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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.

English historian Christopher Hill turned thinking about the English Civil Wars (1642-51) on its head when he published The World Turned Upside Down in 1972. Instead of focusing on power struggles in the upper echelons of English society - on the battle between the monarchy and would-be republicans - Hill looked to develop "history from below", investigating the lives of ordinary people, the way they saw society, and their political hopes for the future.

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.

More than two centuries after its initial publication in 1781, Immanuel Kant's Critique of Pure Reason remains perhaps the most influential text in modern philosophy. Kant himself claimed his work as a revolutionary document and insisted that it changed the discipline of philosophy as thoroughly as Copernicus had changed astronomy 300 years earlier, when he said the Earth revolved around the sun and not the other way round.

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.

First published in 1651, Leviathan drove important discussions about where kings get their authority to rule and what those kings must, in turn, do for their people. This is known as the "social contract". Thomas Hobbes wrote the book while exiled from his native England following the English Civil War that unseated King Charles I. In the face of England's radical - if temporary - rejection of its monarchy, Hobbes wanted to explain why it was important to have a strong central government, which in his time meant having a sovereign at its head.

In his 2005 book Collapse: How Societies Choose to Fail or Succeed (also subtitled How Societies Choose to Fail or Survive), author and multifaceted US scholar Jared M. Diamond clearly identifies five major factors that he says determine the success or failure of all human societies in all periods of history. Having first asked why societies collapse, Diamond explores various examples of failed societies, from the Norsemen of Scandinavia, who colonized Greenland in the early 10th century, to the 18th-century inhabitants of Easter Island.

In the 1960s, researchers into human memory began to understand memory as operating under two systems. The first was a short-term system handling information for mere seconds. The second was a long-term system capable of managing information indefinitely. They also discovered, however, that short-term memory was not simply a filing cabinet, but was actively working on cognitive - or mental - tasks. This is how the phrase "working memory" developed.

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."

In her original and controversial 2005 book Politics of Piety: The Islamic Revival and the Feminist Subject Saba Mahmood examines the women's mosque movement in Cairo, Egypt as part of a wider turn to religious fervor integral to the broader Islamic revival of the twenty-first century. Mahmood's research suggests that in choosing to embrace the norms of their faith, these pious Muslim women are not limiting, but rather affirming, themselves.

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.

Sociologist Émile Durkheim's 1897 work On Suicide is a powerful evidence-based study of why people take their own lives. In the late 19th century it was generally accepted that each suicide was an individual phenomenon, caused by such personal factors as grief, loss, and financial problems. But Durkheim felt there were patterns in suicide rates, and believed that a more likely cause of suicide lay in the individual's relationship to society.

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.

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.

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.

What is history? In his 2001 book In Defence of History, British historian Richard J. Evans debates the very nature of the subject. Certain thinkers known as postmodernists consider history to be not very far removed from a work of fiction, something based on a scholar's own interpretation of the past. Evans, however, argues that historians do not have free reign. Rather, they are constrained and enabled by the nature of the surviving evidence.

Anthropologist Geert Hofstede's 1980 work, Culture's Consequences, was the first study to look at cultural differences using data. The Dutchman took advantage of the enormous global span of his employer, the technology company IBM, to gather survey data in 20 languages and across 70 countries, and to produce a unique study of national values.

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.

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.

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.