International Education

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.

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.

In his 1996 book The Clash Of Civilizations and the Remaking of World Order, American political scientist Samuel Huntington sets out his vision of the post-Cold War world. While the era from 1945 to 1989 was shaped by ideological conflict (communism vs. capitalism), Huntington predicts a future of cultural conflict.

Born in 1933, Philip Zimbardo is a renowned and controversial American social psychologist who is fascinated by why people can sometimes behave in awful ways. Some psychologists believe people who commit cruelty are innately evil. Zimbardo disagrees. In his 2007 book, The Lucifer Effect, he argued that it is the power of situations around us that can cause otherwise good people to commit "evil", citing many historical examples to illustrate his point.

In the 1960s, British historian Jonathan Riley-Smith first began studying the knightly orders of the Middle Ages that formed after the First Crusade. By the late 1970s, he had begun writing books from a "revisionist" point of view, challenging the common belief that the Crusades were motivated by fanaticism, and were designed to plunder the Holy Lands. To an extent, Riley-Smith's 1986 book The First Crusade and the Idea of Crusading overturned this previously held view.

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.

Based around a Marxist understanding of class struggle, Lefebvre sees the revolution not just as a political crisis, but also as an assault on inherited privilege and the social hierarchy. Ultimately, it succeeded because people at every level of society - from nobles and the elite bourgeois to peasants and the urban masses - found the will to defy the crown. Lefebvre's book was later interpreted by some as simplistic and overly partisan, designed as a rallying call to his fellow countrymen.

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.

In her 1958 article "Modern Moral Philosophy", British philosopher Elizabeth (G. E. M.) Anscombe does nothing less than challenge the very foundations of moral philosophy, the discipline that tries to understand right and wrong action. The article sets out three main ideas. First, that moral philosophy should not be explored until a philosophy of psychology is already in place. Second, that philosophers who do not believe in God should not use ideas about "obligation" and "duty".

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.

How many books can claim to be so influential as to inspire the development of a whole school of thought? The ancient Greek philosopher Aristotle's Metaphysics did exactly that, laying the foundations for a new branch of philosophy - metaphysics - concerned with the cause and nature of being.

Published in 1996, Arjun Appadurai's Modernity at Large is an edited collection of earlier essays that had already made the Indian-born anthropologist an influential figure in his field of cultural anthropology. Appadurai here presents a theory of globalization, and suggests ways that other researchers can follow up on his ideas. Many of them continue to do so. For anthropologists, the book offered new ways of thinking about how communities are affected by globalization.

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.

In his 1936 book The General Theory of Employment, Interest and Money, Keynes argued that traditional economics has misunderstood the causes of unemployment. Employment is not determined by the price of labor; it is directly linked to demand in the economy. Keynes believed market economies are by nature unstable and so require government intervention. Spurred on by the social catastrophe of the Great Depression of the 1930s, Keynes set out to change the way the world thinks about economics.

Under the title "Civil Disobedience", American author Henry David Thoreau's essay was originally published in 1866, four years after his death in 1862. It is based on a lecture, "Resistance to Civil Government", that Thoreau gave many years earlier, in 1848. "Civil Disobedience" asked when an individual should actively oppose a government and its justice system. Thoreau's answer was that opposition was legitimate whenever government actions or institutions were unacceptable to an individual's conscience.

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.

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.

Among the general public, Descartes is probably most famous for his pronouncement "I think, therefore I am." That statement first appeared in an earlier work, but he expands on it in Meditations as he considers the idea of the mind as a separate entity to the body - the "dualist" approach. Descartes also set out to dispel skepticism - the idea that one cannot truly know anything. Using his "methodological skepticism," he showed that by doubting everything, we can know some things beyond doubt.

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.

A work that had a huge influence on great thinkers including celebrated German philosopher Immanuel Kant, An Enquiry is Hume's examination of how we obtain information and form beliefs. He argues that we mainly gain knowledge through our senses, a theory known as empiricism. But while the impressions from our senses are key to our beliefs about the world, Hume argues that reason and facts play only a limited part.