Although the laws of physics create a powerful impression that time is flowing, in fact there are only timeless `nows'. In The End of Time, the British theoretical physicist Julian Barbour describes the coming revolution in our understanding of the world: a quantum theory of the universe that brings together Einstein's general theory of relativity - which denies the existence of a unique time - and quantum mechanics - which demands one. Barbour believes that only the most radical of ideas can resolve the conflict between these two theories: that there is, quite literally, no time at all. The End of Time is the first full-length account of the crisis in our understanding that has enveloped quantum cosmology. Unifying thinking that has never been brought together before in a book for the general reader, Barbour reveals the true architecture of the universe and demonstrates how physics is coming up sharp against the extraordinary possibility that the sense of time passing emerges from a universe that is timeless. The heart of the book is the author's lucid description of how a world of stillness can appear to be teeming with motion: in this timeless world where all possible instants coexist, complex mathematical rules of quantum mechanics bind together a special selection of these instants in a coherent order that consciousness perceives as the flow of time. Finally, in a lucid and eloquent epilogue, the author speculates on the philosophical implications of his theory: Does free will exist? Is time travel possible? How did the universe begin? Where is heaven? Does the denial of time make life meaningless? Written with exceptional clarity and elegance, this profound and original work presents a dazzlingly powerful argument that all will be able to follow, but no-one with an interest in the workings of the universe will be able to ignore.

    Deep down, a human brain is a chaotic seething soup of particles, on a higher level it is a jungle of neurons, and on a yet higher level it is a network of abstractions that we call "symbols." The most central and complex symbol in your brain or mine is the one we both call "I." The "I" is the nexus in our brain where the levels feed back into each other and flip causality upside down, with symbols seeming to have free will and to have gained the paradoxical ability to push particles around, rather than the reverse. For each human being, this "I" seems to be the realest thing in the world. But how can such a mysterious abstraction be real--or is our "I" merely a convenient fiction? Does an "I" exert genuine power over the particles in our brain, or is it helplessly pushed around by the all-powerful laws of physics? These are the mysteries tackled in I Am a Strange Loop, Douglas R. Hofstadter's first book-length journey into philosophy since Godel, Escher, Bach. Compulsively readable and endlessly thought-provoking, this is the book Hofstadter's many readers have long been waiting for.

    Even after more than three centuries and the revolutions of Einsteinian relativity and quantum mechanics, Newtonian physics continues to account for many of the phenomena of the observed world, and Newtonian celestial dynamics is used to determine the orbits of our space vehicles.This completely new translation, the first in 270 years, is based on the third (1726) edition, the final revised version approved by Newton; it includes extracts from the earlier editions, corrects errors found in earlier versions, and replaces archaic English with contemporary prose and up-to-date mathematical forms. Newton's principles describe acceleration, deceleration, and inertial movement; fluid dynamics; and the motions of the earth, moon, planets, and comets. A great work in itself, the Principia also revolutionized the methods of scientific investigation. It set forth the fundamental three laws of motion and the law of universal gravity, the physical principles that account for the Copernican system of the world as emended by Kepler, thus effectively ending controversy concerning the Copernican planetary system.The illuminating Guide to the Principia by I. Bernard Cohen, along with his and Anne Whitman's translation, will make this preeminent work truly accessible for today's scientists, scholars, and students.

