Author: Martin J. S. Rudwick
Publisher: University of Chicago Press
ISBN: 0226731081
Category : Science
Languages : en
Pages : 320
Book Description
French zoologist Georges Cuvier (1769-1832) helped form and bring credibility to geology and paleontology. Here Martin J. S. Rudwick provides the first modern translation of Cuvier's essential writings on fossils and catastrophes and links these translated texts together with his own insightful narrative and interpretive commentary. "Martin Rudwick has done English-speaking science a considerable service by translating and commenting on Cuvier's work. . . . He guides us through Cuvier's most important writings, especially those which demonstrate his new technique of comparative anatomy."—Douglas Palmer, New Scientist
Georges Cuvier, Fossil Bones, and Geological Catastrophes
Author: Martin J. S. Rudwick
Publisher: University of Chicago Press
ISBN: 0226731081
Category : Science
Languages : en
Pages : 320
Book Description
French zoologist Georges Cuvier (1769-1832) helped form and bring credibility to geology and paleontology. Here Martin J. S. Rudwick provides the first modern translation of Cuvier's essential writings on fossils and catastrophes and links these translated texts together with his own insightful narrative and interpretive commentary. "Martin Rudwick has done English-speaking science a considerable service by translating and commenting on Cuvier's work. . . . He guides us through Cuvier's most important writings, especially those which demonstrate his new technique of comparative anatomy."—Douglas Palmer, New Scientist
Publisher: University of Chicago Press
ISBN: 0226731081
Category : Science
Languages : en
Pages : 320
Book Description
French zoologist Georges Cuvier (1769-1832) helped form and bring credibility to geology and paleontology. Here Martin J. S. Rudwick provides the first modern translation of Cuvier's essential writings on fossils and catastrophes and links these translated texts together with his own insightful narrative and interpretive commentary. "Martin Rudwick has done English-speaking science a considerable service by translating and commenting on Cuvier's work. . . . He guides us through Cuvier's most important writings, especially those which demonstrate his new technique of comparative anatomy."—Douglas Palmer, New Scientist
Worlds Before Adam
Author: Martin J. S. Rudwick
Publisher: University of Chicago Press
ISBN: 0226731308
Category : Science
Languages : en
Pages : 639
Book Description
In the late eighteenth and early nineteenth centuries, scientists reconstructed the immensely long history of the earth—and the relatively recent arrival of human life. The geologists of the period, many of whom were devout believers, agreed about this vast timescale. But despite this apparent harmony between geology and Genesis, these scientists still debated a great many questions: Had the earth cooled from its origin as a fiery ball in space, or had it always been the same kind of place as it is now? Was prehuman life marked by mass extinctions, or had fauna and flora changed slowly over time? The first detailed account of the reconstruction of prehuman geohistory, Martin J. S. Rudwick’s Worlds Before Adam picks up where his celebrated Bursting the Limits of Time leaves off. Here, Rudwick takes readers from the post-Napoleonic Restoration in Europe to the early years of Britain’s Victorian age, chronicling the staggering discoveries geologists made during the period: the unearthing of the first dinosaur fossils, the glacial theory of the last ice age, and the meaning of igneous rocks, among others. Ultimately, Rudwick reveals geology to be the first of the sciences to investigate the historical dimension of nature, a model that Charles Darwin used in developing his evolutionary theory. Featuring an international cast of colorful characters, with Georges Cuvier and Charles Lyell playing major roles and Darwin appearing as a young geologist, Worlds Before Adam is a worthy successor to Rudwick’s magisterial first volume. Completing the highly readable narrative of one of the most momentous changes in human understanding of our place in the natural world, Worlds Before Adam is a capstone to the career of one of the world’s leading historians of science.
