Author: Stephen Hawking
Publisher: Bantam
ISBN: 055380202X
Category : Science
Languages : en
Pages : 228
Book Description
Stephen Hawking’s phenomenal, multimillion-copy bestseller, A Brief History of Time, introduced the ideas of this brilliant theoretical physicist to readers all over the world. Now, in a major publishing event, Hawking returns with a lavishly illustrated sequel that unravels the mysteries of the major breakthroughs that have occurred in the years since the release of his acclaimed first book. The Universe in a Nutshell • Quantum mechanics • M-theory • General relativity • 11-dimensional supergravity • 10-dimensional membranes • Superstrings • P-branes • Black holes One of the most influential thinkers of our time, Stephen Hawking is an intellectual icon, known not only for the adventurousness of his ideas but for the clarity and wit with which he expresses them. In this new book Hawking takes us to the cutting edge of theoretical physics, where truth is often stranger than fiction, to explain in laymen’s terms the principles that control our universe. Like many in the community of theoretical physicists, Professor Hawking is seeking to uncover the grail of science — the elusive Theory of Everything that lies at the heart of the cosmos. In his accessible and often playful style, he guides us on his search to uncover the secrets of the universe — from supergravity to supersymmetry, from quantum theory to M-theory, from holography to duality. He takes us to the wild frontiers of science, where superstring theory and p-branes may hold the final clue to the puzzle. And he lets us behind the scenes of one of his most exciting intellectual adventures as he seeks “to combine Einstein’s General Theory of Relativity and Richard Feynman’s idea of multiple histories into one complete unified theory that will describe everything that happens in the universe.” With characteristic exuberance, Professor Hawking invites us to be fellow travelers on this extraordinary voyage through space-time. Copious four-color illustrations help clarify this journey into a surreal wonderland where particles, sheets, and strings move in eleven dimensions; where black holes evaporate and disappear, taking their secret with them; and where the original cosmic seed from which our own universe sprang was a tiny nut. The Universe in a Nutshell is essential reading for all of us who want to understand the universe in which we live. Like its companion volume, A Brief History of Time, it conveys the excitement felt within the scientific community as the secrets of the cosmos reveal themselves.
The Universe in a Nutshell
Author: Stephen Hawking
Publisher: Bantam
ISBN: 055380202X
Category : Science
Languages : en
Pages : 228
Book Description
Stephen Hawking’s phenomenal, multimillion-copy bestseller, A Brief History of Time, introduced the ideas of this brilliant theoretical physicist to readers all over the world. Now, in a major publishing event, Hawking returns with a lavishly illustrated sequel that unravels the mysteries of the major breakthroughs that have occurred in the years since the release of his acclaimed first book. The Universe in a Nutshell • Quantum mechanics • M-theory • General relativity • 11-dimensional supergravity • 10-dimensional membranes • Superstrings • P-branes • Black holes One of the most influential thinkers of our time, Stephen Hawking is an intellectual icon, known not only for the adventurousness of his ideas but for the clarity and wit with which he expresses them. In this new book Hawking takes us to the cutting edge of theoretical physics, where truth is often stranger than fiction, to explain in laymen’s terms the principles that control our universe. Like many in the community of theoretical physicists, Professor Hawking is seeking to uncover the grail of science — the elusive Theory of Everything that lies at the heart of the cosmos. In his accessible and often playful style, he guides us on his search to uncover the secrets of the universe — from supergravity to supersymmetry, from quantum theory to M-theory, from holography to duality. He takes us to the wild frontiers of science, where superstring theory and p-branes may hold the final clue to the puzzle. And he lets us behind the scenes of one of his most exciting intellectual adventures as he seeks “to combine Einstein’s General Theory of Relativity and Richard Feynman’s idea of multiple histories into one complete unified theory that will describe everything that happens in the universe.” With characteristic exuberance, Professor Hawking invites us to be fellow travelers on this extraordinary voyage through space-time. Copious four-color illustrations help clarify this journey into a surreal wonderland where particles, sheets, and strings move in eleven dimensions; where black holes evaporate and disappear, taking their secret with them; and where the original cosmic seed from which our own universe sprang was a tiny nut. The Universe in a Nutshell is essential reading for all of us who want to understand the universe in which we live. Like its companion volume, A Brief History of Time, it conveys the excitement felt within the scientific community as the secrets of the cosmos reveal themselves.