    It’s a counterculture fusion of politics and pop, and it’s taking over a high school near you. Like the waves that came before it, it’s got passion, music, and anti-authority posturing, but more than anything else, this one has God. So what does it mean when today’s youth counterculture has a mindset more akin to Jerry Falwell’s than Abbie Hoffman’s? In RIGHTEOUS: Dispatches from the Evangelical Youth Movement, Lauren Sandler, a dynamic young journalist, reports from this junction of Evangelicalism and youth culture, traveling across the country to investigate the alternative Christian explosion. Using the grassroots modus operandi of the 1960s, these religious kids – part of the “Disciple Generation” as Sandler calls it – turn an antiauthoritarian sneer toward liberalism, feminism, pacifism, and every other hallmark of that era’s counterculture. And they’re engaging their peers with startling success, fusing pop culture, politics, and religion as they preach from the pulpit of the skate park, bar, and rock concert. Secular, liberal, and practically the embodiment of everything Evangelicalism deems unholy, Sandler travels with skateboard missionaries, hangs out with the tattooed members of a postpunk Seattle megachurch that has evolved into a self-sufficient community, camps out with a rock’n’roll antiabortion group, and gets to know the rap preachers who are merging hip-hop’s love of money with old-fashioned bible-beating fundamentalism. Much more than a mere observer, she connects with these young people on an intimate level, and the candor with which they reveal themselves to her is truly astonishing. Illuminating, often troubling, and unapologetically frank, RIGHTEOUS introduces a bold new voice into the ongoing debate over religion in American life. And it is the first in-depth front-line exploration of the country’s new moral majority – dressed up in punk-rock garb – and what its influence could mean for the future of America. BACKCOVER: Advanced Praise: “Lauren Sandler obliterates the naïve and complacent hope that keeps most secularists and religious moderates sleeping peacefully each night-the hope that, in 21st century America, the young know better than to adopt the lunatic religious certainties of a prior age. The young do not know better. In their schools, skate-parks, rock concerts, and in the ranks of our nation’s military, our children are gleefully preparing a bright future of ignorance and religious fascism for us all. If you have any doubt that there is a culture war that must be waged and won by secularists in America, read this book.” —Sam Harris, author of The End of Faith and Letter to a Christian Nation “It is no easy thing to enter into the world of the young evangelicals, to feel deeply their alienation, to breathe their air and share their electric conviction that they are the rising counterculture against an empty world. Lauren Sandler has done it, and done it with an effervescence and honesty that make her travels in Disciple America jump off the page.” —Todd Gitlin, Professor of Journalism and Sociology, Columbia University, and author of The Intellectuals and the Flag "At once controversial, critical, blasphemous and compassionate, Righteous offers a compelling journey into a growing youth subculture typically dismissed by urban intellectuals. Sandler has written a provocative and illuminating portrait of young people desperately seeking meaning, community and love in an empty, often terrifying social landscape. Evangelical youth---the Disciple Generation--- are a generation rising, and we do need to pay attention.” —Dr. Donna Gaines, sociologist and author of Teenage Wasteland: Suburbia's Dead End Kids and A Misfit's Manifesto: The Spiritual Journey of a Rock & Roll Heart “Lauren Sandler has traveled among the believers and returned with a story that alarms, informs, and enlightens. She reveals the rise of a fundamentalist-style youth movement that has replaced faith with closed-minded certainty and is frighteningly cult-like. Read this book and you will understand this Disciple Generation and the challenge it poses to a civil society.” —Michael D'Antonio, former Newsday religion writer and author of Fall From Grace and Heaven on Earth “Righteous is a lively, probing account of today's fresh, sometimes bizarre sub- cultures of American evangelism. Both the term ‘alternative’ and ‘evangelical’ will mean something new to you after this book. Sandler's conclusions are important: These kids have been forgotten by their original social worlds, by secular organizations and even by Left-Liberal causes. In a cold new world, getting saved can now seem like a young American's only source of community and warmth.” —Alissa Quart, author of Hothouse Kids: The Dilemma of the Gifted Child “Righteous is the most adroit and fascinating examination of a great national ill, the muddling of faith and politics, the secular and the divine.” —Brad Land, author of Goat

    Even when knowing this, however, most people send nothing, and almost all of the rest send little. What is themoral status of this behavior? To such common cases of letting die, our untutored response is that, while it is not very good, neither is the conduct wrong. What is the source of this lenient assessment? In this contentious new book, one of our leading philosophers argues that our intuitions aboutethical cases are generated not by basic moral values, but by certain distracting psychological dispositions that all too often prevent us from reacting in accord with our commitments. Through a detailed look at how these tendencies operate, Unger shows that, on the good morality that we alreadyaccept, the fatally unhelpful behavior is monstrously wrong. By uncovering the eminently sensible ethics that we've already embraced fully, and by confronting us with empirical facts and with easily followed instructions for lessening serious suffering appropriately and effectively, Unger's bookpoints the way to a compassionate new moral philosophy.

