Time travel is metaphysically possible. Nikk Effingham contends that arguments for the impossibility of time travel are not sound. Focusing mainly on the Grandfather Paradox, Effingham explores the ramifications of taking this view, discusses issues in probability and decision theory, and considers the potential dangers of travelling in time.

A Princeton astrophysicist explores whether journeying to the past or future is scientifically possible in this “intriguing” volume (Neil deGrasse Tyson). It was H. G. Wells who coined the term “time machine”—but the concept of time travel, both forward and backward, has always provoked fascination and yearning. It has mostly been dismissed as an impossibility in the world of physics; yet theories posited by Einstein, and advanced by scientists including Stephen Hawking and Kip Thorne, suggest that the phenomenon could actually occur. Building on these ideas, J. Richard Gott, a professor who has written on the subject for Scientific American, Time, and other publications, describes how travel to the future is not only possible but has already happened—and contemplates whether travel to the past is also conceivable. This look at the surprising facts behind the science fiction of time travel “deserves the attention of anyone wanting wider intellectual horizons” (Booklist). “Impressively clear language. Practical tips for chrononauts on their options for travel and the contingencies to prepare for make everything sound bizarrely plausible. Gott clearly enjoys his subject and his excitement and humor are contagious; this book is a delight to read.” —Publishers Weekly

He believes in science, but only magic can help his mom. Twelve-year-old Finn is used to people in his family disappearing. His twin sister, Faith, drowned when they were three years old. A few months ago, his mom abandoned him and his dad with no explanation. Finn clings to the concrete facts in his physics books—and to his best friend, Gabi—to ward off his sadness. But then his grandmother tells him a secret: the women in their family are Travelers, able to move back and forth in time. Finn's mom is trapped somewhere in the timeline, and she's left Finn a portal to find her. But to succeed, he'll have to put his trust in something bigger than logic. "This is an incredible book, no matter which time universe you're in. I couldn't put it down. One of my favorite debut novels of the year."—Erin Entrada Kelly, New York Times bestselling author and 2018 Newbery Medal winner

A time-travel story that is both a poignant exploration of human identity and an absorbing tale of suspense. It’s natural to feel a little out of place when you’re the new girl, but when Charlotte Makepeace wakes up after her first night at boarding school, she’s baffled: everyone thinks she’s a girl called Clare Mobley, and even more shockingly, it seems she has traveled forty years back in time to 1918. In the months to follow, Charlotte wakes alternately in her own time and in Clare’s. And instead of having only one new set of rules to learn, she also has to contend with the unprecedented strangeness of being an entirely new person in an era she knows nothing about. Her teachers think she’s slow, the other girls find her odd, and, as she spends more and more time in 1918, Charlotte starts to wonder if she remembers how to be Charlotte at all. If she doesn’t figure out some way to get back to the world she knows before the end of the term, she might never have another chance.

LEAP INTO THE FUTURE, AND SHOOT BACK TO THE PAST H. G. Wells’s seminal short story “The Time Machine,” published in 1895, provided the springboard for modern science fiction’s time travel explosion. Responding to their own fascination with the subject, the greatest visionary writers of the twentieth century penned some of their finest stories. Here are eighteen of the most exciting tales ever told, including “Time’s Arrow” In Arthur C. Clarke’s classic, two brilliant physicists finally crack the mystery of time travel—with appalling consequences. “Death Ship” Richard Matheson, author of Somewhere in Time, unveils a chilling scenario concerning three astronauts who stumble upon the conundrum of past and future. “Yesterday was Monday” If all the world’s a stage, Theodore Sturgeon’s compelling tale follows the odyssey of an ordinary joe who winds up backstage. “Rainbird” R.A. Lafferty reflects on what might have been in this brainteaser about an inventor so brilliant that he invents himself right out of existence. “Timetipping” What if everyone time-traveled except you? Jack Dann provides some surprising answers in this literary gem. . . . as well as stories by Poul Anderson • L. Sprague de Camp • Joe Haldeman • John Kessel • Nancy Kress • Henry Kuttner • Ursula K. Le Guin • Larry Niven • Charles Sheffield • Robert Silverberg • Connie Willis By turns frightening, puzzling, and fantastic, these stories engage us in situations that may one day break free of the bonds of fantasy . . . to enter the realm of the future: our future. Note: "A Sound of Thunder" by Ray Bradbury and "I'm Scared" by Jack Finney are not included in this edition.

