A Civilization advance.
In ancient Greece, literacy and an interest in the natural world were common in a burgeoning upper class. These people had leisure time, and they devoted much of it to debate and reasoning. Popular topics for discussion were the principles of thinking and being, logic and mathematics, and the natures of reality and existence. They called the study of thought Philosophy.
Prerequisites: Literacy and Mysticism.
Allows for: The Democracy, Religion, Medicine, University, and Communism.

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