Publisher: University of Chicago Press
ISBN: 0226731308
Category : Science
Languages : en
Pages : 639
Book Description
In the late eighteenth and early nineteenth centuries, scientists reconstructed the immensely long history of the earth—and the relatively recent arrival of human life. The geologists of the period, many of whom were devout believers, agreed about this vast timescale. But despite this apparent harmony between geology and Genesis, these scientists still debated a great many questions: Had the earth cooled from its origin as a fiery ball in space, or had it always been the same kind of place as it is now? Was prehuman life marked by mass extinctions, or had fauna and flora changed slowly over time? The first detailed account of the reconstruction of prehuman geohistory, Martin J. S. Rudwick’s Worlds Before Adam picks up where his celebrated Bursting the Limits of Time leaves off. Here, Rudwick takes readers from the post-Napoleonic Restoration in Europe to the early years of Britain’s Victorian age, chronicling the staggering discoveries geologists made during the period: the unearthing of the first dinosaur fossils, the glacial theory of the last ice age, and the meaning of igneous rocks, among others. Ultimately, Rudwick reveals geology to be the first of the sciences to investigate the historical dimension of nature, a model that Charles Darwin used in developing his evolutionary theory. Featuring an international cast of colorful characters, with Georges Cuvier and Charles Lyell playing major roles and Darwin appearing as a young geologist, Worlds Before Adam is a worthy successor to Rudwick’s magisterial first volume. Completing the highly readable narrative of one of the most momentous changes in human understanding of our place in the natural world, Worlds Before Adam is a capstone to the career of one of the world’s leading historians of science.
Bursting the Limits of Time
Author: Martin J. S. Rudwick
Publisher: University of Chicago Press
ISBN: 0226731146
Category : Science
Languages : en
Pages : 733
Book Description
In 1650, Archbishop James Ussher of Armagh joined the long-running theological debate on the age of the earth by famously announcing that creation had occurred on October 23, 4004 B.C. Although widely challenged during the Enlightenment, this belief in a six-thousand-year-old planet was only laid to rest during a revolution of discovery in the late eighteenth and early nineteenth centuries. In this relatively brief period, geologists reconstructed the immensely long history of the earth-and the relatively recent arrival of human life. Highlighting a discovery that radically altered existing perceptions of a human's place in the universe as much as the theories of Copernicus, Darwin, and Freud did, Bursting the Limits of Time is a herculean effort by one of the world's foremost experts on the history of geology and paleontology to sketch this historicization of the natural world in the age of revolution. Addressing this intellectual revolution for the first time, Rudwick examines the ideas and practices of earth scientists throughout the Western world to show how the story of what we now call "deep time" was pieced together. He explores who was responsible for the discovery of the earth's history, refutes the concept of a rift between science and religion in dating the earth, and details how the study of the history of the earth helped define a new branch of science called geology. Rooting his analysis in a detailed study of primary sources, Rudwick emphasizes the lasting importance of field- and museum-based research of the eighteenth and nineteenth centuries. Bursting the Limits of Time, the culmination of more than three decades of research, is the first detailed account of this monumental phase in the history of science.
Publisher: University of Chicago Press
ISBN: 0226731146
Category : Science
Languages : en
Pages : 733
Book Description
In 1650, Archbishop James Ussher of Armagh joined the long-running theological debate on the age of the earth by famously announcing that creation had occurred on October 23, 4004 B.C. Although widely challenged during the Enlightenment, this belief in a six-thousand-year-old planet was only laid to rest during a revolution of discovery in the late eighteenth and early nineteenth centuries. In this relatively brief period, geologists reconstructed the immensely long history of the earth-and the relatively recent arrival of human life. Highlighting a discovery that radically altered existing perceptions of a human's place in the universe as much as the theories of Copernicus, Darwin, and Freud did, Bursting the Limits of Time is a herculean effort by one of the world's foremost experts on the history of geology and paleontology to sketch this historicization of the natural world in the age of revolution. Addressing this intellectual revolution for the first time, Rudwick examines the ideas and practices of earth scientists throughout the Western world to show how the story of what we now call "deep time" was pieced together. He explores who was responsible for the discovery of the earth's history, refutes the concept of a rift between science and religion in dating the earth, and details how the study of the history of the earth helped define a new branch of science called geology. Rooting his analysis in a detailed study of primary sources, Rudwick emphasizes the lasting importance of field- and museum-based research of the eighteenth and nineteenth centuries. Bursting the Limits of Time, the culmination of more than three decades of research, is the first detailed account of this monumental phase in the history of science.
