http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Heliocentric.html
http://www.marxist.com/science-old/mathematicsreflectreality.html
http://goldennumber.net/goldsect.htm
http://www.cut-the-knot.org/language/index.shtml
http://www.geom.uiuc.edu/~demo5337/Group4/
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