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Why do we want to justify our decisions, even if they appear to be irrational? The answer lies in cognitive dissonance, the mental discomfort we experience when we hold two contradictory beliefs at the same time. In A Theory of Cognitive Dissonance, first published in 1957, American social psychologist Leon Festinger investigates the problem. Festinger puts forward the idea that we have developed mechanisms to try to deal with the stress brought on by cognitive dissonance.

Economist Amartya Sen's 1997 work Development as Freedom presents a "middle way" approach to how we should look at international development, based on the idea that its success or failure cannot be measured by income alone. Having grown up in India, Sen brings his own understanding of what poverty really means to the issue, arguing that above all, the process and goal of development must be human freedom. He backs up this idea through his concept of "capabilities."

What is the nature of our personal relationship with God? That's the core question of Fear and Trembling. If God asks us to do something we instinctively feel is unethical, must we obey and have faith that he knows best? Examining this question, Danish philosopher Kierkegaard considers the biblical story in which God commands Abraham to sacrifice his only son, Isaac. His unique reading of the story breaks new ground, focusing on our relationship with God at an individual level.

In her 1958 work, political theorist Hannah Arendt asks two fundamental questions: "Under what conditions do politics emerge?" and "Under what conditions can politics be eliminated?" In searching for answers she turns some long-established thinking on its head. Ancient political philosophers such as Plato and Aristotle believed that a life spent thinking was more important than an active life of labor, work, and action. But Arendt argues that political action is every bit as important as political thinking.

Traditionally, managers assumed people were lazy and would not work unless strictly controlled. McGregor, however, believed this form of management to be based on faulty assumptions about human nature, and felt that managers should reflect on their assumptions about what motivates people. He proposed they draw on research in psychology and the other social sciences to create working conditions that allow all employees to realize their full human potential.

Ferdinand de Saussure's Course in General Linguistics was first published in 1916, three years after his death. The book aims to explain Saussure's theory that all languages share an underlying structure, and that this underlying structure is the same, regardless of historical or cultural context. Although the book marked a break with the traditional, history-focused study of linguistics of the time, Saussure still uses examples based on more traditional studies.

Richard Dawkins' 1976 investigation into the science of evolution has become an enormous success, selling over a million copies in 25 languages. Drawing on the work of renowned evolutionary scientists, Dawkins makes his argument about evolution by focusing on the gene itself. While others considered evolution to occur at the level of the individual or the group, here Dawkins sees the process of natural selection differently.

Sigmund Freud was born in 1856, in Vienna, Austria, and died in London in 1939, but his reputation as "the father of psychoanalysis" lives on. The theories he introduced in his masterwork, The Interpretation of Dreams, revolutionized the treatment of mental illness in the late 19th century. Based on his success in using new techniques he had developed with his patients, and on conclusions he drew from analyzing his own dreams, Freud said that dreams offered a window into the workings of the unconscious mind.

Clifford Geertz's first collection of essays, The Interpretation of Cultures (1973), made him a leading voice of anthropology's "symbolic" movement, which believed scholars should read the signs and symbols of a culture from the perspective of its natives. Geertz's approach helped anthropology reinvent itself as a scientific discipline that is still relevant today, making him - in the words of one critic - "a true giant of social and cultural theory."

First published in 1948, Antonio Gramsci's Prison Notebooks is an important Marxist work that says we must understand societies both in terms of their economic relationships and their cultural beliefs. Gramsci wanted to explore why Russia had undergone a socialist revolution in 1917 while other European countries had not. So he developed the concept of hegemony, which is the idea that those who hold power in a society can maintain and use that power because of their own grip on cultural values and economic relationships.

Geneva-born thinker Jean-Jacques Rousseau's famous work of political philosophy from 1762 is based on a give-and-take theory of the relation between individual freedom and social order: the social contract that gives the work its name. Rousseau thinks about the issue by starting with what is known as the state of nature, a lawless condition where people are free to do what they like, governed only by their own instinctive sense of justice. People are free, but they are also vulnerable to chaos.

While previous scholars of international history had focused on "great men" and their achievements, Paul Kennedy focused on the interdependent relationship between military might and economic growth. In his 1987 work, The Rise and Fall of the Great Powers, he shows why countries that balance the economic and the military can become "great powers." Those that fail to do so, however, risk imperial overstretch and failure.

Published in 1938, Cyril Lionel Robert (C. L. R.) James' The Black Jacobins is the little-known story of the only successful slave revolution known in history. It was this 12-year struggle of the African slaves in the French colony of San Domingo that led to the establishment of the Republic of Haiti in 1804. The uprising was inspired by the ideals of the French Revolution that had begun in 1789, just two years before, and in this work James goes to great lengths to show the relationship between the two upheavals.

Nigerian novelist and professor Chinua Achebe was acutely conscious that Western views of Africa were inevitably the views of a culture that assumed itself superior. When confronted by what it took to be an inferior culture, the West identified itself as better - materially, intellectually, even spiritually. Achebe believed that even as original and subtle a work as Joseph Conrad's Heart of Darkness - a novel seen by many as a criticism of colonialism and one that Achebe admired stylistically - reflected these assumptions.

US-born historian of Europe Timothy Snyder first published Bloodlands: Europe Between Hitler and Stalin in 2010. In it, he argues that previous accounts of World War II have kept Nazi and Soviet crimes unduly separate, with much more attention paid to Adolf Hitler's atrocities than Joseph Stalin's. Snyder's view is that a definitive history of the period must depict the suffering of all of the conflict's victims.

Kenneth Waltz's Theory of International Politics created a "scientific revolution" in international relations, starting two major debates. In the 1980s it defined the controversy between the neorealists, who believed that competition between states was inevitable, and the neoliberals, who believed that states could cooperate with each other. As the debate wound down with the end of the Cold War in the 1990s, a second more fundamental debate began.

US psychologist Abraham Maslow's 1943 essay "A Theory of Human Motivation" established his idea of humanistic psychology as a "third force" in the field. He outlined a new approach to understanding the mind, saying humans are motivated by their need to satisfy a series of hierarchical needs, starting with the most essential first. He thought it important for the advancement of psychology to identify, group, and rank them in terms of priority.

First available in 1689, John Locke's Two Treatises of Government is considered one of the most important works ever written on the foundations of government. Published anonymously, it argues against the popular idea at the time that monarchs have a God-given right to rule. Instead Locke proposes that sovereignty - supreme authority - ultimately resides with the people.

Though written around 1513, more than 500 years ago, Italian diplomat Niccolò Machiavelli's The Prince is still both widely listened to and very influential. Listeners turn to it for its direct advice on the question of how to attain - and retain - power. Machiavelli's answer, in brief: Use any means necessary to make sure the state survives.

Politics as a Vocation examines what makes good political leaders and explores the effects of political action on modern societies. On one level it summarizes the political scholarship of one of the founding fathers of social science. On another it reflects a leading German academic and political activist's practical concerns about the future at a time of great volatility following defeat in World War I.