El legado de Pitágoras: Eratóstenes.
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Cosmos da Cal Sagan
Eratóstenes e a e a circunferência da Terra
http://www.youtube.com/watch?v=0A5k8ahtIC0&feature=share&list=PLUUFEl60UkNAAS4JZ43gEFwtR9Vj9b42V