How did we discover the Earth wasn't round?
http://dervishcom.blogspot.com/2011/06/how-did-we-discover-earth-wasnt-round.html
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In Measure of the Earth, Larrie Ferreiro recounts the fascinating tale of an equatorial expedition to determine the shape of the planet21 Jun, 2011
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Source: http://feeds.newscientist.com/c/749/f/10897/s/160d7db5/l/0L0Snewscientist0N0Cblogs0Cculturelab0C20A110C0A60Chow0Edid0Ewe0Ediscover0Ethe0Eearth0Ewasnt0Eround0Bhtml0DDCMP0FOTC0Erss0Gnsref0Fonline0Enews/story01.htm
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