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.

    Authored by two pediatric nurses, this straightforward guide to feeding, bedtime routines, and medical issues includes an instructional DVD with step-by-step demonstrations of how to care for a newborn to a 6-month-old child.

    New 'Consolidation' sections and questions designed to provide a link between GCSE and A-level feature in the text.At the end of each section there are many questions - ideal for consolidation and revision - mainly from past A-level examination papers. Over 15 of these past-paper questions have been added in the Fourth Edition. Answers are included.

    The text provides a highly intuitive and practical understanding of the material by emphasizing the physics and the underlying physical phenomena involved. Using a reader-friendly approach and a conversational writing style, the book is self-instructive and entertains while it teaches. It shows that highly technical matter can be communicated effectively in a simple yet precise language.

    Learn how Ptolemy fixed his results to match his theories; how Freud used cocaine to expand his thinking; and how Tim Berners-Lee, inventor of the World Wide Web, was banned from using university computers after being caught hacking.Revealing how human curiosity knows no bounds, this book showcases the visionaries who have dared to question established 'truths' and whose theories shaped how we now look at the world.

    Clear, concise language sets the record straight on a diverse range of topics as Lawrence Potter presents answers to fifty-seven questions about the world we live in, stretching from "What is jihad?" to "is fair trade a good thing?" and "Is there still a war in Chechnya?" . Important information including the latest research on environmental issues and the history behind current events worldwide is presented in enough detail to be useful without overwhelming readers with too much making for a balanced, informed reference guide.Also covering... What is the problem with plastic bags? What did Sadaam do to the Kurds? What is the difference between a sunni and a shia and is it possible that global warming is not taking place in a thoroughly updated new edition complete with a new chapter explaining the problem of Afghanistan

    Belknap's Waterproof Grand Canyon River Guide (All New Color Edition)

    The emphasis is, instead, on the myriad ways in which the universe presents itself to us--and how, as observers and participants in its processes, we respond to it. "Life, like a dome of many-colored glass," wrote Percy Bysshe Shelley, "stains the white radiance of eternity." The author seeks here to explore the variety that gives life its beauty.Taken from Dyson's recent public lectures--delivered to audiences with no specialized knowledge in hard sciences--the book begins with a consideration of the practical and political questions surrounding biotechnology. As he seeks how best to explain the place of life in the universe, Dyson then moves from the ethical to the purely scientific. The book concludes with an attempt to understand the implications of biology for philosophy and religion.The pieces in this collection touch on numerous disciplines, from astronomy and ecology to neurology and theology, speaking to the lay reader as well as to the scientist. As always, Dyson's view of human nature and behavior is balanced, and his predictions of a world to come serve primarily as a means for thinking about the world as it is today.

    Although Australia’s prompt, science-led response to COVID-19 has not been perfect, it has saved tens of thousands of lives. But for decades, governments have ignored, ridiculed or understated the advice of scientists on the climate emergency.Now, in the wake of the megafires of 2020, a time of reckoning has arrived. In The Climate Cure renowned climate scientist Tim Flannery takes aim at those responsible for the campaign of obfuscation and denial that has already cost so many Australian lives and held back action on climate change.Flannery demands a new approach, based on the nation’s response to COVID-19, that will lead to effective government policies. The Climate Cure is an action plan for our future. We face a fork in the road, and must decide now between catastrophe and survival.

    The gear you select and how you use it can mean big results—or bigger disappointment.FASTER takes a scientific look at triathlon to see what truly makes you faster—and busts the myths and doublespeak that waste your money and race times. In this fascinating exploration of the forces at play in the swim-bike-run sport, astronautical engineer and triathlete Jim Gourley shows where to find free speed, speed on a budget, and the gear upgrades that are worth it.FASTER offers specific, science-based guidance on the fastest techniques and the most effective gear, answering questions like: •    Which wetsuit is best for me? •    What’s the best way to draft a swimmer? •    Should I buy a lighter bike? •    Deep dish or disc wheels? •    Are lighter shoes faster? •    Who’s right about running technique? Gourley reviews published studies in peer-reviewed journals to show what scientists have learned about swim drafting, pacing the bike leg, race strategy for short and long-course racing, and the fastest ways to handle transitions.FASTER will change how you think about your body, your gear, and the world around you. With science on your side, you'll make the smart calls that will make you a better, faster triathlete.

