I reverted s/civilisation/civilization and s/radii/radi, because dictionary.com says both forms of the first are valid English, while the second substitution is invalid. Radii is the plural of radius, while radi is something quite different. Please use a dictionary to double-check your spelling next time. Thank you for contributing.
Vasco Alexandre da Silva Costa 10:21, 11 Jan 2005 (PST)
Wow this article is terrible. Is English even your first language?50.140.92.158 22:50, December 17, 2012 (UTC)