Author: Huston Diehl
Publisher: University of Iowa Press
ISBN: 1587297167
Category : Biography & Autobiography
Languages : en
Pages : 262
Book Description
When Huston Diehl began teaching a fourth-grade class in a "Negro" elementary school in rural Louisa County, Virginia, the school’s white superintendent assured her that he didn't expect her to teach "those children" anything. She soon discovered how these low expectations, widely shared by the white community, impeded her students' ability to learn. With its overcrowded classrooms, poorly trained teachers, empty bookshelves, and meager supplies, her segregated school was vastly inferior to the county's white elementary schools, and the message it sent her students was clear: "dream not of other worlds." In her often lyrical memoir, Diehl reveals how, in the intimacy of the classroom, her students reached out to her, a young white northerner, and shared their fears, anxieties, and personal beliefs. Repeatedly surprised and challenged by her students, Diehl questions her long-standing middle-class assumptions and confronts her own prejudices. In doing so, she eloquently reflects on what the students taught her about the hurt of bigotry and the humiliation of poverty as well as dignity, courage, and resiliency. Set in the waning days of the Jim Crow South, Dream Not of Other Worlds chronicles an important moment in American history. Diehl examines the history of black education in the South and narrates the dramatic struggle to integrate Virginia's public schools. Meeting with some of her former students and colleagues and visiting the school where she once taught, she considers what has--and has not--changed after more than thirty years of integrated schooling. This provocative book raises many issues that are of urgent concern today: the continuing social consequences of segregated schools, the role of public education in American society, and the challenges of educating minority and poor children.
Dream Not of Other Worlds
Author: Huston Diehl
Publisher: University of Iowa Press
ISBN: 1587297167
Category : Biography & Autobiography
Languages : en
Pages : 262
Book Description
When Huston Diehl began teaching a fourth-grade class in a "Negro" elementary school in rural Louisa County, Virginia, the school’s white superintendent assured her that he didn't expect her to teach "those children" anything. She soon discovered how these low expectations, widely shared by the white community, impeded her students' ability to learn. With its overcrowded classrooms, poorly trained teachers, empty bookshelves, and meager supplies, her segregated school was vastly inferior to the county's white elementary schools, and the message it sent her students was clear: "dream not of other worlds." In her often lyrical memoir, Diehl reveals how, in the intimacy of the classroom, her students reached out to her, a young white northerner, and shared their fears, anxieties, and personal beliefs. Repeatedly surprised and challenged by her students, Diehl questions her long-standing middle-class assumptions and confronts her own prejudices. In doing so, she eloquently reflects on what the students taught her about the hurt of bigotry and the humiliation of poverty as well as dignity, courage, and resiliency. Set in the waning days of the Jim Crow South, Dream Not of Other Worlds chronicles an important moment in American history. Diehl examines the history of black education in the South and narrates the dramatic struggle to integrate Virginia's public schools. Meeting with some of her former students and colleagues and visiting the school where she once taught, she considers what has--and has not--changed after more than thirty years of integrated schooling. This provocative book raises many issues that are of urgent concern today: the continuing social consequences of segregated schools, the role of public education in American society, and the challenges of educating minority and poor children.
Publisher: University of Iowa Press
ISBN: 1587297167
Category : Biography & Autobiography
Languages : en
Pages : 262
Book Description
When Huston Diehl began teaching a fourth-grade class in a "Negro" elementary school in rural Louisa County, Virginia, the school’s white superintendent assured her that he didn't expect her to teach "those children" anything. She soon discovered how these low expectations, widely shared by the white community, impeded her students' ability to learn. With its overcrowded classrooms, poorly trained teachers, empty bookshelves, and meager supplies, her segregated school was vastly inferior to the county's white elementary schools, and the message it sent her students was clear: "dream not of other worlds." In her often lyrical memoir, Diehl reveals how, in the intimacy of the classroom, her students reached out to her, a young white northerner, and shared their fears, anxieties, and personal beliefs. Repeatedly surprised and challenged by her students, Diehl questions her long-standing middle-class assumptions and confronts her own prejudices. In doing so, she eloquently reflects on what the students taught her about the hurt of bigotry and the humiliation of poverty as well as dignity, courage, and resiliency. Set in the waning days of the Jim Crow South, Dream Not of Other Worlds chronicles an important moment in American history. Diehl examines the history of black education in the South and narrates the dramatic struggle to integrate Virginia's public schools. Meeting with some of her former students and colleagues and visiting the school where she once taught, she considers what has--and has not--changed after more than thirty years of integrated schooling. This provocative book raises many issues that are of urgent concern today: the continuing social consequences of segregated schools, the role of public education in American society, and the challenges of educating minority and poor children.