Publisher: Bantam
ISBN: 055380202X
Category : Science
Languages : en
Pages : 228
Book Description
Stephen Hawking’s phenomenal, multimillion-copy bestseller, A Brief History of Time, introduced the ideas of this brilliant theoretical physicist to readers all over the world. Now, in a major publishing event, Hawking returns with a lavishly illustrated sequel that unravels the mysteries of the major breakthroughs that have occurred in the years since the release of his acclaimed first book. The Universe in a Nutshell • Quantum mechanics • M-theory • General relativity • 11-dimensional supergravity • 10-dimensional membranes • Superstrings • P-branes • Black holes One of the most influential thinkers of our time, Stephen Hawking is an intellectual icon, known not only for the adventurousness of his ideas but for the clarity and wit with which he expresses them. In this new book Hawking takes us to the cutting edge of theoretical physics, where truth is often stranger than fiction, to explain in laymen’s terms the principles that control our universe. Like many in the community of theoretical physicists, Professor Hawking is seeking to uncover the grail of science — the elusive Theory of Everything that lies at the heart of the cosmos. In his accessible and often playful style, he guides us on his search to uncover the secrets of the universe — from supergravity to supersymmetry, from quantum theory to M-theory, from holography to duality. He takes us to the wild frontiers of science, where superstring theory and p-branes may hold the final clue to the puzzle. And he lets us behind the scenes of one of his most exciting intellectual adventures as he seeks “to combine Einstein’s General Theory of Relativity and Richard Feynman’s idea of multiple histories into one complete unified theory that will describe everything that happens in the universe.” With characteristic exuberance, Professor Hawking invites us to be fellow travelers on this extraordinary voyage through space-time. Copious four-color illustrations help clarify this journey into a surreal wonderland where particles, sheets, and strings move in eleven dimensions; where black holes evaporate and disappear, taking their secret with them; and where the original cosmic seed from which our own universe sprang was a tiny nut. The Universe in a Nutshell is essential reading for all of us who want to understand the universe in which we live. Like its companion volume, A Brief History of Time, it conveys the excitement felt within the scientific community as the secrets of the cosmos reveal themselves.
A Briefer History of Time
Author: Stephen Hawking
Publisher: Bantam
ISBN: 0553385461
Category : Science
Languages : en
Pages : 176
Book Description
#1 NEW YORK TIMES BESTSELLING AUTHORS The science classic made more accessible • More concise • Illustrated FROM ONE OF THE MOST BRILLIANT MINDS OF OUR TIME COMES A BOOK THAT CLARIFIES HIS MOST IMPORTANT IDEAS Stephen Hawking’s worldwide bestseller A Brief History of Time remains a landmark volume in scientific writing. But for years readers have asked for a more accessible formulation of its key concepts—the nature of space and time, the role of God in creation, and the history and future of the universe. A Briefer History of Time is Professor Hawking’s response. Although “briefer,” this book is much more than a mere explanation of Hawking’s earlier work. A Briefer History of Time both clarifies and expands on the great subjects of the original, and records the latest developments in the field—from string theory to the search for a unified theory of all the forces of physics. Thirty-seven full-color illustrations enhance the text and make A Briefer History of Time an exhilarating and must-have addition in its own right to the great literature of science and ideas.
Publisher: Bantam
ISBN: 0553385461
Category : Science
Languages : en
Pages : 176
Book Description
#1 NEW YORK TIMES BESTSELLING AUTHORS The science classic made more accessible • More concise • Illustrated FROM ONE OF THE MOST BRILLIANT MINDS OF OUR TIME COMES A BOOK THAT CLARIFIES HIS MOST IMPORTANT IDEAS Stephen Hawking’s worldwide bestseller A Brief History of Time remains a landmark volume in scientific writing. But for years readers have asked for a more accessible formulation of its key concepts—the nature of space and time, the role of God in creation, and the history and future of the universe. A Briefer History of Time is Professor Hawking’s response. Although “briefer,” this book is much more than a mere explanation of Hawking’s earlier work. A Briefer History of Time both clarifies and expands on the great subjects of the original, and records the latest developments in the field—from string theory to the search for a unified theory of all the forces of physics. Thirty-seven full-color illustrations enhance the text and make A Briefer History of Time an exhilarating and must-have addition in its own right to the great literature of science and ideas.
