Ed Manley, from CASA, UCL, talks to Thomas Oléron Evans about his work modelling the way that people choose their routes for moving from place to place in a city.

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Ed Manley is a research associate at the Centre for Advanced Spatial Analysis (CASA) at UCL. He specialises in the application of computational techniques to urban systems and works on the MECHANICITY project, investigating the movement of individuals on the London Underground. Read his blog at www.urbanmovements.co.uk or follow him on Twitter @edthink.

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This week's host is Thomas Oléron Evans, doctoral researcher in mathematics at UCL, former secondary teacher and amateur writer. Follow him on Twitter @mathistopheles.