The Earth on Show
Author: Ralph O'Connor
Publisher: University of Chicago Press
ISBN: 0226616703
Category : Science
Languages : en
Pages : 557
Book Description
At the turn of the nineteenth century, geology—and its claims that the earth had a long and colorful prehuman history—was widely dismissedasdangerous nonsense. But just fifty years later, it was the most celebrated of Victorian sciences. Ralph O’Connor tracks the astonishing growth of geology’s prestige in Britain, exploring how a new geohistory far more alluring than the standard six days of Creation was assembled and sold to the wider Bible-reading public. Shrewd science-writers, O’Connor shows, marketed spectacular visions of past worlds, piquing the public imagination with glimpses of man-eating mammoths, talking dinosaurs, and sea-dragons spawned by Satan himself. These authors—including men of science, women, clergymen, biblical literalists, hack writers, blackmailers, and prophets—borrowed freely from the Bible, modern poetry, and the urban entertainment industry, creating new forms of literature in order to transport their readers into a vanished and alien past. In exploring the use of poetry and spectacle in the promotion of popular science, O’Connor proves that geology’s success owed much to the literary techniques of its authors. An innovative blend of the history of science, literary criticism, book history, and visual culture, The Earth on Show rethinks the relationship between science and literature in the nineteenth century.
Publisher: University of Chicago Press
ISBN: 0226616703
Category : Science
Languages : en
Pages : 557
Book Description
At the turn of the nineteenth century, geology—and its claims that the earth had a long and colorful prehuman history—was widely dismissedasdangerous nonsense. But just fifty years later, it was the most celebrated of Victorian sciences. Ralph O’Connor tracks the astonishing growth of geology’s prestige in Britain, exploring how a new geohistory far more alluring than the standard six days of Creation was assembled and sold to the wider Bible-reading public. Shrewd science-writers, O’Connor shows, marketed spectacular visions of past worlds, piquing the public imagination with glimpses of man-eating mammoths, talking dinosaurs, and sea-dragons spawned by Satan himself. These authors—including men of science, women, clergymen, biblical literalists, hack writers, blackmailers, and prophets—borrowed freely from the Bible, modern poetry, and the urban entertainment industry, creating new forms of literature in order to transport their readers into a vanished and alien past. In exploring the use of poetry and spectacle in the promotion of popular science, O’Connor proves that geology’s success owed much to the literary techniques of its authors. An innovative blend of the history of science, literary criticism, book history, and visual culture, The Earth on Show rethinks the relationship between science and literature in the nineteenth century.
Earth's Deep History
Author: Martin J. S. Rudwick
Publisher: University of Chicago Press
ISBN: 022620409X
Category : Science
Languages : en
Pages : 371
Book Description
“Tells the story . . . of how ‘natural philosophers’ developed the ideas of geology accepted today . . . Fascinating.” —San Francisco Book Review Earth has been witness to dinosaurs, global ice ages, continents colliding or splitting apart, and comets and asteroids crashing, as well as the birth of humans who are curious to understand it. But how was all this discovered? How was the evidence for it collected and interpreted? In this sweeping and accessible book, Martin J. S. Rudwick, the premier historian of the Earth sciences, tells the gripping human story of the gradual realization that the Earth’s history has not only been long but also astonishingly eventful. Rudwick begins in the seventeenth century with Archbishop James Ussher, who famously dated the creation of the cosmos to 4004 BC. His narrative later turns to the late eighteenth and early nineteenth centuries, when geological evidence was used—and is still being used—to reconstruct a history of the Earth that is as varied and unpredictable as human history. itself. Along the way, Rudwick rejects the popular view of this story as a conflict between science and religion and shows how the modern scientific account of the Earth’s deep history retains strong roots in Judeo-Christian ideas. Extensively illustrated, Earth’s Deep History is an engaging and impressive capstone to Rudwick’s distinguished career. “Deftly explains how ideas of natural history were embedded in cultural history.” —Nature “An engaging read for nonscientists and specialists alike.” —Library Journal “Wonderfully erudite and absorbing.” —Times Literary Supplement “Fascinating, well written, and novel . . . Essential.” —Choice “Thrilling.” —London Review of Books
Publisher: University of Chicago Press
ISBN: 022620409X
Category : Science
Languages : en
Pages : 371
Book Description