Dreams of Other Worlds
Author: Chris Impey
Publisher: Princeton University Press
ISBN: 0691169225
Category : Science
Languages : en
Pages : 458
Book Description
The story of unmanned space exploration, from Viking to today Dreams of Other Worlds describes the unmanned space missions that have opened new windows on distant worlds. Spanning four decades of dramatic advances in astronomy and planetary science, this book tells the story of eleven iconic exploratory missions and how they have fundamentally transformed our scientific and cultural perspectives on the universe and our place in it. The journey begins with the Viking and Mars Exploration Rover missions to Mars, which paint a startling picture of a planet at the cusp of habitability. It then moves into the realm of the gas giants with the Voyager probes and Cassini's ongoing exploration of the moons of Saturn. The Stardust probe's dramatic round-trip encounter with a comet is brought vividly to life, as are the SOHO and Hipparcos missions to study the Sun and Milky Way. This stunningly illustrated book also explores how our view of the universe has been brought into sharp focus by NASA's great observatories—Spitzer, Chandra, and Hubble—and how the WMAP mission has provided rare glimpses of the dawn of creation. Dreams of Other Worlds reveals how these unmanned exploratory missions have redefined what it means to be the temporary tenants of a small planet in a vast cosmos.
Publisher: Princeton University Press
ISBN: 0691169225
Category : Science
Languages : en
Pages : 458
Book Description
The story of unmanned space exploration, from Viking to today Dreams of Other Worlds describes the unmanned space missions that have opened new windows on distant worlds. Spanning four decades of dramatic advances in astronomy and planetary science, this book tells the story of eleven iconic exploratory missions and how they have fundamentally transformed our scientific and cultural perspectives on the universe and our place in it. The journey begins with the Viking and Mars Exploration Rover missions to Mars, which paint a startling picture of a planet at the cusp of habitability. It then moves into the realm of the gas giants with the Voyager probes and Cassini's ongoing exploration of the moons of Saturn. The Stardust probe's dramatic round-trip encounter with a comet is brought vividly to life, as are the SOHO and Hipparcos missions to study the Sun and Milky Way. This stunningly illustrated book also explores how our view of the universe has been brought into sharp focus by NASA's great observatories—Spitzer, Chandra, and Hubble—and how the WMAP mission has provided rare glimpses of the dawn of creation. Dreams of Other Worlds reveals how these unmanned exploratory missions have redefined what it means to be the temporary tenants of a small planet in a vast cosmos.
Dreams of Other Worlds
Author: Chris Impey
Publisher: Princeton University Press
ISBN: 1400881285
Category : Science
Languages : en
Pages : 459
Book Description
The story of unmanned space exploration, from Viking to today Dreams of Other Worlds describes the unmanned space missions that have opened new windows on distant worlds. Spanning four decades of dramatic advances in astronomy and planetary science, this book tells the story of eleven iconic exploratory missions and how they have fundamentally transformed our scientific and cultural perspectives on the universe and our place in it. The journey begins with the Viking and Mars Exploration Rover missions to Mars, which paint a startling picture of a planet at the cusp of habitability. It then moves into the realm of the gas giants with the Voyager probes and Cassini's ongoing exploration of the moons of Saturn. The Stardust probe's dramatic round-trip encounter with a comet is brought vividly to life, as are the SOHO and Hipparcos missions to study the Sun and Milky Way. This stunningly illustrated book also explores how our view of the universe has been brought into sharp focus by NASA's great observatories—Spitzer, Chandra, and Hubble—and how the WMAP mission has provided rare glimpses of the dawn of creation. Dreams of Other Worlds reveals how these unmanned exploratory missions have redefined what it means to be the temporary tenants of a small planet in a vast cosmos.