    The sense in which the natural sciences are exemplary for inquiry is explicated in terms of the moral virtues of scientific communities rather than in terms of a special scientific method. The volume concludes with reflections on the relation of social democratic politics to philosophy.

    The material is arranged chronologically beginning with archaic origins and covers Egyptian, Mesopotamian, Greek, Chinese, Indian, Arabic and European contributions done to the nineteenth century and present day. There are revised references and bibliographies and revised and expanded chapters on the nineteeth and twentieth centuries.

    In late 2017, scientists at a Hawaiian observatory glimpsed an object soaring through our inner solar system, moving so quickly that it could only have come from another star. Avi Loeb, Harvard’s top astronomer, showed it was not an asteroid; it was moving too fast along a strange orbit, and left no trail of gas or debris in its wake. There was only one conceivable explanation: the object was a piece of advanced technology created by a distant alien civilization.   In Extraterrestrial, Loeb takes readers inside the thrilling story of the first interstellar visitor to be spotted in our solar system. He outlines his controversial theory and its profound implications: for science, for religion, and for the future of our species and our planet. A mind-bending journey through the furthest reaches of science, space-time, and the human imagination, Extraterrestrial challenges readers to aim for the stars—and to think critically about what’s out there, no matter how strange it seems.

    Is there some way to determine if you are getting enough sleep? Do dogs and cats dream? What are the ways to help children sleep through the night? What role did sleep deficit play in the loss of the space shuttle Challenger and the nuclear accidents at Chernobyl and Three Mile Island? Why is the shift to Daylight Savings Time dangerous? Why do many sleeping medications actually make insomnia worse? What was Leonardo da Vinci’s technique for getting by with only an hour and a half of sleep each day? The answers to these questions are in this fascinating and provocative book that will change the way you think about sleep.

    It has been developed specifically for emerging courses in astrobiology, though it can also be used for introductory astronomy.

    We have Mindstorms to thank for that. In this book, pioneering computer scientist Seymour Papert uses the invention of LOGO, the first child-friendly programming language, to make the case for the value of teaching children with computers. Papert argues that children are more than capable of mastering computers, and that teaching computational processes like de-bugging in the classroom can change the way we learn everything else. He also shows that schools saturated with technology can actually improve socialization and interaction among students and between students and teachers.

    As we enter the year 2000, zero is once again making its presence felt. Nothing itself, it makes possible a myriad of calculations. Indeed, without zero mathematicsas we know it would not exist. And without mathematics our understanding of the universe would be vastly impoverished. But where did this nothing, this hollow circle, come from? Who created it? And what, exactly, does it mean? Robert Kaplan's The Nothing That Is: A Natural History of Zero begins as a mystery story, taking us back to Sumerian times, and then to Greece and India, piecing together the way the idea of a symbol for nothing evolved. Kaplan shows us just how handicapped our ancestors were in trying to figurelarge sums without the aid of the zero. (Try multiplying CLXIV by XXIV). Remarkably, even the Greeks, mathematically brilliant as they were, didn't have a zero--or did they? We follow the trail to the East where, a millennium or two ago, Indian mathematicians took another crucial step. By treatingzero for the first time like any other number, instead of a unique symbol, they allowed huge new leaps forward in computation, and also in our understanding of how mathematics itself works. In the Middle Ages, this mathematical knowledge swept across western Europe via Arab traders. At first it was called dangerous Saracen magic and considered the Devil's work, but it wasn't long before merchants and bankers saw how handy this magic was, and used it to develop tools likedouble-entry bookkeeping. Zero quickly became an essential part of increasingly sophisticated equations, and with the invention of calculus, one could say it was a linchpin of the scientific revolution. And now even deeper layers of this thing that is nothing are coming to light: our computers speakonly in zeros and ones, and modern mathematics shows that zero alone can be made to generate everything.Robert Kaplan serves up all this history with immense zest and humor; his writing is full of anecdotes and asides, and quotations from Shakespeare to Wallace Stevens extend the book's context far beyond the scope of scientific specialists. For Kaplan, the history of zero is a lens for looking notonly into the evolution of mathematics but into very nature of human thought. He points out how the history of mathematics is a process of recursive abstraction: how once a symbol is created to represent an idea, that symbol itself gives rise to new operations that in turn lead to new ideas. Thebeauty of mathematics is that even though we invent it, we seem to be discovering something that already exists.The joy of that discovery shines from Kaplan's pages, as he ranges from Archimedes to Einstein, making fascinating connections between mathematical insights from every age and culture. A tour de force of science history, The Nothing That Is takes us through the hollow circle that leads to infinity.