The Illustrated A Brief History of Time
Author: Stephen W. Hawking
Publisher:
ISBN: 9780593060933
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN: 9780593060933
Category :
Languages : en
Pages :
Book Description
To Paradise
Author: Hanya Yanagihara
Publisher: Anchor
ISBN: 0385547943
Category : Fiction
Languages : en
Pages : 720
Book Description
#1 NEW YORK TIMES BEST SELLER • From the award-winning, best-selling author of the classic A Little Life—a bold, brilliant novel spanning three centuries and three different versions of the American experiment, about lovers, family, loss and the elusive promise of utopia. A BEST BOOK OF THE YEAR: VOGUE • ESQUIRE • NPR • GOODREADS To Paradise is a fin de siècle novel of marvelous literary effect, but above all it is a work of emotional genius. The great power of this remarkable novel is driven by Yanagihara’s understanding of the aching desire to protect those we love—partners, lovers, children, friends, family, and even our fellow citizens—and the pain that ensues when we cannot. In an alternate version of 1893 America, New York is part of the Free States, where people may live and love whomever they please (or so it seems). The fragile young scion of a distinguished family resists betrothal to a worthy suitor, drawn to a charming music teacher of no means. In a 1993 Manhattan besieged by the AIDS epidemic, a young Hawaiian man lives with his much older, wealthier partner, hiding his troubled childhood and the fate of his father. And in 2093, in a world riven by plagues and governed by totalitarian rule, a powerful scientist’s damaged granddaughter tries to navigate life without him—and solve the mystery of her husband’s disappearances. These three sections comprise an ingenious symphony, as recurring notes and themes deepen and enrich one another: A townhouse in Washington Square Park in Greenwich Village; illness, and treatments that come at a terrible cost; wealth and squalor; the weak and the strong; race; the definition of family, and of nationhood; the dangerous righteousness of the powerful, and of revolutionaries; the longing to find a place in an earthly paradise, and the gradual realization that it can’t exist. What unites not just the characters, but these Americas, are their reckonings with the qualities that make us human: Fear. Love. Shame. Need. Loneliness.
Publisher: Anchor
ISBN: 0385547943
Category : Fiction
Languages : en
Pages : 720
Book Description
#1 NEW YORK TIMES BEST SELLER • From the award-winning, best-selling author of the classic A Little Life—a bold, brilliant novel spanning three centuries and three different versions of the American experiment, about lovers, family, loss and the elusive promise of utopia. A BEST BOOK OF THE YEAR: VOGUE • ESQUIRE • NPR • GOODREADS To Paradise is a fin de siècle novel of marvelous literary effect, but above all it is a work of emotional genius. The great power of this remarkable novel is driven by Yanagihara’s understanding of the aching desire to protect those we love—partners, lovers, children, friends, family, and even our fellow citizens—and the pain that ensues when we cannot. In an alternate version of 1893 America, New York is part of the Free States, where people may live and love whomever they please (or so it seems). The fragile young scion of a distinguished family resists betrothal to a worthy suitor, drawn to a charming music teacher of no means. In a 1993 Manhattan besieged by the AIDS epidemic, a young Hawaiian man lives with his much older, wealthier partner, hiding his troubled childhood and the fate of his father. And in 2093, in a world riven by plagues and governed by totalitarian rule, a powerful scientist’s damaged granddaughter tries to navigate life without him—and solve the mystery of her husband’s disappearances. These three sections comprise an ingenious symphony, as recurring notes and themes deepen and enrich one another: A townhouse in Washington Square Park in Greenwich Village; illness, and treatments that come at a terrible cost; wealth and squalor; the weak and the strong; race; the definition of family, and of nationhood; the dangerous righteousness of the powerful, and of revolutionaries; the longing to find a place in an earthly paradise, and the gradual realization that it can’t exist. What unites not just the characters, but these Americas, are their reckonings with the qualities that make us human: Fear. Love. Shame. Need. Loneliness.
