Books published by Princeton University Press

How an event once considered the greatest of all political dangers came to be seen as a solution to all social problemsPolitical thinkers from Plato to John Adams saw revolutions as a grave threat to society and advocated for a constitution that prevented them by balancing social interests and forms of government. The Revolution to Come traces how evolving conceptions of history ushered in a faith in the power of revolution to create more just and reasonable societies.Taking readers from Greek antiquity to Leninist Russia, Dan Edelstein describes how classical philosophers viewed history as chaotic and directionless, and sought to keep historical change—especially revolutions—at bay. This conception prevailed until the eighteenth century, when Enlightenment thinkers conceived of history as a form of progress and of revolution as its catalyst. These ideas were put to the test during the French Revolution and came to define revolutions well into the twentieth century. Edelstein demonstrates how the coming of the revolution leaves societies divided over its goals, giving rise to new forms of violence in which rivals are targeted as counterrevolutionaries.A panoramic work of intellectual history, The Revolution to Come challenges us to reflect on the aims and consequences of revolution and to balance the value of stability over the hope for change in our own moment of fear and upheaval.

A comprehensive history of the women architects who left their enduring mark on American ModernismIn the decades preceding World War II, professional architecture schools enrolled increasing numbers of women, but career success did not come easily. Women Architects at Work tells the stories of the resilient and resourceful women who surmounted barriers of sexism, racism, and classism to take on crucial roles in the establishment and growth of Modernism across the United States.Mary Anne Hunting and Kevin D. Murphy describe how the Cambridge School of Architecture and Landscape Architecture in Massachusetts evolved for the professional education of women between 1916 and 1942. While alumnae such as Eleanor Agnes Raymond, Victorine du Pont Homsey, and Sarah Pillsbury Harkness achieved some notoriety, others like Elizabeth-Ann Campbell Knapp and Louisa Vaughan Conrad have been largely absent from histories of Modernism. Hunting and Murphy describe how these innovative practitioners capitalized on social, educational, and professional ties to achieve success and used architecture to address social concerns, including how modernist ideas could engage with community and the environment. Some joined women-led architectural firms while others partnered with men or contributed to Modernism as retailers of household furnishings, writers and educators, photographers and designers, or fine artists.With stunning illustrations, Women Architects at Work offers new histories of recognized figures while recovering the stories of previously unsung women, all of whom contributed to the modernization of American architecture and design.

Why efforts to moderate harmful content on social media fail to stop extremistsContent moderation on social media has become one of the most daunting challenges of our time. Nowhere is the need for action more urgent than in the fight against terrorism and extremism. Yet despite mass content takedowns, account suspensions, and mounting pressure on technology companies to do more, hate thrives online. Safe Havens for Hate looks at how content moderation shapes the tactics of harmful content producers on a wide range of social media platforms. Drawing on a wealth of original data on more than a hundred militant and hate organizations around the world, Tamar Mitts shows how differing moderation standards across platforms create safe havens that allow these actors to organize, launch campaigns, and mobilize supporters. She reveals how the structure of the information environment shapes the cross-platform activity of extremist organizations and movements such as the Islamic State, the Proud Boys, the Oath Keepers, and QAnon, and highlights the need to consider the online ecosystem, not just individual platforms, when developing strategies to combat extremism. Taking readers to the frontlines of the digital battleground where dangerous organizations operate, Safe Havens for Hate sheds critical light on how governments and technology companies grapple with the tension between censorship and free speech when faced with violence, hate, and extremism.

A provocative new theory of "the economy," its history, and its politics that better unites history and economics What is the economy, really? Is it a "market sector," a "general equilibrium," the "gross domestic product"? Economics today has become so preoccupied with methods that economists risk losing sight of the economy itself. Meanwhile, other disciplines, although often intent on criticizing the methods of economics, have failed to articulate an alternative vision of the economy. Before the ascent of postwar neoclassical economics, fierce debates raged, as many different visions of the economy circulated and competed with one another. In The Real Economy, Jonathan Levy returns to the spirit of this earlier era, which, in all its contentiousness, gave birth to the discipline of economics. Drawing inspiration particularly from Thorstein Veblen and John Maynard Keynes, Levy proposes a theory of the economy that is open to rich empirical and historical scrutiny, covering topics that include the emergence of capitalism, the notion of radical uncertainty, the meaning of demand, the primal desire for money, the history of corporations, and contemporary globalization. Writing for anyone interested in the study of the economy, Levy provides an invaluable provocation for a broader debate in the social sciences and humanities concerning what "the economy" is.

