About time: Why does time's arrow fly only one way?

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Source: http://feeds.newscientist.com/c/749/f/10897/s/1929ff58/l/0L0Snewscientist0N0Carticle0Cmg21128330A0B50A0A0Eabout0Etime0Ewhy0Edoes0Etimes0Earrow0Efly0Eonly0Eone0Eway0Bhtml0DDCMP0FOTC0Erss0Gnsref0Fonline0Enews/story01.htm

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