This “stimulating contribution to literary theory” reveals the deeply philosophical concerns and developments behind popular time travel sci-fi (London Review of Books). In Time Travel, literary theorist David Wittenberg argues that time travel fiction is not mere escapism, but a narrative “laboratory” where theoretical questions about storytelling—and, by extension, about the philosophy of temporality, history, and subjectivity—are presented in story form. Drawing on physics, philosophy, narrative theory, psychoanalysis, and film theory, Wittenberg links innovations in time travel fiction to specific shifts in the popularization of science, from nineteenth-century evolutionary biology to twentieth-century quantum physics and more recent “multiverse” cosmologies. Wittenberg shows how popular awareness of new science led to surprising innovations in the literary “time machine,” which evolved from a vehicle used for sociopolitical commentary into a psychological device capable of exploring the temporal structure and significance of subjects, viewpoints, and historical events. Time Travel draws on classic works of science fiction by H. G. Wells, Edward Bellamy, Robert Heinlein, Samuel Delany, and Harlan Ellison, television shows such as “The Twilight Zone” and “Star Trek,” and other popular entertainments. These are read alongside theoretical work ranging from Einstein, Schrödinger, Stephen Hawking to Gérard Genette, David Lewis, and Gilles Deleuze. Wittenberg argues that even the most mainstream audiences of popular time travel fiction and cinema are vigorously engaged with many of the same questions about temporality, identity, and history that concern literary theorists, media and film scholars, and philosophers.

This is the dramatic and inspirational first-person story of theoretical physicist, Dr. Ronald Mallett, who recently discovered the basic equations for a working time machine that he believes can be used as a transport vehicle to the past. Combining elements of Rocket Boys and Elegant Universe, Time Traveler follows Mallett's discovery of Einstein's work on space-time, his study of Godel's work on a solution of Einstein's equation that might allow for time travel, and his own research in theoretical physics spanning thirty years that culminated in his recent discovery of the effects of circulating laser light and its application to time travel. The foundation for Mallett's historic time-travel work is Einstein's theory of general relativity, a sound platform for any physicist. Through his years of reading and studying Einstein, Mallett became a buff well before he had any notion of the importance of the grand old relativist's theories to his own career. One interesting subtext to the story is Mallett's identification with, and keen interest in, Einstein. Mallett provides easy-to-understand explanations of the famous physicist's seminal work.

Best Books of 2016 BOSTON GLOBE * THE ATLANTIC From the acclaimed bestselling author of The Information and Chaos comes this enthralling history of time travel—a concept that has preoccupied physicists and storytellers over the course of the last century. James Gleick delivers a mind-bending exploration of time travel—from its origins in literature and science to its influence on our understanding of time itself. Gleick vividly explores physics, technology, philosophy, and art as each relates to time travel and tells the story of the concept's cultural evolutions—from H.G. Wells to Doctor Who, from Proust to Woody Allen. He takes a close look at the porous boundary between science fiction and modern physics, and, finally, delves into what it all means in our own moment in time—the world of the instantaneous, with its all-consuming present and vanishing future.

With his unique knack for making cutting-edge theoretical science effortlessly accessible, world-renowned physicist Paul Davies now tackles an issue that has boggled minds for centuries: Is time travel possible? The answer, insists Davies, is definitely yes—once you iron out a few kinks in the space-time continuum. With tongue placed firmly in cheek, Davies explains the theoretical physics that make visiting the future and revisiting the past possible, then proceeds to lay out a four-stage process for assembling a time machine and making it work. Wildly inventive and theoretically sound, How to Build a Time Machine is creative science at its best—illuminating, entertaining, and thought provoking.

A clear, plain-English guide to this complex scientific theory String theory is the hottest topic in physics right now, with books on the subject (pro and con) flying out of the stores. String Theory For Dummies offers an accessible introduction to this highly mathematical "theory of everything," which posits ten or more dimensions in an attempt to explain the basic nature of matter and energy. Written for both students and people interested in science, this guide explains concepts, discusses the string theory's hypotheses and predictions, and presents the math in an approachable manner. It features in-depth examples and an easy-to-understand style so that readers can understand this controversial, cutting-edge theory.