    Written by Susan McMurry, the Study Guide and Solutions Manual provide answers and explanations to all in-text and end-of-chapter exercises.

    At the same time as climate change has assumed this status, it has become a topic more likely to be included in a church sermon. Indeed, while once considered the concern of scientific institutions, climate change is now increasingly incorporated into faith-based initiatives with even Pope Francis weighing in, issuing an encyclical on the subject as explained in chapter 16 by Paul Driessen. There are those who believe Pope Francis, and admire another climate change exponent, Al Gore – who marketed An Inconvenient Truth with comment, ‘the fact of global warming is not in question’ and that ‘its consequences for the world we live in will be disastrous if left unchecked’. And then there are the die-hard sceptics who dare to doubt. Many claim that these climate sceptics and their support base have an undue political influence, successfully thwarting attempts to implement necessary public policy change. This book is a collection of chapters by so-called climate sceptics. Each writer was asked to write on an aspect of the topic in which they are considered to have some expertise. None of them deny that climate change is real, but instead, they point out how extremely complex the topic of Earth’s climate is, with some of the contributors also querying the, often generally accepted, solutions. As you will see, this is not a book with just one message, except perhaps that there is a need for more scrutiny of the data, and of our own prejudices. This book’s reason for being is to give pause for thought, and to throw some alternative ideas and considerations into the mix.

    . . these are great things. Every field should have a hare.’The hare, a night creature and country-dweller, is a rare sight for most people. We know them only from legends and stories. They are shape-shifters, witches’ familiars and symbols of fertility. They are arrogant, as in Aesop’s The Hare and the Tortoise, and absurd, as in Lewis Carroll’s Mad March Hare. In the absence of observed facts, speculation and fantasy have flourished. But real hares? What are they like?In The Private Life of the Hare, John Lewis-Stempel explores myths, history and the reality of the hare. And in vivid, elegant prose he celebrates how, in an age when television cameras have revealed so much in our landscape, the hare remains as elusive and magical as ever.

    Now, at a moment when mathematicians are finally moving in on a proof, Dartmouth professor Dan Rockmore tells the riveting history of the hunt for a solution.In 1859 German professor Bernhard Riemann postulated a law capable of describing with an amazing degree of accuracy the occurrence of the prime numbers. Rockmore takes us all the way from Euclid to the mysteries of quantum chaos to show how the Riemann hypothesis lies at the very heart of some of the most cutting-edge research going on today in physics and mathematics.

    This claim is not only false, but its presence in the debate is an insult to science." With these words, the authors begin a detailed analysis of one of the most controversial topics of the day. The authors make a compelling case against claims of a scientific consensus. The purported proof of such a consensus consists of sloppy research by nonscientists, college students, and a highly partisan Australian blogger. Surveys of climate scientists, even those heavily biased in favor of climate alarmism, find extensive disagreement on the underlying science and doubts about its reliability. The authors point to four reasons why scientists disagree about global warming: a conflict among scientists in different and often competing disciplines; fundamental scientific uncertainties concerning how the global climate responds to the human presence; failure of the United Nations Intergovernmental Panel on Climate Change (IPCC) to provide objective guidance to the complex science; and bias among researchers. The authors offer a succinct summary of the real science of climate change based on their previously published comprehensive review of climate science in a volume titled Climate Change Reconsidered II: Physical Science. They recommend that policymakers resist pressure from lobby groups to silence scientists who question the authority of the IPCC to claim to speak for climate science. More than 50,000 copies of the first edition were sold or given away in five months to elected officials, civic and business leaders, scientists, and other opinion leaders. The response from the science community and experts on climate change has been overwhelmingly positive. To meet demand for more copies, we have produced this second revised edition. Changes include a foreword by Marita Noon, at the time executive director of Energy Makes America Great, Inc. Some of the discussion in Chapter 1 has been revised and expanded thanks to feedback from readers of the first edition. Graphs in Chapters 4, 5, and 6 are now full color, and new graphs have been added.