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Tim Harford asks whether there really is a problem with women drink driving as suggested by the Police Federation. He looks at the Rotterdam Effect and asks whether goods going to Europe's largest port skew the UK's export figures. He looks at the number of people on death row in the US who are eventually exonerated. He finds that the number of species of owl is a more difficult number to come by than you might expect and he asks if the Campaign for Real Ale are right to say that 29 pubs a week are closing in the UK.