An introduction to the state-of-the-art in the study of Kähler groupsThis book gives an authoritative and up-to-date introduction to the study of fundamental groups of compact Kähler manifolds, known as Kähler groups. Approaching the subject from the perspective of a geometric group theorist, Pierre Py equips readers with the necessary background in both geometric group theory and Kähler geometry, covering topics such as the actions of Kähler groups on spaces of nonpositive curvature, the large-scale geometry of infinite covering spaces of compact Kähler manifolds, and the topology of level sets of pluriharmonic functions. Presenting the most important results from the past three decades, the book provides graduate students and researchers with detailed original proofs of several central theorems, including Gromov and Schoen's description of Kähler group actions on trees; the study of solvable quotients of Kähler groups following the works of Arapura, Beauville, Campana, Delzant, and Nori; and Napier and Ramachandran's work characterizing covering spaces of compact Kähler manifolds having many ends. It also describes without proof many of the recent breakthroughs in the field. Lectures on Kähler Groups also gives, in eight appendixes, detailed introductions to such topics as the study of ends of groups and spaces, groups acting on trees and Hilbert spaces, potential theory, and L2 cohomology on Riemannian manifolds.

A wide-ranging account of how birds spend the quiet half of their livesBirds at Rest is the first book to give a full picture of how birds rest, roost, and sleep, a vital part of their lives. It features new science that can measure what is happening in a bird's brain over the course of a night or when it has flown to another hemisphere, as well as still-valuable observations by legendary naturalists such as John James Audubon, Alfred Russel Wallace, and Theodore Roosevelt. Much of what they saw and what ornithologists are studying today can be observed and enjoyed by any birder. From the poles to the tropics, how, when, and where birds sleep reflect the ecology and behavior of each species, as well as their evolution from dinosaur ancestors. Some sleep briefly, their brain half awake, others spend long cold nights in torpor, a few can sleep while flying. Their roosting habits are also varied. Most birds sleep alone, some in pairs or families, while others in flocks of millions. Birds at Rest explains how each strategy works over the course of a season, a year, or a lifetime by providing protection, mating opportunities, information about food, and other survival benefits. With evocative drawings by artist and illustrator Margaret La Farge, Birds at Rest discusses how environmental challenges such as artificial lights and noise, invasive species, and climate change are disrupting avian sleep and proposes solutions to ensure that birds get the rest they need.

An anthology of original essays that examine white supremacy around the globe through the lens of anthropologyWhite supremacy has shaped cultural anthropology from its inception, yet the discipline also offers powerful tools for understanding how this corrosive force structures societies around the world. The Anthropology of White Supremacy explores how this phenomenon works around the globe and within anthropology itself. Gathering original essays from a diverse, international group of anthropologists, this collection illustrates that white supremacy, far from being only a fringe belief of white nationalists and fascists, is a core mainstream ideology. The book includes essays about many countries, including Brazil, Mexico, Nigeria, Norway, Senegal, South Africa, and the United States, and takes up such topics as American advertising, the Belgian Congo, South Asian philosophies, police cadets, U.S. immigration courts, Guantánamo memoirs, Palestinian feminism, Hollywood paparazzi, and how Indigenous anthropologists can counter the damage of settler colonialism. The result reveals not only how anthropology can help us to better comprehend white supremacy, but also how the discipline can help us begin to dismantle it. With contributors by Omolade Adunbi, Samar Al-Bulushi, Aisha M. Beliso-De Jesús, Michael Blakey, Mitzi Uehara Carter, Subhadra Mitra Channa, Celina de Sa, Vanessa Diaz, Britt Halvorson, Faye Harrison, Sarah Ihmoud, Anthony R. Jerry, Darryl Li, Kristín Loftsdóttir, Christopher Loperena, Keisha-Khan Y. Perry, Jemima Pierre, Jean Muteba Rahier, Laurence Ralph, Renya K. Ramirez, Junaid Rana, Joshua Reno, Jonathan Rosa, Shalini Shankar, and Maria Styve.