A Brief History of Timekeeping
Author: Chad Orzel
Publisher: BenBella Books
ISBN: 1953295940
Category : Science
Languages : en
Pages : 305
Book Description
2022 NATIONAL INDIE EXCELLENCE AWARDS WINNER — HISTORY: GENERAL ". . . inherently interesting, unique, and highly recommended addition to personal, professional, community, college, and academic library Physics of Time & Scientific Measurement history collections, and supplemental curriculum studies lists.” —Midwest Book Review "A wonderful look into understanding and recording time, Orzel’s latest is appropriate for all readers who are curious about those ticks and tocks that mark nearly every aspect of our lives." —Booklist “A thorough, enjoyable exploration of the history and science behind measuring time.” —Foreword Reviews It’s all a matter of time—literally. From the movements of the spheres to the slipperiness of relativity, the story of science unfolds through the fascinating history of humanity’s efforts to keep time. Our modern lives are ruled by clocks and watches, smartphone apps and calendar programs. While our gadgets may be new, however, the drive to measure and master time is anything but—and in A Brief History of Timekeeping, Chad Orzel traces the path from Stonehenge to your smartphone. Predating written language and marching on through human history, the desire for ever-better timekeeping has spurred technological innovation and sparked theories that radically reshaped our understanding of the universe and our place in it. Orzel, a physicist and the bestselling author of Breakfast with Einstein and How to Teach Quantum Physics to Your Dog continues his tradition of demystifying thorny scientific concepts by using the clocks and calendars central to our everyday activities as a jumping-off point to explore the science underlying the ways we keep track of our time. Ancient solstice markers (which still work perfectly 5,000 years later) depend on the basic astrophysics of our solar system; mechanical clocks owe their development to Newtonian physics; and the ultra-precise atomic timekeeping that enables GPS hinges on the predictable oddities of quantum mechanics. Along the way, Orzel visits the delicate negotiations involved in Gregorian calendar reform, the intricate and entirely unique system employed by the Maya, and how the problem of synchronizing clocks at different locations ultimately required us to abandon the idea of time as an absolute and universal quantity. Sharp and engaging, A Brief History of Timekeeping is a story not just about the science of sundials, sandglasses, and mechanical clocks, but also the politics of calendars and time zones, the philosophy of measurement, and the nature of space and time itself. For those interested in science, technology, or history, or anyone who’s ever wondered about the instruments that divide our days into moments: the time you spend reading this book may fly, and it is certain to be well spent.
Publisher: BenBella Books
ISBN: 1953295940
Category : Science
Languages : en
Pages : 305
Book Description
2022 NATIONAL INDIE EXCELLENCE AWARDS WINNER — HISTORY: GENERAL ". . . inherently interesting, unique, and highly recommended addition to personal, professional, community, college, and academic library Physics of Time & Scientific Measurement history collections, and supplemental curriculum studies lists.” —Midwest Book Review "A wonderful look into understanding and recording time, Orzel’s latest is appropriate for all readers who are curious about those ticks and tocks that mark nearly every aspect of our lives." —Booklist “A thorough, enjoyable exploration of the history and science behind measuring time.” —Foreword Reviews It’s all a matter of time—literally. From the movements of the spheres to the slipperiness of relativity, the story of science unfolds through the fascinating history of humanity’s efforts to keep time. Our modern lives are ruled by clocks and watches, smartphone apps and calendar programs. While our gadgets may be new, however, the drive to measure and master time is anything but—and in A Brief History of Timekeeping, Chad Orzel traces the path from Stonehenge to your smartphone. Predating written language and marching on through human history, the desire for ever-better timekeeping has spurred technological innovation and sparked theories that radically reshaped our understanding of the universe and our place in it. Orzel, a physicist and the bestselling author of Breakfast with Einstein and How to Teach Quantum Physics to Your Dog continues his tradition of demystifying thorny scientific concepts by using the clocks and calendars central to our everyday activities as a jumping-off point to explore the science underlying the ways we keep track of our time. Ancient solstice markers (which still work perfectly 5,000 years later) depend on the basic astrophysics of our solar system; mechanical clocks owe their development to Newtonian physics; and the ultra-precise atomic timekeeping that enables GPS hinges on the predictable oddities of quantum mechanics. Along the way, Orzel visits the delicate negotiations involved in Gregorian calendar reform, the intricate and entirely unique system employed by the Maya, and how the problem of synchronizing clocks at different locations ultimately required us to abandon the idea of time as an absolute and universal quantity. Sharp and engaging, A Brief History of Timekeeping is a story not just about the science of sundials, sandglasses, and mechanical clocks, but also the politics of calendars and time zones, the philosophy of measurement, and the nature of space and time itself. For those interested in science, technology, or history, or anyone who’s ever wondered about the instruments that divide our days into moments: the time you spend reading this book may fly, and it is certain to be well spent.
