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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 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.

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.

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.

German-born thinker Theodore Levitt's groundbreaking 1960 article Marketing Myopia established him as a world-famous business figure and led to him being dubbed "the father of modern marketing." At the time he published the piece, marketing did not even exist as a separate business discipline. Recognizing that companies went bust when the market for their products dried up, Levitt set to finding out why. He wrote Marketing Myopia as a manifesto.

Friedman did not just demonstrate that monetary policy plays a vital role in broader economic stability. He also argued that economists got their monetary policy wrong in the 1950s and 1960s by misunderstanding the relationship between inflation and unemployment. In Friedman's view, previous generations of economists had no justification for believing that governments could permanently decrease unemployment by allowing inflation - and vice versa.

A self-educated man, Eric Hoffer was most likely born in 1898. He wrote in his spare time after doing shifts on the San Francisco docks, where he continued to work, even after becoming a successful author. Hoffer began writing The True Believer in the 1940s, as Nazism and fascism spread across Europe. Most analysts who were trying to work out how these movements became so powerful focused on their leaders and the ideas they trumpeted.

The title of Norwegian-born historian Odd Arne Westad's 2005 work - The Global Cold War: Third World Interventions and the Making of Our Times - offers a window into his thesis. Between the end of World War II and the early 1990s, both the Soviet Union and the United States "intervened" (or "offered aid and support to") developing nations in Africa, Asia, and Latin America. In Westad's view, these interventions were more important than events in Europe, where most studies of the Cold War focus.

David Graeber's 2011 book, Debt: The First 5,000 Years, seeks to overturn hundreds of years of economic theory, specifically the idea that people have a natural inclination to trade with each other and that the concept of money developed spontaneously to overcome the inefficiencies of a bartering system. The US-born social activist uses his training as an anthropologist to trace the histories of money and of debt and reaches the conclusion that money was in fact created by the state as a means of exploiting the poor.

In his 2007 book The Black Swan, Nassim Nicholas Taleb says the Black Swans of his title can appear at any time, in the form of financial crises, wars, and other unexpected events that have profound, irreversible consequences. Taleb draws on philosophy, mathematics, economics, and other disciplines to explain in plain English why we seldom prepare for these events adequately. The way our brains process knowledge lull us into believing the future will resemble the past.

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.

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.