An anthology of original essays that examine white supremacy around the globe through the lens of anthropologyWhite supremacy has shaped cultural anthropology from its inception, yet the discipline also offers powerful tools for understanding how this corrosive force structures societies around the world. The Anthropology of White Supremacy explores how this phenomenon works around the globe and within anthropology itself. Gathering original essays from a diverse, international group of anthropologists, this collection illustrates that white supremacy, far from being only a fringe belief of white nationalists and fascists, is a core mainstream ideology. The book includes essays about many countries, including Brazil, Mexico, Nigeria, Norway, Senegal, South Africa, and the United States, and takes up such topics as American advertising, the Belgian Congo, South Asian philosophies, police cadets, U.S. immigration courts, Guantánamo memoirs, Palestinian feminism, Hollywood paparazzi, and how Indigenous anthropologists can counter the damage of settler colonialism. The result reveals not only how anthropology can help us to better comprehend white supremacy, but also how the discipline can help us begin to dismantle it. With contributors by Omolade Adunbi, Samar Al-Bulushi, Aisha M. Beliso-De Jesús, Michael Blakey, Mitzi Uehara Carter, Subhadra Mitra Channa, Celina de Sa, Vanessa Diaz, Britt Halvorson, Faye Harrison, Sarah Ihmoud, Anthony R. Jerry, Darryl Li, Kristín Loftsdóttir, Christopher Loperena, Keisha-Khan Y. Perry, Jemima Pierre, Jean Muteba Rahier, Laurence Ralph, Renya K. Ramirez, Junaid Rana, Joshua Reno, Jonathan Rosa, Shalini Shankar, and Maria Styve.

How the creation of money and monetary policy can be more democraticThe power to create money is foundational to the state. In the United States, that power has been largely delegated to private banks governed by an independent central bank. Putting monetary policy in the hands of a set of insulated, nonelected experts has fueled the popular rejection of expertise as well as a widespread dissatisfaction with democratically elected officials. In Our Money, Leah Rose Ely Downey makes a principled case against central bank independence by both challenging the economic theory behind it and developing a democratic rationale for sustaining the power of the legislature to determine who can create money and on what terms. How states govern money creation has an impact on the capacity of the people and their elected officials to steer policy over time. In a healthy democracy, Downey argues, the balance of power over money creation matters. Downey applies and develops democratic theory through an exploration of monetary policy. In so doing, she develops a novel theory of independent agencies in the context of democratic government, arguing that states can employ expertise without being ruled by experts. Downey argues that it is through iterative governance, the legislature knowing and regularly showing its power over policy, that the people can retain their democratic power to guide policy in the modern state. As for contemporary macroeconomic arguments in defense of central bank independence, Downey suggests that the purported economic benefits do not outweigh the democratic costs.

An expanded and updated new edition of a concise introduction to climate system dynamicsClimate Dynamics provides an essential foundation in the physical understanding of Earth's climate system. Assuming no previous introduction to the climate system, the book is designed for all science, math, and engineering students at the advanced undergraduate and beginning graduate levels. This second edition includes updated and expanded information on hydrology, the cryosphere, observed contemporary climate change, and climate prediction. In addition, the illustrations are expanded and now in full color. The first section of the book provides a description of the climate system based on current observations of the mean climate state and its variability. The second section develops a quantitative understanding of the processes that determine the climate state-radiation, heat balances, and the basics of fluid dynamics applied to the atmosphere, oceans, and cryosphere. The third and final section focuses on observed contemporary climate change and prediction. Presents a physically based, quantitative understanding of the climate system and climate changeEmphasizes fundamental observations and understandingFeatures end-of-chapter exercises and full-color illustrationsAn online illustration package and solutions manual for professors is available

