Carl Sagan Explains How the Ancient Greeks, Using Reason and Math, Figured Out the Earth Isn’t Flat, Over 2,000 Years Ago
http://www.openculture.com/?p=1033496 https://t.co/vicnwxGO3T
Carl Sagan Explains How the Ancient Greeks, Using Reason and Math, Figured Out the Earth Isn’t Flat, Over 2,000 Years Ago
http://www.openculture.com/?p=1033496 https://t.co/vicnwxGO3T
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