“Tells the story . . . of how ‘natural philosophers’ developed the ideas of geology accepted today . . . Fascinating.” —San Francisco Book Review Earth has been witness to dinosaurs, global ice ages, continents colliding or splitting apart, and comets and asteroids crashing, as well as the birth of humans who are curious to understand it. But how was all this discovered? How was the evidence for it collected and interpreted? In this sweeping and accessible book, Martin J. S. Rudwick, the premier historian of the Earth sciences, tells the gripping human story of the gradual realization that the Earth’s history has not only been long but also astonishingly eventful. Rudwick begins in the seventeenth century with Archbishop James Ussher, who famously dated the creation of the cosmos to 4004 BC. His narrative later turns to the late eighteenth and early nineteenth centuries, when geological evidence was used—and is still being used—to reconstruct a history of the Earth that is as varied and unpredictable as human history. itself. Along the way, Rudwick rejects the popular view of this story as a conflict between science and religion and shows how the modern scientific account of the Earth’s deep history retains strong roots in Judeo-Christian ideas. Extensively illustrated, Earth’s Deep History is an engaging and impressive capstone to Rudwick’s distinguished career. “Deftly explains how ideas of natural history were embedded in cultural history.” —Nature “An engaging read for nonscientists and specialists alike.” —Library Journal “Wonderfully erudite and absorbing.” —Times Literary Supplement “Fascinating, well written, and novel . . . Essential.” —Choice “Thrilling.” —London Review of Books
At the Water's Edge
Author: Carl Zimmer
Publisher: Simon and Schuster
ISBN: 0684856239
Category : Juvenile Nonfiction
Languages : en
Pages : 304
Book Description
Everybody Out of the Pond At the Water's Edge will change the way you think about your place in the world. The awesome journey of life's transformation from the first microbes 4 billion years ago to Homo sapiens today is an epic that we are only now beginning to grasp. Magnificent and bizarre, it is the story of how we got here, what we left behind, and what we brought with us. We all know about evolution, but it still seems absurd that our ancestors were fish. Darwin's idea of natural selection was the key to solving generation-to-generation evolution -- microevolution -- but it could only point us toward a complete explanation, still to come, of the engines of macroevolution, the transformation of body shapes across millions of years. Now, drawing on the latest fossil discoveries and breakthrough scientific analysis, Carl Zimmer reveals how macroevolution works. Escorting us along the trail of discovery up to the current dramatic research in paleontology, ecology, genetics, and embryology, Zimmer shows how scientists today are unveiling the secrets of life that biologists struggled with two centuries ago. In this book, you will find a dazzling, brash literary talent and a rigorous scientific sensibility gracefully brought together. Carl Zimmer provides a comprehensive, lucid, and authoritative answer to the mystery of how nature actually made itself.
Publisher: Simon and Schuster
ISBN: 0684856239
Category : Juvenile Nonfiction
Languages : en
Pages : 304
Book Description
Everybody Out of the Pond At the Water's Edge will change the way you think about your place in the world. The awesome journey of life's transformation from the first microbes 4 billion years ago to Homo sapiens today is an epic that we are only now beginning to grasp. Magnificent and bizarre, it is the story of how we got here, what we left behind, and what we brought with us. We all know about evolution, but it still seems absurd that our ancestors were fish. Darwin's idea of natural selection was the key to solving generation-to-generation evolution -- microevolution -- but it could only point us toward a complete explanation, still to come, of the engines of macroevolution, the transformation of body shapes across millions of years. Now, drawing on the latest fossil discoveries and breakthrough scientific analysis, Carl Zimmer reveals how macroevolution works. Escorting us along the trail of discovery up to the current dramatic research in paleontology, ecology, genetics, and embryology, Zimmer shows how scientists today are unveiling the secrets of life that biologists struggled with two centuries ago. In this book, you will find a dazzling, brash literary talent and a rigorous scientific sensibility gracefully brought together. Carl Zimmer provides a comprehensive, lucid, and authoritative answer to the mystery of how nature actually made itself.
The Rocks Don't Lie: A Geologist Investigates Noah's Flood
Author: David R. Montgomery
Publisher: W. W. Norton & Company
ISBN: 0393083969
Category : Science
Languages : en
Pages : 305
Book Description
How the mystery of the Bible's greatest story shaped geology: a MacArthur Fellow presents a surprising perspective on Noah's Flood. In Tibet, geologist David R. Montgomery heard a local story about a great flood that bore a striking similarity to Noah’s Flood. Intrigued, Montgomery began investigating the world’s flood stories and—drawing from historic works by theologians, natural philosophers, and scientists—discovered the counterintuitive role Noah’s Flood played in the development of both geology and creationism. Steno, the grandfather of geology, even invoked the Flood in laying geology’s founding principles based on his observations of northern Italian landscapes. Centuries later, the founders of modern creationism based their irrational view of a global flood on a perceptive critique of geology. With an explorer’s eye and a refreshing approach to both faith and science, Montgomery takes readers on a journey across landscapes and cultures. In the process we discover the illusive nature of truth, whether viewed through the lens of science or religion, and how it changed through history and continues changing, even today.
