On this week's show we have calls from Thomas who has a question about the most liveable cities. Megan asks which map projections we should trust. Ken comes back with a dose of history about GPS. Nicole who asks about which city is a gourmet’s delight and Interview with Matt Brown from The londonist.com the creator of some of the most tweetable maps of the moment. Mark Everden sends in an audio postcard from Avebury.

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