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Our universe appears to stretch nearly thirty billion light years across. Space-time appears unlimited. But once it was thought that the earth was flat - the assumption that space must be infinite may represent a similar bias. Space may not only be curved, as Einstein suggested, but also connected, compact and finite. By searching for the shape and extent of space we are trying to locate ourselves in this vast expanding cosmos. Having studied at MIT and Berkeley, Janna is currently in the Department of Applied Mathematics and Theoretical Physics at Cambridge University. Her diary of unsent letters to her mother has been the popular science 'must read' of 2002.