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The Number Four (27 Oct 2003)
Simon Singh's journey begins with the number 4, which for over a century has fuelled one of the most elusive problems in mathematics: is it true that any map can be coloured with just 4 colours so that no two neighbouring countries have the same colour?
Article URL: http://www.bbc.co.uk/radio4/science/another51.shtml
  14.47    (Another 5 Numbers)  

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