Publisher: Princeton University Press
ISBN: 1400881285
Category : Science
Languages : en
Pages : 459
Book Description
The story of unmanned space exploration, from Viking to today Dreams of Other Worlds describes the unmanned space missions that have opened new windows on distant worlds. Spanning four decades of dramatic advances in astronomy and planetary science, this book tells the story of eleven iconic exploratory missions and how they have fundamentally transformed our scientific and cultural perspectives on the universe and our place in it. The journey begins with the Viking and Mars Exploration Rover missions to Mars, which paint a startling picture of a planet at the cusp of habitability. It then moves into the realm of the gas giants with the Voyager probes and Cassini's ongoing exploration of the moons of Saturn. The Stardust probe's dramatic round-trip encounter with a comet is brought vividly to life, as are the SOHO and Hipparcos missions to study the Sun and Milky Way. This stunningly illustrated book also explores how our view of the universe has been brought into sharp focus by NASA's great observatories—Spitzer, Chandra, and Hubble—and how the WMAP mission has provided rare glimpses of the dawn of creation. Dreams of Other Worlds reveals how these unmanned exploratory missions have redefined what it means to be the temporary tenants of a small planet in a vast cosmos.
Paradise Lost in Plain and Simple English (A Modern Translation and the Original Version)
Author: BookCaps
Publisher: BookCaps Study Guides
ISBN: 1621072126
Category : Fiction
Languages : en
Pages : 1596
Book Description
John Milton put a twist on the story of Adam and Eve--in the process he created what some have called one of the greatest literary works in the English Language. It has inspired music, art, film, and even video games. But it's hundreds of years old and reading it today sometimes is a little tough. BookCaps is here to help! BookCaps puts a fresh spin on Milton’s classic by using language modern readers won't struggle to make sense of. The original English text is also presented in the book, along with a comparable version of both text. We all need refreshers every now and then. Whether you are a student trying to cram for that big final, or someone just trying to understand a book more, BookCapsTM can help. We are a small, but growing company, and are adding titles every month.
Publisher: BookCaps Study Guides
ISBN: 1621072126
Category : Fiction
Languages : en
Pages : 1596
Book Description
John Milton put a twist on the story of Adam and Eve--in the process he created what some have called one of the greatest literary works in the English Language. It has inspired music, art, film, and even video games. But it's hundreds of years old and reading it today sometimes is a little tough. BookCaps is here to help! BookCaps puts a fresh spin on Milton’s classic by using language modern readers won't struggle to make sense of. The original English text is also presented in the book, along with a comparable version of both text. We all need refreshers every now and then. Whether you are a student trying to cram for that big final, or someone just trying to understand a book more, BookCapsTM can help. We are a small, but growing company, and are adding titles every month.
Other Worlds
Author: Christopher G. White
Publisher: Harvard University Press
ISBN: 0674984293
Category : Religion
Languages : en
Pages : 385
Book Description
Christopher White points to ways that both spiritual practices and scientific speculation about multiverses and invisible dimensions are efforts to peer into the hidden elements and even existential meaning of the universe. Creatively appropriated, these ideas can restore a spiritual sense that the world is greater than anything our eyes can see.
Publisher: Harvard University Press
ISBN: 0674984293
Category : Religion
Languages : en
Pages : 385
Book Description
Christopher White points to ways that both spiritual practices and scientific speculation about multiverses and invisible dimensions are efforts to peer into the hidden elements and even existential meaning of the universe. Creatively appropriated, these ideas can restore a spiritual sense that the world is greater than anything our eyes can see.
