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Proving the earth was round over 2,200 years ago. Eratosthenes. Carl Sagan. Cosmos.

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Channel: carlsagandotcom
Categories: Society / Culture   |   Physics   |   Science   |   Social Science  
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Carl Sagan - Cosmos - Eratosthenes.Carl Sagan talks about Eratosthenes, the man who estimated the circumference of the earth using just a stick, eyes, feet and his brains, debunking flat earthers over 2,200 years ago.

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