to Moon missions to blackmailing KGB agents—a reminder that real science can at times be stranger, and more amusing, than fiction. A winning primer for anyone who has ever struggled with a compass or admired a ragged V of migrating geese, Our Magnetic Earth demonstrates that education and entertainment need not be polar opposites.
Principles and Applications of Biostatistics covers the primary concepts and methods that are required for a fundamental understanding of the use and interpretation of statistics for the biological and health sciences–from data presentation to multiple regression and analysis of variance. With a focus clarity, brevity, and accuracy, this text provides understandable and focused explanation of statistical principles and applications along with practical examples (provided in R and Microsoft Excel) and problems drawn from biological health and medical settings. Key Features: • Practical questions follow each problem to encourage students to consider why the problem likely exists, help formulate hypotheses, and then statistically assess those hypotheses. • Abundant assignment problems at the end of sections and each chapter cover a variety of application areas of biostatistics. • Rationale boxes offer explanations of why certain methods are used for specific cases.
The Earth's Magnetic Field : Its History, Origin, and Planetary Perspective
Designed for quick reference in the clinical environment, Merrill's Pocket Guide to Radiography is a pocket-sized companion to Merrill's Atlas of Radiographic Positioning and Procedures, 12th Edition. This handy resource summarizes essential information for 170 of the most frequently requested projections you'll encounter. Authors Eugene Frank, Barbara Smith, and Bruce Long concisely present just the information you'll need for quick reference -- keep it with you and keep Merrill's close at hand! Diagnostic-quality radiographs demonstrate desired imaging results. Key positioning information is formatted for quick and easy access. Each procedure is presented in a two-color, two-page spread with bulleted, step-by-step procedures and accompanying images on the top page; and a chart with spaces to fill in the specific techniques used for a particular projection on the bottom page. Section dividers with tabs offer quick access to each section. Computed radiography information allows you to make the subtle adjustments necessary to obtain optimal results with CR. Exposure technique chart for every projection helps reduce the number of repeat radiographs and improves overall image quality. Abbreviations and external landmark charts on the inside covers provide quick access to frequently needed information. kVp values are included for each projection. Compensating filter information included for those projections where filters are used. New exposure index column for use with digital imaging systems Specific collimation settings for all projections done using DR Systems