|Reading for Philosophical Inquiry: A Brief Introduction to Philosophical Thinking ver. 0.21; An Open Source Reader|
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Social Contract The Internet Encyclopedia of Philosophy. A short summary of the history of social contract theory.
Prisoner's Dilemma The Stanford Encyclopedia of Philosophy. An outstanding summary of a variety of characterizations of the philosophical and mathematical aspects of the dilemma.
Opening Pages of the The Selfish Gene The World of Richard Dawkins: Evolution, Science, and Reason. A short excerpt from Richard Dawkin's The Selfish Gene, introducing the biology of egoism and altruism.
The Parthenon, Library of Congress