Between the World and Me
Author: Ta-Nehisi Coates
Publisher: One World
ISBN: 0679645985
Category : Biography & Autobiography
Languages : en
Pages : 163
Book Description
#1 NEW YORK TIMES BESTSELLER • NATIONAL BOOK AWARD WINNER • NAMED ONE OF TIME’S TEN BEST NONFICTION BOOKS OF THE DECADE • PULITZER PRIZE FINALIST • NATIONAL BOOK CRITICS CIRCLE AWARD FINALIST • ONE OF OPRAH’S “BOOKS THAT HELP ME THROUGH” • NOW AN HBO ORIGINAL SPECIAL EVENT Hailed by Toni Morrison as “required reading,” a bold and personal literary exploration of America’s racial history by “the most important essayist in a generation and a writer who changed the national political conversation about race” (Rolling Stone) NAMED ONE OF THE MOST INFLUENTIAL BOOKS OF THE DECADE BY CNN • NAMED ONE OF PASTE’S BEST MEMOIRS OF THE DECADE • NAMED ONE OF THE TEN BEST BOOKS OF THE YEAR BY The New York Times Book Review • O: The Oprah Magazine • The Washington Post • People • Entertainment Weekly • Vogue • Los Angeles Times • San Francisco Chronicle • Chicago Tribune • New York • Newsday • Library Journal • Publishers Weekly In a profound work that pivots from the biggest questions about American history and ideals to the most intimate concerns of a father for his son, Ta-Nehisi Coates offers a powerful new framework for understanding our nation’s history and current crisis. Americans have built an empire on the idea of “race,” a falsehood that damages us all but falls most heavily on the bodies of black women and men—bodies exploited through slavery and segregation, and, today, threatened, locked up, and murdered out of all proportion. What is it like to inhabit a black body and find a way to live within it? And how can we all honestly reckon with this fraught history and free ourselves from its burden? Between the World and Me is Ta-Nehisi Coates’s attempt to answer these questions in a letter to his adolescent son. Coates shares with his son—and readers—the story of his awakening to the truth about his place in the world through a series of revelatory experiences, from Howard University to Civil War battlefields, from the South Side of Chicago to Paris, from his childhood home to the living rooms of mothers whose children’s lives were taken as American plunder. Beautifully woven from personal narrative, reimagined history, and fresh, emotionally charged reportage, Between the World and Me clearly illuminates the past, bracingly confronts our present, and offers a transcendent vision for a way forward.
Publisher: One World
ISBN: 0679645985
Category : Biography & Autobiography
Languages : en
Pages : 163
Book Description
#1 NEW YORK TIMES BESTSELLER • NATIONAL BOOK AWARD WINNER • NAMED ONE OF TIME’S TEN BEST NONFICTION BOOKS OF THE DECADE • PULITZER PRIZE FINALIST • NATIONAL BOOK CRITICS CIRCLE AWARD FINALIST • ONE OF OPRAH’S “BOOKS THAT HELP ME THROUGH” • NOW AN HBO ORIGINAL SPECIAL EVENT Hailed by Toni Morrison as “required reading,” a bold and personal literary exploration of America’s racial history by “the most important essayist in a generation and a writer who changed the national political conversation about race” (Rolling Stone) NAMED ONE OF THE MOST INFLUENTIAL BOOKS OF THE DECADE BY CNN • NAMED ONE OF PASTE’S BEST MEMOIRS OF THE DECADE • NAMED ONE OF THE TEN BEST BOOKS OF THE YEAR BY The New York Times Book Review • O: The Oprah Magazine • The Washington Post • People • Entertainment Weekly • Vogue • Los Angeles Times • San Francisco Chronicle • Chicago Tribune • New York • Newsday • Library Journal • Publishers Weekly In a profound work that pivots from the biggest questions about American history and ideals to the most intimate concerns of a father for his son, Ta-Nehisi Coates offers a powerful new framework for understanding our nation’s history and current crisis. Americans have built an empire on the idea of “race,” a falsehood that damages us all but falls most heavily on the bodies of black women and men—bodies exploited through slavery and segregation, and, today, threatened, locked up, and murdered out of all proportion. What is it like to inhabit a black body and find a way to live within it? And how can we all honestly reckon with this fraught history and free ourselves from its burden? Between the World and Me is Ta-Nehisi Coates’s attempt to answer these questions in a letter to his adolescent son. Coates shares with his son—and readers—the story of his awakening to the truth about his place in the world through a series of revelatory experiences, from Howard University to Civil War battlefields, from the South Side of Chicago to Paris, from his childhood home to the living rooms of mothers whose children’s lives were taken as American plunder. Beautifully woven from personal narrative, reimagined history, and fresh, emotionally charged reportage, Between the World and Me clearly illuminates the past, bracingly confronts our present, and offers a transcendent vision for a way forward.
