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English naturalist and geologist Charles Darwin first published On the Origin of Species in 1859. The idea of evolution and that all earth's species have descended from a common ancestor had already been around for some time. What was new about Darwin's work was that it found a way to explain evolution using a theory called natural selection. This claimed that species change in small ways, gradually, over long periods of time; the individuals who happen to be best suited to their environment survive.

Elizabeth Loftus's 1979 work, Eyewitness Testimony, explains why people sometimes remember events inaccurately, and how this simple fact has a profound impact on the criminal justice system. Eyewitness accounts, which are often used in criminal trials, can be very persuasive to both judges and juries. Yet these accounts are based on memories that are not always reliable, meaning that suspects may be misidentified or wrongfully convicted.

William worked on The Principles of Psychology throughout the 1880s, while teaching psychology and philosophy at Harvard University. He drew together various styles of science to create a unified whole, and to establish psychology as a valid discipline. Not only did he achieve this, but he also created concepts - such as thought being a "stream of consciousness" - that have found their way into both the arts, and popular conversation.

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 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.

Arguing first that what might be termed a morally good action is one that increases the general sum of happiness in the world, Mill then says that general principles of justice should be based on this idea. Therefore, in life, there is no conflict between what is just and what is morally right. Mill published Utilitarianism toward the end of a lifetime spent as a moral philosopher, political activist, and social reformer.

Social anthropologist Edward Evans-Pritchard wrote Witchcraft, Oracles, and Magic Among the Azande after 20 months' fieldwork with the Azande people of the South Sudan. It became the founding text in the anthropology of witchcraft, and has been hailed as a classic. Although Witchcraft had little impact when it first appeared in 1937, its popularity grew after World War II. Alongside his subsequent work on the Nuer people, Witchcraft established Evans-Pritchard's reputation as an important anthropologist.

When American political scientist Francis Fukuyama published The End of History and the Last Man in 1992, Western liberal democracies seemed to have won the Cold War between the United States and the Soviet Union. Fukuyama believed liberal democracy had triumphed for a reason. Any political system containing "fundamental contradictions," he thought, would eventually be replaced by something else. For Fukuyama, communism was such a system.

For the first time, the era's Muslim voices can be heard fully, and their accounts challenge narratives of the Crusades that have been subsequently accepted in the West and the East. Their different understandings of jihad, the often-friendly relations between Muslims and Crusaders, the widespread inter-Arab warfare and near indifference to the invaders' religious beliefs may well surprise listeners. Given today's worldwide political and religious conflicts, interest in the Crusades is greater than ever.

In the century before the Black Death swept across the developed world, economic relations flourished between Europe, the Middle East, and Asia. Before European Hegemony looks at this period. Without any dominant power, the world's economy revolved around eight interlocking sub-systems, with the major world cities and towns playing a crucial role in the system as a whole. But as economic activity spread across borders, so did the Black Death.

Democracy and Its Critics is a modern classic that integrates Robert A. Dahl's democratic thinking as it developed over the course of his academic career. It makes an important contribution to theories about democracy and remains widely cited and debated. Dahl offers an interpretation of democratic theory and practice that is relevant to the modern world and that pays special attention to the problems highlighted by people who criticize democracy.

Having witnessed some negative effects of democratic revolutions in his native France, Tocqueville visited America in 1831 to see what a functioning republic looked like. His main concerns were that democracy could make people too dependent on the state and that minority voices might not be heard - a problem he termed "The Tyranny of the Majority." By examining America thoroughly, Tocqueville hoped to show how a democratic system could avoid these pitfalls.

One of the most influential works of political theory ever written, The Federalist Papers collects 85 essays from 1787 and 1788, when the United States was a new country looking to find its way politically. Thomas Jefferson, author of the country's Declaration of Independence and a future US president, called the work "the best commentary on the principles of government which ever was written".

Ordinary Men is one of the most influential works on the Holocaust. Before US historian Browning's 1992 book, most Holocaust scholarship focused either on the experience of the victims or on the Nazi political ideology driving the slaughter. Browning investigates the stories of some who carried out acts of extreme violence, those who literally had blood on their hands. Who were they? What were their backgrounds? And how could they end up committing such unspeakable acts?

Business scholars C. K. Prahalad and Gary Hamel base their 1990 argument for a strategy change on a comparison of case studies. They note that some corporations are adept at inventing new markets, quickly entering emerging markets, and shifting patterns of customer choice in established markets. The authors suggest that the ability to identify core competencies allows companies to develop new products quickly, and they challenge managers to emulate these best practices

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 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.

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.

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.

Northern Irish academic, novelist, and broadcaster C. S. Lewis' 1943 philosophical work The Abolition of Man is subtitled Reflections on Education with Special Reference to the Teaching of English in the Upper Forms of Schools. It is about the power of education to shape the minds of individuals and improve society (or harm it, if badly done), and encompasses everything from the scientific worldview at the time to philosophical arguments about right and wrong.