A beautifully illustrated exploration of the famed palace-city that was once the heart of Islamic SpainMadinat al-Zahra, a tenth-century palace-city on the western outskirts of Córdoba, Spain, and a UNESCO World Heritage Site, stands as a testament to the multicultural environment fostered by its founders. Built by ?Abd al-Rahman III (r. 929-961), a member of the Umayyad dynasty and the first caliph of al-Andalus, the city symbolized the caliph's aspiration to rule over the Fatimid Caliphs of Ifriqiya in North Africa and the Abbasid Caliphs in Baghdad and was the site of vast cultural and artistic creation. The companion volume to an exhibition at New York University's Institute for the Study of the Ancient World, this book showcases the complex visual vocabulary of Madinat al-Zahra, which derived from diverse cultural traditions and was translated into new and unique architectural and material cultures. Thematic essays examine the history of the Islamic Caliphate in Muslim Iberia (al-Andalus), the cultural and artistic traditions of the time, and the resulting multicultural society, while shorter, object-focused chapters explore the variety of works found at the ancient site-from jewelry and ceramics to medical texts and epigraphic materials. Contributors include Nour Ammari, Maribel Fierro Bello, Gerrit Bos, Roberta Casagrande-Kim, Patrice Cressier, Miquel Forcada, Teresa Garulo, Fabian Käs, Ana Labarta, Eduardo Manzano Moreno, Antonia Martínez Núñez, Jorge Elices Ocón, Mariam Rosser-Owen, Irene Montilla Torres, Antonio Vallejo Triano, and Mercè Viladrich. Distributed for the Institute for the Study of the Ancient World at New York UniversityExhibition ScheduleInstitute for the Study of the Ancient World, New York UniversityOctober 30, 2024-March 2, 2025

How a field built on the intellectual labor and expertise of women erased them The academic field of international relations presents its own history as largely a project of elite white men. And yet women played a prominent role in the creation of this new cross-disciplinary field. In Erased, Patricia Owens shows that, since its beginnings in the early twentieth century, international relations relied on the intellectual labour of women and their expertise on such subjects as empire and colonial administration, anticolonial organising, non-Western powers, and international organisations. Indeed, women were among the leading international thinkers of the era, shaping the development of the field as scholars, journalists and public intellectuals-and as heterosexual spouses and intimate same-sex partners. Drawing on a wide range of archival sources, and weaving together personal, institutional and intellectual narratives, Owens documents key moments and locations in the effort to forge international relations as a separate academic discipline in Britain. She finds that women's ideas and influence were first marginalised and later devalued, ignored and erased. Examining the roles played by some of the most important women thinkers in the field, including Margery Perham, Merze Tate, Eileen Power, Margaret Cleeve, Coral Bell and Susan Strange, Owens traces the intellectual and institutional legacies of misogyny and racism. She argues that the creation of international relations was a highly gendered and racialised project that failed to understand plurality on a worldwide scale. Acknowledging this intellectual failure, and recovering the history of women in the field, points to possible sources for its renewal.

A multifaceted biography of a brilliant mathematician and iconoclastA mathematician unlike any other, John Horton Conway (1937-2020) possessed a rock star's charisma, a polymath's promiscuous curiosity, and a sly sense of humor. Conway found fame as a barefoot professor at Cambridge, where he discovered the Conway groups in mathematical symmetry and the aptly named surreal numbers. He also invented the cult classic Game of Life, a cellular automaton that demonstrates how simplicity generates complexity-and provides an analogy for mathematics and the entire universe. Moving to Princeton in 1987, Conway used ropes, dice, pennies, coat hangers, and the occasional Slinky to illustrate his winning imagination and share his nerdish delights. Genius at Play tells the story of this ambassador-at-large for the beauties and joys of mathematics, and at once lays bare Conway's personal and professional idiosyncrasies-it gives an intimate look into the mind of one of the twentieth century's most endearing and original intellectuals.

A panoramic narrative that places ancient Africa on the stage of world historyThis book brings together archaeological and linguistic evidence to provide a sweeping global history of ancient Africa, tracing how the continent played an important role in the technological, agricultural, and economic transitions of world civilization. Christopher Ehret takes readers from the close of the last Ice Age some ten thousand years ago, when a changing climate allowed for the transition from hunting and gathering to the cultivation of crops and raising of livestock, to the rise of kingdoms and empires in the first centuries of the common era. Ehret takes up the problem of how we discuss Africa in the context of global history, combining results of multiple disciplines. He sheds light on the rich history of technological innovation by African societies-from advances in ceramics to cotton weaving and iron smelting-highlighting the important contributions of women as inventors and innovators. He shows how Africa helped to usher in an age of agricultural exchange, exporting essential crops as well as new agricultural methods into other regions, and how African traders and merchants led a commercial revolution spanning diverse regions and cultures. Ehret lays out the deeply African foundations of ancient Egyptian culture, beliefs, and institutions and discusses early Christianity in Africa. A monumental achievement by one of today's eminent scholars, Ancient Africa offers vital new perspectives on our shared past, explaining why we need to reshape our historical frameworks for understanding the ancient world as a whole.

