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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."

In Philosophical Investigations, the Austrian philosopher Ludwig Wittgenstein presents a radical approach to problems in the philosophy of language and the philosophy of mind. In fact, he sets out a radically new conception of philosophy itself. Published in 1953, two years after Wittgenstein's death, many still consider it one of the finest works of 20th century philosophy.

More than 200 years after Adam Smith published The Wealth of Nations, governments around the world continue to address many of the issues discussed in the book. The most powerful states in the world are still committed to international trade, but questions are repeatedly asked about the role of governments in the economy and the effectiveness of the free market.

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.

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.

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.

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.

Our Common Future is a joint work produced in 1987 by a United Nations commission headed by former Norwegian Prime Minister, Gro Brundtland. Intended to respond to a growing number of environmental concerns faced by the global community, it recognized the need for long-term strategies to manage natural resources. It says we must act collaboratively to protect the environment, while at the same time stimulating economic and social development.

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.

J. A. (John) Hobson's 1902 book, Imperialism: A Study, presents an original and controversial interpretation of the forces that motivated Britain to conquer foreign lands in the 18th century. Hobson advances the idea that ultrawealthy financiers consciously worked to manipulate political leaders, all so they could invest money and sell goods in the outposts of a country's empire.

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.

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.