My Brief History
Author: Stephen Hawking
Publisher: Bantam
ISBN: 0345535286
Category : Science
Languages : en
Pages : 145
Book Description
NATIONAL BESTSELLER Stephen Hawking has dazzled readers worldwide with a string of bestsellers exploring the mysteries of the universe. Now, for the first time, perhaps the most brilliant cosmologist of our age turns his gaze inward for a revealing look at his own life and intellectual evolution. My Brief History recounts Stephen Hawking’s improbable journey, from his postwar London boyhood to his years of international acclaim and celebrity. Lavishly illustrated with rarely seen photographs, this concise, witty, and candid account introduces readers to a Hawking rarely glimpsed in previous books: the inquisitive schoolboy whose classmates nicknamed him Einstein; the jokester who once placed a bet with a colleague over the existence of a particular black hole; and the young husband and father struggling to gain a foothold in the world of physics and cosmology. Writing with characteristic humility and humor, Hawking opens up about the challenges that confronted him following his diagnosis of ALS at age twenty-one. Tracing his development as a thinker, he explains how the prospect of an early death urged him onward through numerous intellectual breakthroughs, and talks about the genesis of his masterpiece A Brief History of Time—one of the iconic books of the twentieth century. Clear-eyed, intimate, and wise, My Brief History opens a window for the rest of us into Hawking’s personal cosmos.
Publisher: Bantam
ISBN: 0345535286
Category : Science
Languages : en
Pages : 145
Book Description
NATIONAL BESTSELLER Stephen Hawking has dazzled readers worldwide with a string of bestsellers exploring the mysteries of the universe. Now, for the first time, perhaps the most brilliant cosmologist of our age turns his gaze inward for a revealing look at his own life and intellectual evolution. My Brief History recounts Stephen Hawking’s improbable journey, from his postwar London boyhood to his years of international acclaim and celebrity. Lavishly illustrated with rarely seen photographs, this concise, witty, and candid account introduces readers to a Hawking rarely glimpsed in previous books: the inquisitive schoolboy whose classmates nicknamed him Einstein; the jokester who once placed a bet with a colleague over the existence of a particular black hole; and the young husband and father struggling to gain a foothold in the world of physics and cosmology. Writing with characteristic humility and humor, Hawking opens up about the challenges that confronted him following his diagnosis of ALS at age twenty-one. Tracing his development as a thinker, he explains how the prospect of an early death urged him onward through numerous intellectual breakthroughs, and talks about the genesis of his masterpiece A Brief History of Time—one of the iconic books of the twentieth century. Clear-eyed, intimate, and wise, My Brief History opens a window for the rest of us into Hawking’s personal cosmos.
A Brief History of the Philosophy of Time, Second Edition
Author: Adrian Bardon
Publisher: Oxford University Press
ISBN: 0197684106
Category : Philosophy
Languages : en
Pages : 233
Book Description
This thoroughly revised and updated edition of Adrian Bardon's A Brief History of the Philosophy of Time is a short introduction to the history, philosophy, and science of the study of time--from the pre-Socratic philosophers through Einstein and beyond. Bardon covers subjects such as time and change, the experience of time, physical and metaphysical approaches to the nature of time, the direction of time, time travel, time and freedom of the will, and scientific and philosophical approaches to cosmology and the beginning of time. He employs helpful illustrations and keeps technical language to a minimum in bringing the resources of over 2500 years of philosophy and science to bear on some of humanity's most fundamental and enduring questions.
Publisher: Oxford University Press
ISBN: 0197684106
Category : Philosophy
Languages : en
Pages : 233
Book Description
This thoroughly revised and updated edition of Adrian Bardon's A Brief History of the Philosophy of Time is a short introduction to the history, philosophy, and science of the study of time--from the pre-Socratic philosophers through Einstein and beyond. Bardon covers subjects such as time and change, the experience of time, physical and metaphysical approaches to the nature of time, the direction of time, time travel, time and freedom of the will, and scientific and philosophical approaches to cosmology and the beginning of time. He employs helpful illustrations and keeps technical language to a minimum in bringing the resources of over 2500 years of philosophy and science to bear on some of humanity's most fundamental and enduring questions.