Why life's shortness-more than anything else-is what makes it meaningfulDeath might seem to render pointless all our attempts to create a meaningful life. Doesn't meaning require transcending death through an afterlife or in some other way? On the contrary, Dean Rickles argues, life without death would be like playing tennis without a net. Only constraints-and death is the ultimate constraint-make our actions meaningful. In Life Is Short, Rickles explains why the finiteness and shortness of life is the essence of its meaning-and how this insight is the key to making the most of the time we do have.Life Is Short explores how death limits our options and forces us to make choices that forge a life and give the world meaning. But people often live in a state of indecision, in a misguided attempt to keep their options open. This provisional way of living-always looking elsewhere, to the future, to other people, to other ways of being, and never committing to what one has or, alternatively, putting in the time and energy to achieve what one wants-is a big mistake, and Life Is Short tells readers how to avoid this trap.By reminding us how extraordinary it is that we have any time to live at all, Life Is Short challenges us to rethink what gives life meaning and how to make the most of it.

Why this holiday season is a great time to rethink the traditional turkey feastA turkey is the centerpiece of countless Thanksgiving and Christmas dinners. Yet most of us know almost nothing about today's specially bred, commercially produced birds. In this brief book, bestselling author Peter Singer tells their story-and, unfortunately, it's not a happy one. Along the way, he also offers a brief history of the turkey and its consumption, ridicules the annual U.S. presidential "pardon" of a Thanksgiving turkey, and introduces us to "a tremendously handsome, outgoing, and intelligent turkey" named Cornelius. Above all, Singer explains why we can improve our holiday tables-for turkeys, people, and the planet-by liberating ourselves from the traditional turkey feast. In its place, he encourages us to consider trying a vegetarian alternative-or just serving the side dishes that many people already enjoy far more than turkey. Complete with some delicious recipes for turkey-free holiday feasting, Consider the Turkey will make you reconsider what you serve for your next holiday meal-or even tomorrow's dinner.

On the 100th anniversary of T. S. Eliot's modernist masterpiece, a rich cultural history of The Waste Land's creation, explosive impact, and enduring influenceWhen T. S. Eliot published The Waste Land in 1922, it put the thirty-four-year-old author on a path to worldwide fame and the Nobel Prize. "e;But,"e; as Jed Rasula writes, "e;The Waste Land is not only a poem: it names an event, like a tornado or an earthquake. Its publication was a watershed, marking a before and after. It was a poem that unequivocally declared that the ancient art of poetry had become modern."e; In What the Thunder Said, Rasula tells the story of how The Waste Land changed poetry forever and how this cultural bombshell served as a harbinger of modernist revolution in all the arts, from abstraction in visual art to atonality in music.From its famous opening, "e;April is the cruellest month, breeding / Lilacs out of the dead land,"e; to its closing Sanskrit mantra, "e;Shantih shantih shantih,"e; The Waste Land combined singular imagery, experimental technique, and dense allusions, boldly fulfilling Ezra Pound's injunction to "e;make it new."e; What the Thunder Said traces the origins, reception, and enduring influence of the poem, from its roots in Wagnerism and French Symbolism to the way its strangely beguiling music continues to inspire readers. Along the way, we learn about Eliot's storied circle, including Wyndham Lewis, Virginia Woolf, and Bertrand Russell, and about poets like Mina Loy and Marianne Moore, whose innovations have proven as consequential as those of the "e;men of 1914."e;Filled with fresh insights and unfamiliar anecdotes, What the Thunder Said recovers the explosive force of the twentieth century's most influential poem.

Why the world's most resilient dictatorships are products of violent revolutionRevolution and Dictatorship explores why dictatorships born of social revolution-such as those in China, Cuba, Iran, the Soviet Union, and Vietnam-are extraordinarily durable, even in the face of economic crisis, large-scale policy failure, mass discontent, and intense external pressure. Few other modern autocracies have survived in the face of such extreme challenges. Drawing on comparative historical analysis, Steven Levitsky and Lucan Way argue that radical efforts to transform the social and geopolitical order trigger intense counterrevolutionary conflict, which initially threatens regime survival, but ultimately fosters the unity and state-building that supports authoritarianism.Although most revolutionary governments begin weak, they challenge powerful domestic and foreign actors, often bringing about civil or external wars. These counterrevolutionary wars pose a threat that can destroy new regimes, as in the cases of Afghanistan and Cambodia. Among regimes that survive, however, prolonged conflicts give rise to a cohesive ruling elite and a powerful and loyal coercive apparatus. This leads to the downfall of rival organizations and alternative centers of power, such as armies, churches, monarchies, and landowners, and helps to inoculate revolutionary regimes against elite defection, military coups, and mass protest-three principal sources of authoritarian breakdown.Looking at a range of revolutionary and nonrevolutionary regimes from across the globe, Revolution and Dictatorship shows why governments that emerge from violent conflict endure.