Publisher: W. W. Norton & Company
ISBN: 0393083969
Category : Science
Languages : en
Pages : 305
Book Description
How the mystery of the Bible's greatest story shaped geology: a MacArthur Fellow presents a surprising perspective on Noah's Flood. In Tibet, geologist David R. Montgomery heard a local story about a great flood that bore a striking similarity to Noah’s Flood. Intrigued, Montgomery began investigating the world’s flood stories and—drawing from historic works by theologians, natural philosophers, and scientists—discovered the counterintuitive role Noah’s Flood played in the development of both geology and creationism. Steno, the grandfather of geology, even invoked the Flood in laying geology’s founding principles based on his observations of northern Italian landscapes. Centuries later, the founders of modern creationism based their irrational view of a global flood on a perceptive critique of geology. With an explorer’s eye and a refreshing approach to both faith and science, Montgomery takes readers on a journey across landscapes and cultures. In the process we discover the illusive nature of truth, whether viewed through the lens of science or religion, and how it changed through history and continues changing, even today.
Strata
Author: Oxford University Museum of Natural History
Publisher:
ISBN: 9780226754888
Category : History
Languages : en
Pages : 256
Book Description
"The story starts with William Smith's early years, from apprentice to surveyor for hire, and from publication of his groundbreaking 1815 geological strata map to imprisonment for debt. Smith's 1799 geological map of Bath and table of strata, his first strata map of England and Wales, published in 1801, and photographs of some of Smith's collection of 2,000 fossils illustrate the tale. The remainder of the book is organized into four parts, each beginning with four sheets from Smith's hand-colored, 1815 strata map, accompanied by related geological cross sections and county maps (1819-24), and followed by sections of Sowerby's fossil illustrations (1816-19), organized by strata. Interleaved between the sections are essays by scholars that focus on the people and industries that benefited from the knowledge imparted by Smith's work. Concluding the volume are reflections on Smith's later years as an itinerant geologist and surveyor, plagiarism by a rival, receipt of the first Wollaston Medal in recognition of his achievements, and the influence of his geological mapping and biostratigraphical theories on the sciences, which culminated in the establishment of the modern geological timescale"--
Publisher:
ISBN: 9780226754888
Category : History
Languages : en
Pages : 256
Book Description
"The story starts with William Smith's early years, from apprentice to surveyor for hire, and from publication of his groundbreaking 1815 geological strata map to imprisonment for debt. Smith's 1799 geological map of Bath and table of strata, his first strata map of England and Wales, published in 1801, and photographs of some of Smith's collection of 2,000 fossils illustrate the tale. The remainder of the book is organized into four parts, each beginning with four sheets from Smith's hand-colored, 1815 strata map, accompanied by related geological cross sections and county maps (1819-24), and followed by sections of Sowerby's fossil illustrations (1816-19), organized by strata. Interleaved between the sections are essays by scholars that focus on the people and industries that benefited from the knowledge imparted by Smith's work. Concluding the volume are reflections on Smith's later years as an itinerant geologist and surveyor, plagiarism by a rival, receipt of the first Wollaston Medal in recognition of his achievements, and the influence of his geological mapping and biostratigraphical theories on the sciences, which culminated in the establishment of the modern geological timescale"--
On the Nature of Limbs
Author: Richard Owen
Publisher: University of Chicago Press
ISBN: 0226641953
Category : Science
Languages : en
Pages : 231
Book Description
The most prominent naturalist in Britain before Charles Darwin, Richard Owen made empirical discoveries and offered theoretical innovations that were crucial to the proof of evolution. Among his many lasting contributions to science was the first clear definition of the term homology—“the same organ in different animals under every variety of form and function.” He also graphically demonstrated that all vertebrate species were built on the same skeletal plan and devised the vertebrate archetype as a representation of the simplest common form of all vertebrates. Just as Darwin’s ideas continue to propel the modern study of adaptation, so too will Owen’s contributions fuel the new interest in homology, organic form, and evolutionary developmental biology. His theory of the archetype and his views on species origins were first offered to the general public in On the Nature of Limbs, published in 1849. It reemerges here in a facsimile edition with introductory essays by prominent historians, philosophers, and practitioners from the modern evo-devo community.