The 100 Best Nonfiction Books of All Time
Author: Robert McCrum
Publisher:
ISBN: 9781903385838
Category : Literary Criticism
Languages : en
Pages : 0
Book Description
Beginning in 1611 with the King James Bible and ending in 2014 with Elizabeth Kolbert's 'The Sixth Extinction', this extraordinary voyage through the written treasures of our culture examines universally-acclaimed classics such as Pepys' 'Diaries', Charles Darwin's 'The Origin of Species', Stephen Hawking's 'A Brief History of Time' and a whole host of additional works --
Publisher:
ISBN: 9781903385838
Category : Literary Criticism
Languages : en
Pages : 0
Book Description
Beginning in 1611 with the King James Bible and ending in 2014 with Elizabeth Kolbert's 'The Sixth Extinction', this extraordinary voyage through the written treasures of our culture examines universally-acclaimed classics such as Pepys' 'Diaries', Charles Darwin's 'The Origin of Species', Stephen Hawking's 'A Brief History of Time' and a whole host of additional works --
A Briefer History of Time
Author: Eric Schulman
Publisher: St. Martin's Press
ISBN: 9780716733898
Category : Humor
Languages : en
Pages : 196
Book Description
From the Big Bang to the evolution of humans and the resignation of Richard Nixon, A Brief History of Time is a highly irreverent, historically entertaining, and scientifically correct overview of the most important cosmic milestones since the beginning of time. From learning how to make a star with Martha Stewart ("I love stars because they provide an opportunity to be so wonderfully creative with such simple ingredients") to a classic potboiler account of the first instance of molecular reproduction ("It was a dark and stormy tide pool"), to the unhappily-ever-after fairy tale of Shelly Shrew and her dinosaur friends ("Once upon a time, on a warm June day about 65 million years ago, while Shelley Shrew was sleeping under a big green leaf on an island near the Yucatan Peninsula in what is now Mexico, a comet hit her on the head and killed her instantly"), Eric Schulman offers readers a whizbang collection of the universe's greatest hits. Unique, funny, and educational, A Brief(er) History of Time is the perfect book for readers who want to know what's been going on for the past 15 billion years, but don't have a lot of time.
Publisher: St. Martin's Press
ISBN: 9780716733898
Category : Humor
Languages : en
Pages : 196
Book Description
From the Big Bang to the evolution of humans and the resignation of Richard Nixon, A Brief History of Time is a highly irreverent, historically entertaining, and scientifically correct overview of the most important cosmic milestones since the beginning of time. From learning how to make a star with Martha Stewart ("I love stars because they provide an opportunity to be so wonderfully creative with such simple ingredients") to a classic potboiler account of the first instance of molecular reproduction ("It was a dark and stormy tide pool"), to the unhappily-ever-after fairy tale of Shelly Shrew and her dinosaur friends ("Once upon a time, on a warm June day about 65 million years ago, while Shelley Shrew was sleeping under a big green leaf on an island near the Yucatan Peninsula in what is now Mexico, a comet hit her on the head and killed her instantly"), Eric Schulman offers readers a whizbang collection of the universe's greatest hits. Unique, funny, and educational, A Brief(er) History of Time is the perfect book for readers who want to know what's been going on for the past 15 billion years, but don't have a lot of time.
Superforce
Author: Paul Davies
Publisher: Simon and Schuster
ISBN: 0671605739
Category : Science
Languages : en
Pages : 269
Book Description
From Simon & Schuster, Superforce is Paul Davies' latest work that searches for a grand unified theory of nature. Superforce explains how recent discoveries in physics and the new cosmology have transformed concepts of the physical world by linking space, time, matter, force, creation, order, and mind into the ultimate scientific theory.
Publisher: Simon and Schuster
ISBN: 0671605739
Category : Science
Languages : en
Pages : 269
Book Description
From Simon & Schuster, Superforce is Paul Davies' latest work that searches for a grand unified theory of nature. Superforce explains how recent discoveries in physics and the new cosmology have transformed concepts of the physical world by linking space, time, matter, force, creation, order, and mind into the ultimate scientific theory.