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FOR USE IN SCHOOLS AND LIBRARIES ONLY. The anniversary edition of a now-classic survey of the origin and nature of the universe features a new introduction by the author and a new chapter on the possibility of time travel and wormholes in space.

Anyone alive in the eighteenth century would have known that “the longitude problem” was the thorniest scientific dilemma of the day-and had been for centuries. Lacking the ability to measure their longitude, sailors throughout the great ages of exploration had been literally lost at sea as soon as they lost sight of land. Thousands of lives, and the increasing fortunes of nations, hung on a resolution. The scientific establishment of Europe-from Galileo to Sir Isaac Newton-had mapped the heavens in both hemispheres in its certain pursuit of a celestial answer. In stark contrast, one man, John Harrison, dared to imagine a mechanical solution-a clock that would keep precise time at sea, something no clock had ever been able to do on land. Longitude is the dramatic human story of an epic scientific quest, and of Harrison's forty-year obsession with building his perfect timekeeper, known today as the chronometer. Full of heroism and chicanery, it is also a fascinating brief history of astronomy, navigation, and clockmaking, and opens a new window on our world.

An essential tool for standardized tests, the Spectrum Math series offers grade-appropriate coverage of basic arithmetic and math skills. Each book features drill and skill practice in math fundamentals, as well as applications of mathematics in everyday settings.

• Standards-driven math instruction

• Chapter Pre-Tests, Chapter Tests, Mid-Book Tests and Final Tests

• Developmental exercises

• Activities that extend problem-solving and analytical abilities

• Assignment Record Sheet

• Record of Test Scores Sheet

• Answer Key

Exceptionally accessible and user-friendly, this introduction to precalculus features an abundance of interesting real-world applications that relate to readers' everyday lives. Filled with scenarios, examples, study tips, exercises, etc., it takes the intimidation out of learning precalculus, and gets readers up to speed quickly and painlessly. Prerequisites: Fundamental Concepts of Algebra. Equations, Inequalities, and Mathematical Models. Functions and Graphs. Polynomial and Rational Functions. Exponential and Logarithmic Functions. Trigonometric Functions. Analytic Trigonometry. Additional Topics in Trigonometry. Systems of Equations and Inequalities. Matrices and Determinants. Conic Sections. Sequences, Induction, and Probability. For anyone wanting a user-friendly introduction to precalculus.

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About the Author:

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Author:Richard G. Brown
Illustrator:0
Publisher:Houghton Mifflin Harcourt (HMH)
Published Date:01/01/2006
Format:Hardcover
ISBN:0395977223
#of pages:#N/A

Becoming a teen is an important milestone in every boy’s life. It’s even more important to get answers and advice to the most common health issues boys face from a trusted source. The American Medical Association Boy’s Guide to Becoming a Teen is filled with invaluable advice to get you ready for the changes you will experience during puberty. Learn about these important topics and more:

• Puberty and what kinds of physical and emotional changes you can expect—from your developing body to your feelings about girls
• The importance of eating the right foods and taking care of your body
• Pimples, acne, and how to properly care for your skin
• Your reproductive system—inside and out
• Thinking about relationships and dealing with new feelings

FOR USE IN SCHOOLS AND LIBRARIES ONLY. Chronicles the life and times of an elephant and her devoted companion and trainer, who journeyed from a small German circus town to international stardom in the Greatest Show on Earth to a tragic twenty-year separation.