Publisher: University of Chicago Press
ISBN: 0226641953
Category : Science
Languages : en
Pages : 231
Book Description
The most prominent naturalist in Britain before Charles Darwin, Richard Owen made empirical discoveries and offered theoretical innovations that were crucial to the proof of evolution. Among his many lasting contributions to science was the first clear definition of the term homology—“the same organ in different animals under every variety of form and function.” He also graphically demonstrated that all vertebrate species were built on the same skeletal plan and devised the vertebrate archetype as a representation of the simplest common form of all vertebrates. Just as Darwin’s ideas continue to propel the modern study of adaptation, so too will Owen’s contributions fuel the new interest in homology, organic form, and evolutionary developmental biology. His theory of the archetype and his views on species origins were first offered to the general public in On the Nature of Limbs, published in 1849. It reemerges here in a facsimile edition with introductory essays by prominent historians, philosophers, and practitioners from the modern evo-devo community.
The Sixth Extinction
Author: Elizabeth Kolbert
Publisher: Henry Holt and Company
ISBN: 0805099794
Category : Nature
Languages : en
Pages : 336
Book Description
ONE OF THE NEW YORK TIMES BOOK REVIEW'S 10 BEST BOOKS OF THE YEAR A major book about the future of the world, blending intellectual and natural history and field reporting into a powerful account of the mass extinction unfolding before our eyes Over the last half a billion years, there have been five mass extinctions, when the diversity of life on earth suddenly and dramatically contracted. Scientists around the world are currently monitoring the sixth extinction, predicted to be the most devastating extinction event since the asteroid impact that wiped out the dinosaurs. This time around, the cataclysm is us. In The Sixth Extinction, two-time winner of the National Magazine Award and New Yorker writer Elizabeth Kolbert draws on the work of scores of researchers in half a dozen disciplines, accompanying many of them into the field: geologists who study deep ocean cores, botanists who follow the tree line as it climbs up the Andes, marine biologists who dive off the Great Barrier Reef. She introduces us to a dozen species, some already gone, others facing extinction, including the Panamian golden frog, staghorn coral, the great auk, and the Sumatran rhino. Through these stories, Kolbert provides a moving account of the disappearances occurring all around us and traces the evolution of extinction as concept, from its first articulation by Georges Cuvier in revolutionary Paris up through the present day. The sixth extinction is likely to be mankind's most lasting legacy; as Kolbert observes, it compels us to rethink the fundamental question of what it means to be human.
Publisher: Henry Holt and Company
ISBN: 0805099794
Category : Nature
Languages : en
Pages : 336
Book Description
ONE OF THE NEW YORK TIMES BOOK REVIEW'S 10 BEST BOOKS OF THE YEAR A major book about the future of the world, blending intellectual and natural history and field reporting into a powerful account of the mass extinction unfolding before our eyes Over the last half a billion years, there have been five mass extinctions, when the diversity of life on earth suddenly and dramatically contracted. Scientists around the world are currently monitoring the sixth extinction, predicted to be the most devastating extinction event since the asteroid impact that wiped out the dinosaurs. This time around, the cataclysm is us. In The Sixth Extinction, two-time winner of the National Magazine Award and New Yorker writer Elizabeth Kolbert draws on the work of scores of researchers in half a dozen disciplines, accompanying many of them into the field: geologists who study deep ocean cores, botanists who follow the tree line as it climbs up the Andes, marine biologists who dive off the Great Barrier Reef. She introduces us to a dozen species, some already gone, others facing extinction, including the Panamian golden frog, staghorn coral, the great auk, and the Sumatran rhino. Through these stories, Kolbert provides a moving account of the disappearances occurring all around us and traces the evolution of extinction as concept, from its first articulation by Georges Cuvier in revolutionary Paris up through the present day. The sixth extinction is likely to be mankind's most lasting legacy; as Kolbert observes, it compels us to rethink the fundamental question of what it means to be human.