Einstein's Dreams
Author: Alan Lightman
Publisher: Vintage
ISBN: 0307789748
Category : Fiction
Languages : en
Pages : 146
Book Description
NATIONAL BESTSELLER • A modern classic explores the connections between science and art, the process of creativity, and ultimately the fragility of human existence. “A magical, metaphysical realm ... Captivating, enchanting, delightful.” —The New York Times Einstein’s Dreams is a fictional collage of stories dreamed by Albert Einstein in 1905, about time, relativity and physics. As the defiant but sensitive young genius is creating his theory of relativity, a new conception of time, he imagines many possible worlds. In one, time is circular, so that people are fated to repeat triumphs and failures over and over. In another, there is a place where time stands still, visited by lovers and parents clinging to their children. In another, time is a nightingale, sometimes trapped by a bell jar. Now translated into thirty languages, Einstein’s Dreams has inspired playwrights, dancers, musicians, and painters all over the world. In poetic vignettes, it explores the connections between science and art, the process of creativity, and ultimately the fragility of human existence.
Publisher: Vintage
ISBN: 0307789748
Category : Fiction
Languages : en
Pages : 146
Book Description
NATIONAL BESTSELLER • A modern classic explores the connections between science and art, the process of creativity, and ultimately the fragility of human existence. “A magical, metaphysical realm ... Captivating, enchanting, delightful.” —The New York Times Einstein’s Dreams is a fictional collage of stories dreamed by Albert Einstein in 1905, about time, relativity and physics. As the defiant but sensitive young genius is creating his theory of relativity, a new conception of time, he imagines many possible worlds. In one, time is circular, so that people are fated to repeat triumphs and failures over and over. In another, there is a place where time stands still, visited by lovers and parents clinging to their children. In another, time is a nightingale, sometimes trapped by a bell jar. Now translated into thirty languages, Einstein’s Dreams has inspired playwrights, dancers, musicians, and painters all over the world. In poetic vignettes, it explores the connections between science and art, the process of creativity, and ultimately the fragility of human existence.
Nod
Author: Adrian Barnes
Publisher: Titan Books (US, CA)
ISBN: 1783298235
Category : Fiction
Languages : en
Pages : 199
Book Description
A disturbing literary dystopian science fiction debut set in a near-future Vancouver during a deadly insomnia pandemic for fans of The Leftovers Dawn breaks over Vancouver and no one in the world has slept the night before, or almost no one. A few people, perhaps one in ten thousand, can still sleep, and they’ve all shared the same golden dream. After six days of absolute sleep deprivation, psychosis will set in. After four weeks, the body will die. In the interim, panic ensues and a bizarre new world arises in which those previously on the fringes of society take the lead. Paul, a writer, continues to sleep while his partner Tanya disintegrates before his eyes, and the new world swallows the old one whole.
Publisher: Titan Books (US, CA)
ISBN: 1783298235
Category : Fiction
Languages : en
Pages : 199
Book Description
A disturbing literary dystopian science fiction debut set in a near-future Vancouver during a deadly insomnia pandemic for fans of The Leftovers Dawn breaks over Vancouver and no one in the world has slept the night before, or almost no one. A few people, perhaps one in ten thousand, can still sleep, and they’ve all shared the same golden dream. After six days of absolute sleep deprivation, psychosis will set in. After four weeks, the body will die. In the interim, panic ensues and a bizarre new world arises in which those previously on the fringes of society take the lead. Paul, a writer, continues to sleep while his partner Tanya disintegrates before his eyes, and the new world swallows the old one whole.
The Codebreakers
Author: David Kahn
Publisher: Simon and Schuster
ISBN: 1439103550
Category : History
Languages : en
Pages : 1326
Book Description
The magnificent, unrivaled history of codes and ciphers -- how they're made, how they're broken, and the many and fascinating roles they've played since the dawn of civilization in war, business, diplomacy, and espionage -- updated with a new chapter on computer cryptography and the Ultra secret. Man has created codes to keep secrets and has broken codes to learn those secrets since the time of the Pharaohs. For 4,000 years, fierce battles have been waged between codemakers and codebreakers, and the story of these battles is civilization's secret history, the hidden account of how wars were won and lost, diplomatic intrigues foiled, business secrets stolen, governments ruined, computers hacked. From the XYZ Affair to the Dreyfus Affair, from the Gallic War to the Persian Gulf, from Druidic runes and the kaballah to outer space, from the Zimmermann telegram to Enigma to the Manhattan Project, codebreaking has shaped the course of human events to an extent beyond any easy reckoning. Once a government monopoly, cryptology today touches everybody. It secures the Internet, keeps e-mail private, maintains the integrity of cash machine transactions, and scrambles TV signals on unpaid-for channels. David Kahn's The Codebreakers takes the measure of what codes and codebreaking have meant in human history in a single comprehensive account, astonishing in its scope and enthralling in its execution. Hailed upon first publication as a book likely to become the definitive work of its kind, The Codebreakers has more than lived up to that prediction: it remains unsurpassed. With a brilliant new chapter that makes use of previously classified documents to bring the book thoroughly up to date, and to explore the myriad ways computer codes and their hackers are changing all of our lives, The Codebreakers is the skeleton key to a thousand thrilling true stories of intrigue, mystery, and adventure. It is a masterpiece of the historian's art.
