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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.

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.

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.

Even as recently as the 1920s the historical lack of great female writers was often considered as evidence of women's inferiority. Virginia Woolf disagreed. In her 1929 essay A Room of One's Own, she argues that creativity is impossible without privacy and freedom from financial worries - and that throughout history women have had neither. As a result, no tradition of great female writing existed to inspire women. Woolf's focus on the everyday suppression of women was a turning point.

Austrian-born economist Friedrich Hayek's 1944 work, The Road to Serfdom, analyzes the ways in which excessive government planning can erode democracy. Published while World War II still raged, the work draws influential parallels between the totalitarianism of both socialism and Nazism and increasing control exerted by Western democracies.

This is a book for anyone who wants to understand exactly what we mean by ethics and morality today. One of the most vital and controversial works in the 20th-century world of moral philosophy, Alasdair MacIntyre's After Virtue examines how we think about, talk about, and act out our moral views in the modern world. Finding that the ways in which we engage in our moral reasoning have no common standard of judgment, MacIntyre's 1981 book challenges many contemporary theories of morals.

American lawyer-turned-sociologist David Riesman published his first book, The Lonely Crowd, in 1950. Aimed at academics, it nonetheless gained a large popular audience. In it, Riesman explores the links between social character - the ways in which members of a society are similar to one another - and social structures. Riesman's work popularized sociology, helping to establish it as an academic discipline, and today it provides a fascinating window into the 1950s American psyche.

Though written around 1513, more than 500 years ago, Italian diplomat Niccolò Machiavelli's The Prince is still 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. Given the changeable nature of politics, the strong ruler that Machiavelli describes may need to lie or cheat, deceive and, if necessary, resort to acts of violence - all the while maintaining an "image" of goodness.

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.

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.

History of the Peloponnesian War was the first major work of political inquiry that did not relate events to divine influences. It introduced instead a critical method of looking to the facts of human actions as the basis of our understanding - a method that continues to be used today, more than two millennia later. Many of the most important political thinkers in the Western tradition cite Thucydides as an influence, and major figures including Thomas Hobbes, David Hume, and Friedrich Nietzsche have praised his writing.

When Charles P. Kindleberger's Manias, Panics, and Crashes: A History of Financial Crises was first published in 1978, the world was entering a new period of global economic turbulence. Established economists based their analyses on the assumption that investors act rationally, and these economists often communicated their ideas with dry, technical language. Kindleberger rebelled against convention. Using a more literary and descriptive style, he came up with a new view.

Politics is one of the first books ever to investigate the concept of political philosophy. Written by the famous Greek thinker Aristotle in the fourth century BCE, it focuses on trying to understand how best to create political communities that support, serve, and improve their citizens. Aristotle investigates a number of different areas before drawing conclusions. These include an examination of existing regimes to see which are best, a look at political theories, and even an exploration of the systems of education.

Its arguments would go on to shape global economics and influence world leaders in the late 20th century, but Capitalism and Freedom was largely ignored when it was first published in 1962. The first work written for the general public by American economist Milton Friedman, the book argues that a free market with little government interference is the best way to run society.

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.

An extraordinarily ambitious work, Republic has made important contributions to many branches of modern philosophy. The work unfolds as a series of conversations in which participants set out a number of different theories of justice, and then imagine how these theories might become reality within the political structure of a city. In examining justice, Plato investigates an enormous range of questions in the areas of ethics, politics, and even the nature of existence itself.

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.

Stanley Milgram was a young researcher at Yale in the 1960s when he recruited volunteers to help in a psychology experiment. These volunteers were asked to give electric shocks to "learners" whenever they got an answer to a question wrong. The "learners" were in on the deception, and were not actually receiving shocks, but the volunteers were unaware of this. To widespread surprise, Milgram reported that 40 to 65 percent of his volunteers did what the researcher told them, and gave the maximum shock to the "learners" even when they screamed in pain.

British-born American political activist Thomas Paine wrote Rights of Man in 1791 in response to Reflections on the Revolution in France, Edmund Burke's attack on the French Revolution. Burke was wary of tearing down old institutions of government. But Paine argued that revolution is acceptable - in fact, necessary - when government ignores the rights of its people. Not surprisingly, Rights of Man proved very popular in the newly liberated United States, selling over 100,000 copies.

In his 1997 work Guns, Germs, and Steel, American geography professor and environmental historian Jared Diamond looks to answer the question of why human history unfolded differently on different continents, and why power and wealth became distributed as they are.