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birdy1976: Read a cool #book: Sizing up the #universe: the #cosmos in perspective by J. Richard Gott & Robert J. Vanderbei http://icio.us/5GKTVo
birdy1976: Read a cool #book: Sizing up the #universe: the #cosmos in perspective by J.
birdy1976: Read a cool #book: Sizing up the #universe: the #cosmos in perspective by J.