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Queuing backwards Britons love to queue, but have we been getting it wrong? Lars Peter Osterdal from the University of Southern Denmark discusses his theory of how to make queuing more efficient. Thinking Like an Engineer Engineer Guru Madhavan tells the story of the development of the barcode and argues that those making policy should ask engineers as well as economists about solving social problems. Presenter: Tim Harford Producer: Wesley Stephenson (Photo: Commuters queue for buses Credit: AFP Wires)