G. Wells' 1895 classic The Time Machine, readers of science fiction have puzzled over the paradoxes of time travel. What would happen if a time traveler tried to change history? Would some force or law of nature prevent him? Or would his action produce a "new" history, branching away from the original?In the last decade of the twentieth century a group of theoretical physicists at the California Institute of Technology undertook a serious investigation of the possibility of pastward time travel, inspiring a serious and sustained study that engaged more than thirty physicists working at universities and institutes around the world.Many of the figures involved are familiar: Einstein, Stephen Hawking and Kip Thorne; others are names known mostly to physicists. These are the new time travelers, and this is the story of their work--a profoundly human endeavor marked by advances, retreats, and no small share of surprises. It is a fantastic journey to the frontiers of physics.

    In this thrill-ride across millennia and continents, the complete history of the planet comes to life: from the Earth's fiery birth to its near-obliteration in the Triassic period, and from the first signs of human life to the tentative future of a world with a burgeoning population and a global warming crisis. Covering a wide range of topics including astrophysics, zoology, and sociology, and complete with maps and illustrations, What on Earth Happened? In Brief is the endlessly entertaining story of the planet, life, and people.

    For the calculus-based General Physics course primarily taken by engineers and scientists.

    Provides a review of introductory noncalculus-based physics for those who do not have a strong background in mathematics.

    Contains 3000 solved problems with solutions, solved problems; an index to help you quickly locate the types of problems you want to solve; problems like those you'll find on your exams; techniques for choosing the correct approach to problems; and guidance toward efficient solutions.

    Concisely and with a rare clarity, he demystifies how we are uncovering the inner workings of the universe and heading towards the next scientific revolution.Why are atoms so small? How did the Higgs boson save the universe? And is there a Theory of Everything? The Particle Zoo answers these and many other profound questions, and explains the big ideas of Quantum Physics, String Theory, The Big Bang and Dark Matter... and, ultimately, what we know about the true, fundamental nature of reality.

    It examines general patterns of human behavior in age-graded periods, sources of diversity in life course trajectories, and unique life stories. It is multidimensional in scope and current in theory and research. This completely revised second edition maintains the use of case studies to help students appreciate the diversity of life course trajectories, and all chapters have been updated to reflect social trends and new developments in theory and research. To reflect the trend toward finer gradations in life phases, this edition addresses nine age-graded periods instead of the six presented in the first edition: Conception, Pregnancy, and Birth; Infancy and Toddlerhood; Early Childhood; Middle Childhood; Adolescence; Young Adulthood; Middle Adulthood; Late Adulthood; and Very Late Adulthood. The Changing Life Course is the companion volume to Person and Environment (ISBN 0-7619-8765-7). The two volumes are also available as a Two-Volume Kit (ISBN 0-7619-8803-3). An Instructor′s Manual containing chapter summaries, suggested classroom activities and discussions, and essay and multiple choice questions is also available (ISBN: 0-7619-8804-1).

    A BOOK OF PHYSICS.

    Now in its fourth edition, the work has been extensively revised, with entirely new artwork, updated examples and new pedagogical features. An interactive CD-ROM with worked examples is included. Alternatively, the material on from the CD-ROM can be down-loaded from a website (see supplements section). Twentieth-century developments such as quantum mechanics are introduced early on, so that students can appreciate their importance and see how they fit into the bigger picture.

    But what if, nonetheless, Einstein got it wrong?Since the 1930s, physicists have noticed an alarming discrepancy between the universe as we see it and the universe that Einstein's theory of relativity predicts. There just doesn't seem to be enough stuff out there for everything to hang together. Galaxies spin so fast that, based on the amount of visible matter in them, they ought to be flung to pieces, the same way a spinning yo-yo can break its string. Cosmologists tried to solve the problem by positing dark matter—a mysterious, invisible substance that surrounds galaxies, holding the visible matter in place—and particle physicists, attempting to identify the nature of the stuff, have undertaken a slew of experiments to detect it. So far, none have.Now, John W. Moffat, a physicist at the Perimeter Institute for Theoretical Physics in Waterloo, Canada, offers a different solution to the problem. The cap­stone to a storybook career—one that began with a correspondence with Einstein and a conversation with Niels Bohr—Moffat's modified gravity theory, or MOG, can model the movements of the universe without recourse to dark matter, and his work chal­lenging the constancy of the speed of light raises a stark challenge to the usual models of the first half-million years of the universe's existence.This bold new work, presenting the entirety of Moffat's hypothesis to a general readership for the first time, promises to overturn everything we thought we knew about the origins and evolution of the universe.

    Damage to a Russian aircraft carrier leads to a breakdown in the detente with the United States. Star wars erupt as the two countries invoke space-based weapons in a deadly face off in orbit. Robert Issacs, Deputy Director of Scientific Intelligence for the CIA, and his top aide, Dr. Patricia Danielson, connect the carrier damage with a mysterious seismic signal. Thwarted by internal CIA politics, they put their careers at risk to engage in an unauthorized consultation with Jason, the secret group of physicists who consult for the government. Astrophysicist Alex Runyan advances a fantastic theory that triggers a race for the truth before the conflict with Russia can spin out of control. The quest leads to the New Mexico laboratory of Paul Krone. The true danger dwarfs that posed by the international crisis. Bonus links to historical background material are provided at the end of the book. The Krone saga continues in the sequel, Krone Ascending, also available for Kindle.

    Written for the engineer as well as the race car enthusiast, the authors, who developed many of the original vehicle dynamics theories and principles covered in this book, including the Moment Method, pair analysis and lap time simulation, include much information that is not available in any other vehicle dynamics text.

    An exceptional book written by a true professional.

    In this unconventional introduction, physicist Leonard Susskind and hacker-scientist George Hrabovsky offer a first course in physics and associated math for the ardent amateur. Unlike most popular physics books—which give readers a taste of what physicists know but shy away from equations or math—Susskind and Hrabovsky actually teach the skills you need to do physics, beginning with classical mechanics, yourself. Based on Susskind's enormously popular Stanford University-based (and YouTube-featured) continuing-education course, the authors cover the minimum—the theoretical minimum of the title—that readers need to master to study more advanced topics.An alternative to the conventional go-to-college method, The Theoretical Minimum provides a tool kit for amateur scientists to learn physics at their own pace.