Carl Sagan quote about theory from Cosmos - Evolution is a fact, not a theory.
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“ Evolution is a fact, not a theory. ”
 Carl Sagan, Cosmos (1980). copy citation

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Author Carl Sagan
Source Cosmos
Topic theory evolution
Date 1980
Language English
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Carl Sagan quote about theory from Cosmos - Evolution is a fact, not a theory.
Carl Sagan quote about theory from Cosmos - Evolution is a fact, not a theory.