The word "theory" has a number of distinct meanings in different fields of knowledge, depending on the context and their methodologies. In common usage, people use the word "theory" to signify "conjecture", "speculation", or "opinion." In this sense, "theories" are opposed to "facts" — parts of the world, or claims about the world, that are real or true regardless of what people think.
In science, a theory is a proposed description, explanation, or model of the manner of interaction of a set of natural phenomena, capable of predicting future occurrences or observations of the same kind, and capable of being tested through experiment or otherwise falsified through empirical observation. It follows from this that for scientists "theory" and "fact" do not necessarily stand in opposition. For example, it is a fact that an apple dropped on earth has been observed to fall towards the center of the planet, and the theory which explains why the apple behaves so is the current theory of gravitation.
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Political Philosophy :: Political Science

Coercion - Essay denouncing that kulak of libertarianism, coercion.
Meta Description: [ This web deals with principles of LIBERTY, PROPERTY RIGHTS, the LAISSEZ-FAIRE REPUBLIC, & myths of socialism, fascism & ]
en Espanol Commentary Saving the Soul of Classical Liberalism - Reflections by James M. Buchanan.
Freedom's Nest - Libertarian quotes and books. Searchable database.
Meta Description: [ Domain name renewal and affordable web hosting packages from Network Solutions ]
Freedom, Democide, War - Collection of articles, documents, and links arguing for maximum individual liberty as a solution to the world's and history's problems.
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In Defense of Libertarianism - Declan McCullagh and Solveig Singleton rectify common misunderstandings about libertarianism.
Meta Description: [ Wired ]
ISIL Literature Series - More than 50 introductions and overviews of freedom issues.
Key Concepts of Libertarianism - Article by David Boaz of Cato outlining the fundamentals of libertarianism.
Meta Description: [ Promoting an American public policy based on individual liberty, limited government, free markets and peaceful international relations. Extensive library of studies, articles and monographs available ]
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Libertarian Issues Index: Positions and Arguments - Archives of articles sorted by school of thought.
Meta Description: [ Links to Libertarian Positions and Arguments ]
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Libertarian World - A collection of articles on applied libertarian techniques and strategies.
Meta Description: [ A collection of articles on applied libertarian techniques and strategies. ]
Libertarianism.com - Basic information on libertarianism and the libertarian movement.
Libertarianism: A Primer - Chapter excerpts from Boaz's celebrated introduction.
Meta Description: [ Libertarianism: A Primer is a new book by Cato Executive Vice President David Boaz. Libertarianism is an essential guidebook to the libertarian perspective, detailing its
roots, central tenets, solutions to contemporary policy dilemmas, and future in
American politics. He confronts ... ]
Liberty Online - Historical documents from several famous libertarians.
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LibertyHaven.com - Searchable database of articles by theorists like Hazlitt, Rand, and Friedman.
Meta Description: [ Extensive reference library on free-markets, classical economics, and freedom ]
Library of Economics and Liberty - Opinion articles and archives of economic libertarianism.
Meta Description: [ Economics for thought. Library of economics books and articles, encyclopedia, blog, podcasts, and educational resources. Topics include markets, microeconomics, macroeconomics, free trade, economic history, biographies, and political economy. EconLog, with Bryan Caplan and Arnold Kling, and Econ... ]
OnLiberty.Net - Includes Liberty Fundamentals self-study course, John Stuart Mill's On Liberty and Declaration of Independence online texts.
Meta Description: [ Study the fundamental principles of liberty and the freedom philosophy at home with this on-line course and expanding collection of liberty resources and links. ]
Persuasion versus Force - Mark Skousen's essay about a free society.
Political Ideology and Philosophy - The Independent Institute's archive of political articles.
The Essence of Liberty - David F. Nolan presents his five essential libertarian positions.
Meta Description: [ The Essentials of Libertarian Policy. ]
The Online Library of Liberty - Classic texts of liberty online.
Meta Description: [ The Online Library of Liberty is provided in order to encourage the study of the ideal of a society of free and responsible individuals by making freely available on the internet the classic texts in the classical liberal and free market traditions. ]
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The Rise, Decline, and Reemergence of Classical Liberalism - An essay about the history of classical liberalism by Amy H. Sturgis.
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What is libertarianism? - Explanation of libertarianism by the Advocates for Self-Government. Includes a FAQ and essays.
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What is Libertarianism? - A brief sketch about libertarian theory by Joel W. Johnson.
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