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How do we know what knowledge is? In his 1963 article, "Is Justified True Belief Knowledge?", American philosopher Edmund Gettier radically challenged the accepted definition of knowledge itself. Greek philosopher Plato, discussing knowledge well over 2,000 years ago, defined it as "justified true belief". But in two ingenious cases, Gettier demonstrates that somebody's justified belief can be true because of nothing more than luck.

Written more than 2,000 years ago, this earliest surviving work on how to wage war successfully - and above all, rationally - argues that winning requires careful advance planning, better sources of information than your opponent, and a strategy that's flexible enough to adapt to changing conditions. Sun Tzu concludes that in the end, a decision not to take military action can be every bit as sensible and effective as being able to triumph on the battlefield.

Friedman did not just demonstrate that monetary policy plays a vital role in broader economic stability. He also argued that economists got their monetary policy wrong in the 1950s and 1960s by misunderstanding the relationship between inflation and unemployment. In Friedman's view, previous generations of economists had no justification for believing that governments could permanently decrease unemployment by allowing inflation - and vice versa.

Albert Hourani's 1991 work, A History of the Arab Peoples, is unsurpassed as an overview of Arab history, from the rise of Islam to the late 20th century. Going far beyond the political history that had generally characterized previous examinations, Hourani integrates a wide range of scholarship to provide a deep analysis of social, cultural, and economic structures. His interest in the everyday lives of Arab people and his desire to understand what united - rather than divided - many different nationalities gives listeners a new and vital perspective on the region.

Published in 1925, The Gift is one of French sociologist Marcel Mauss's few non-collaborative works. In it, he elevates what might appear to be a simple gift from the status of innocent object to something that has the capacity to motivate people and define social relationships. The Gift analyzes cultures across the world and across time, with the way gifts are given and received working as a guide to understanding the rules and traditions of many different societies.

Gordon W. Allport's 1954 book The Nature of Prejudice helped mold the ways in which psychologists investigate prejudice. But the American's work reached further than that, also helping to shape society as a whole and making a substantial contribution to the US Civil Rights Movement, as well as to the country's anti-discrimination and anti-segregation laws of the 1950s and 1960s.

In her 1983 book, Natalie Zemon Davis, a historian with a special interest in gender studies, examines the role of Martin Guerre's wife Bertrande in their fraudulent marriage. Davis argues that Bertrande plays a key part in the deceit and readily goes along with it. Her book helped spur a shift in the way historians viewed past events generally, and the role of women in a period where documentary evidence was lacking. She daringly used her imagination to reinterpret the story.

Seventeenth-century French writer René Descartes, one of the fathers of philosophy, imagined the mind and body as two separate entities that combine to form a human being. This concept came to be called "mind-body dualism." Ryle set about ridiculing Descartes's idea of, as he put it, a "ghost in the machine" stating that it was "entirely false, and false not in detail but in principle...not merely an assemblage of particular mistakes. It is one big mistake and a mistake of a special kind."

On the Genealogy of Morality was written in 1887 when Friedrich Nietzsche was at the height of his powers as a philosopher and master of German prose writing. Here, he criticizes the idea that there is just one conception of moral goodness, dissecting the contemporary practice of morality and looking at it from a historical viewpoint. Rather than following a metaphysical or religious approach, Nietzsche adopts a naturalistic framework, which is grounded in history and natural science, to understand our concepts of good and evil in the Christianized Western world.

Linguistic structuralism studies the meaning of language based not just on definitions, but also on the relationships of words and sounds to each other. Lévi-Strauss's insight was to see that this concept of structuralism in linguistics could be applied to anthropology as well. He saw that while some cultures are very different from others, they all seem to have certain internal structural relationships in common. By tracing these structures across cultures, he tried to answer nothing less than the eternal question: "What is man?"

The ideas set out by American international relations expert Robert O. Keohane in 1984's After Hegemony have had a huge impact on policy debates over the last three decades, both in political circles and in academia. Hegemony means the social, cultural, ideological or economic influence of one dominant group. Contemplating a post-Cold War world half a decade before the Berlin Wall fell, Keohane asks if international cooperation can survive in the absence of a single superpower.

Since it was first published in 1973, A Random Walk Down Wall Street has been a highly influential best seller. Burton G. Malkiel demolishes the idea that investment "experts" can predict stock price changes and thereby "beat the market." With all available information that could affect the value of a company's shares known almost instantly to all investors, Malkiel says, shares quickly find the price that reflects that information. This is known as the efficient market hypothesis.

James E. Lovelock says the Earth (Gaia) is a superorganism, made up of all living things, interacting with the air, the oceans, and the surface rocks of the planet. He suggests Gaia takes an active role in keeping the planet safe for life, with automatic feedback mechanisms making adjustments as needed. Lovelock describes feedback mechanisms that are widely accepted. It is the implication that Gaia is somehow self-aware that is controversial.

De Beauvoir's book charted the oppression of "the second sex" in terms never before seen in the academic world. Her most startling theory became a rallying cry for the feminist movement: "One is not born, but rather becomes, a woman." She argued that gender identity was shaped by upbringing in a world ruled by men. A leading light in the existentialist movement, de Beauvoir applied the radical philosophy of personal choice and freedom to argue that women were subjugated in every area of life.

Rachel Carson worked at the US Bureau of Fisheries for 15 years while developing a writing career at the same time. Her first book, 1941's Under the Sea Wind, became a best seller. But it was eclipsed by 1962's Silent Spring, one of the first books ever to highlight environmentalist issues. Carson focuses on the negative, widespread, and long-lasting effects of human activity on the environment, and illustrates this through one case study - the use of chemical pesticides in agriculture.

Elizabeth Loftus's 1979 work, Eyewitness Testimony, explains why people sometimes remember events inaccurately, and how this simple fact has a profound impact on the criminal justice system. Eyewitness accounts, which are often used in criminal trials, can be very persuasive to both judges and juries. Yet these accounts are based on memories that are not always reliable, meaning that suspects may be misidentified or wrongfully convicted.

Winner of the Pulitzer Prize for fiction - and the first black woman to win the Nobel Prize in literature - novelist, orator, and outspoken public intellectual Toni Morrison is best known for her novels. In Playing in the Dark, however, she enters the realm of literary criticism. Morrison, an African American, draws attention to the often-overlooked significance of race in literature, demonstrating "the impact of racism on those who perpetuate it". Reading the racial language between the lines of classic American fiction, Morrison shows that literature is never raceless.

One of the most influential works of political theory ever written, The Federalist Papers collects 85 essays from 1787 and 1788, when the United States was a new country looking to find its way politically. Thomas Jefferson, author of the country's Declaration of Independence and a future US president, called the work "the best commentary on the principles of government which ever was written".

Nineteenth-century American politician John C. Calhoun was unashamedly pro-slavery. So it may seem odd that A Disquisition on Government (1850), written in part to protect that practice, is so respected today. But South Carolina-born Calhoun was undoubtedly a great political thinker. Calhoun - who served his country as senator, vice president, secretary of war, and secretary of state - believed that "majority rule" inevitably led to abuse of power.

Reconstruction had the potential to make good on the promise of America's founders, bringing freedom and equality to all. Yet this promise was undermined by defiant Southern whites determined to protect their own privilege. Earlier interpretations of this period often blamed the failures of Reconstruction on black people. But Foner's analysis concluded that Reconstruction was an overall failure because whites prevented African Americans from becoming equal citizens.