A history of the largely forgotten peasant revolution that swept central and eastern Europe after World War I-and how it changed the course of interwar politics and World War IIAs the First World War ended, villages across central and eastern Europe rose in revolt. Led in many places by a shadowy movement of army deserters, peasants attacked those whom they blamed for wartime abuses and long years of exploitation-large estate owners, officials, and merchants, who were often Jewish. At the same time, peasants tried to realize their rural visions of a reborn society, establishing local self-government or attempting to influence the new states that were being built atop the wreckage of the Austro-Hungarian and Russian empires. In The Last Peasant War, Jakub Beneš presents the first comprehensive history of this dramatic and largely forgotten revolution and traces its impact on interwar politics and the course of the Second World War. Sweeping large portions of the countryside between the Alps and the Urals from 1917 to 1921, this peasant revolution had momentous aftereffects, especially among Slavic peoples in the former lands of the Austro-Hungarian Empire. It enabled an unprecedented expansion of agrarian politics in the interwar period and provided a script for rural resistance that was later revived to resist Nazi occupation and to challenge Communist rule in east central Europe. By shifting historical focus from well-studied cities to the often-neglected countryside, The Last Peasant War reveals how the movements and ambitions of peasant villagers profoundly shaped Europe's most calamitous decades.

From acclaimed historian Michael Brenner, a mesmerizing portrait of Munich in the early years of Hitler's quest for powerIn the aftermath of Germany's defeat in World War I and the failed November Revolution of 1918-19, the conservative government of Bavaria identified Jews with left-wing radicalism. Munich became a hotbed of right-wing extremism, with synagogues under attack and Jews physically assaulted in the streets. It was here that Adolf Hitler established the Nazi movement and developed his antisemitic ideas. Michael Brenner provides a gripping account of how Bavaria's capital city became the testing ground for Nazism and the Final Solution.In an electrifying narrative that takes readers from Hitler's return to Munich following the armistice to his calamitous Beer Hall Putsch in 1923, Brenner demonstrates why the city's transformation is crucial for understanding the Nazi era and the tragedy of the Holocaust. Brenner describes how Hitler and his followers terrorized Munich's Jews and were aided by politicians, judges, police, and ordinary residents. He shows how the city's Jews responded to the antisemitic backlash in many different ways-by declaring their loyalty to the state, by avoiding public life, or by abandoning the city altogether.Drawing on a wealth of previously unknown documents, In Hitler's Munich reveals the untold story of how a once-cosmopolitan city became, in the words of Thomas Mann, "e;the city of Hitler."e;

An important look at a groundbreaking forty-year study of Darwin's finchesRenowned evolutionary biologists Peter and Rosemary Grant have produced landmark studies of the Galapagos finches first made famous by Charles Darwin. In How and Why Species Multiply, they offered a complete evolutionary history of Darwin's finches since their origin almost three million years ago. Now, in their richly illustrated new book, 40 Years of Evolution, the authors turn their attention to events taking place on a contemporary scale. By continuously tracking finch populations over a period of four decades, they uncover the causes and consequences of significant events leading to evolutionary changes in species.The authors used a vast and unparalleled range of ecological, behavioral, and genetic data-including song recordings, DNA analyses, and feeding and breeding behavior-to measure changes in finch populations on the small island of Daphne Major in the Galapagos archipelago. They find that natural selection happens repeatedly, that finches hybridize and exchange genes rarely, and that they compete for scarce food in times of drought, with the remarkable result that the finch populations today differ significantly in average beak size and shape from those of forty years ago. The authors' most spectacular discovery is the initiation and establishment of a new lineage that now behaves as a new species, differing from others in size, song, and other characteristics. The authors emphasize the immeasurable value of continuous long-term studies of natural populations and of critical opportunities for detecting and understanding rare but significant events.By following the fates of finches for several generations, 40 Years of Evolution offers unparalleled insights into ecological and evolutionary changes in natural environments.