    The authors of these books—Richard Dawkins, Daniel Dennett, Sam Harris, Christopher Hitchens, and Victor J. Stenger—have come to be known as the "New Atheists." Predictably, their works have been controversial and attracted a good deal of critical reaction. In this new book, Victor J. Stenger, whose God: The Failed Hypothesis was on the New York Times bestseller list in 2007, reviews and expands upon the principles of New Atheism and answers many of its critics. He demonstrates in detail that naturalism—the view that all of reality is reducible to matter and nothing else—is sufficient to explain everything we observe in the universe, from the most distant galaxies to the inner workings of the brain that result in the phenomenon of mind. Stenger disputes the claim of many critics that the question of whether God exists is beyond the ken of science. On the contrary, he argues that absence of evidence for God is, indeed, evidence of absence when the evidence should be there and is not. Turning from scientific to historical evidence, Stenger then points out the many examples of evil perpetrated in the name of religion. He also notes that the Bible, which is still taken to be divine revelation by millions, fails as a basis for morality and is unable to account for the problem of unnecessary suffering throughout the world. Finally, he discusses the teachings of ancient nontheist sages such as Buddha, Lao Tzu, and Confucius, whose guidelines for coping with the problems of life and death did not depend upon a supernatural metaphysics. Stenger argues that this "way of nature" is far superior to the traditional supernatural monotheisms, which history shows can lead to a host of evils. The New Atheism is a well-argued defense of the atheist position and a strong rebuttal of its critics.

    More than two centuries after Euler's death, it is still regarded as a conceptual diamond of unsurpassed beauty. Called Euler's identity or God's equation, it includes just five numbers but represents an astonishing revelation of hidden connections. It ties together everything from basic arithmetic to compound interest, the circumference of a circle, trigonometry, calculus, and even infinity. In David Stipp's hands, Euler's identity formula becomes a contemplative stroll through the glories of mathematics. The result is an ode to this magical field.

    It defines our experience of the world; it echoes through our every waking hour. Time is the very foundation of conscious experience. Yet as familiar as it is, time is also deeply mysterious. We cannot see, hear, smell, taste, or touch it. Yet we do "feel" it--or at least we "think" we feel it. No wonder poets, writers, philosophers, and scientists have grappled with time for centuries.In his latest book, award-winning science writer Dan Falk chronicles the story of how humans have come to understand time over the millennia, and by drawing from the latest research in physics, psychology, and other fields, Falk shows how that understanding continues to evolve. "In Search of Time" begins with our earliest ancestors' perception of time and the discoveries that led--with much effort--to the Gregorian calendar, atomic clocks, and "leap seconds." Falk examines the workings of memory, the brain's remarkable "bridge across time," and asks whether humans are unique in their ability to recall the past and imagine the future. He explores the possibility of time travel, and the paradoxes it seems to entail. Falk looks at the quest to comprehend the beginning of time and how time--and the universe--may end. Finally, he examines the puzzle of time's "flow," and the remarkable possibility that the passage of time may be an illusion.Entertaining, illuminating, and ultimately thought provoking, "In Search of Time "reveals what some of our most insightful thinkers have had to say about time, from Aristotle to Kant, from Newton to Einstein, and continuing with the brightest minds of today.