Publisher: Simon and Schuster
ISBN: 1439103550
Category : History
Languages : en
Pages : 1326
Book Description
The magnificent, unrivaled history of codes and ciphers -- how they're made, how they're broken, and the many and fascinating roles they've played since the dawn of civilization in war, business, diplomacy, and espionage -- updated with a new chapter on computer cryptography and the Ultra secret. Man has created codes to keep secrets and has broken codes to learn those secrets since the time of the Pharaohs. For 4,000 years, fierce battles have been waged between codemakers and codebreakers, and the story of these battles is civilization's secret history, the hidden account of how wars were won and lost, diplomatic intrigues foiled, business secrets stolen, governments ruined, computers hacked. From the XYZ Affair to the Dreyfus Affair, from the Gallic War to the Persian Gulf, from Druidic runes and the kaballah to outer space, from the Zimmermann telegram to Enigma to the Manhattan Project, codebreaking has shaped the course of human events to an extent beyond any easy reckoning. Once a government monopoly, cryptology today touches everybody. It secures the Internet, keeps e-mail private, maintains the integrity of cash machine transactions, and scrambles TV signals on unpaid-for channels. David Kahn's The Codebreakers takes the measure of what codes and codebreaking have meant in human history in a single comprehensive account, astonishing in its scope and enthralling in its execution. Hailed upon first publication as a book likely to become the definitive work of its kind, The Codebreakers has more than lived up to that prediction: it remains unsurpassed. With a brilliant new chapter that makes use of previously classified documents to bring the book thoroughly up to date, and to explore the myriad ways computer codes and their hackers are changing all of our lives, The Codebreakers is the skeleton key to a thousand thrilling true stories of intrigue, mystery, and adventure. It is a masterpiece of the historian's art.
Imagining Mars
Author: Robert Crossley
Publisher: Wesleyan University Press
ISBN: 0819571059
Category : Literary Criticism
Languages : en
Pages : 386
Book Description
Mars in the human imagination from the invention of the telescope to the present For centuries, the planet Mars has captivated astronomers and inspired writers of all genres. Whether imagined as the symbol of the bloody god of war, the cradle of an alien species, or a possible new home for human civilization, our closest planetary neighbor has played a central role in how we think about ourselves in the universe. From Galileo to Kim Stanley Robinson, Robert Crossley traces the history of our fascination with the red planet as it has evolved in literature both fictional and scientific. Crossley focuses specifically on the interplay between scientific discovery and literary invention, exploring how writers throughout the ages have tried to assimilate or resist new planetary knowledge. Covering texts from the 1600s to the present, from the obscure to the classic, Crossley shows how writing about Mars has reflected the desires and social controversies of each era. This astute and elegant study is perfect for science fiction fans and readers of popular science.
Publisher: Wesleyan University Press
ISBN: 0819571059
Category : Literary Criticism
Languages : en
Pages : 386
Book Description
Mars in the human imagination from the invention of the telescope to the present For centuries, the planet Mars has captivated astronomers and inspired writers of all genres. Whether imagined as the symbol of the bloody god of war, the cradle of an alien species, or a possible new home for human civilization, our closest planetary neighbor has played a central role in how we think about ourselves in the universe. From Galileo to Kim Stanley Robinson, Robert Crossley traces the history of our fascination with the red planet as it has evolved in literature both fictional and scientific. Crossley focuses specifically on the interplay between scientific discovery and literary invention, exploring how writers throughout the ages have tried to assimilate or resist new planetary knowledge. Covering texts from the 1600s to the present, from the obscure to the classic, Crossley shows how writing about Mars has reflected the desires and social controversies of each era. This astute and elegant study is perfect for science fiction fans and readers of popular science.