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21 Dec 20

Carl Sagan Explains How the Ancient Greeks, Using Reason and Math, Figured Out the Earth Isn't Flat, Over 2,000 Years Ago / Open Culture

https://openculture.com/2017/03/carl-sagan-explains-how-the-ancient-greeks-figured-out-the-earth-isnt-flat.html
by wyclif 5 years ago
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