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Alex Bellos is a writer and broadcaster who writes a maths blog and a puzzle blog for the Guardian newspaper. His book Can You Solve my Problems? reveals the story of the puzzle through 125 of the world's best brainteasers. Alex has researched to find out what is the world's favourite number and why we have attachments to certain numbers. Ken Clarke MP, jazz saxophonist Soweto Kinch, historian Melanie Lamotte and Libby Purves share their favourite numbers. First broadcast on Midweek, 16 November 2016.
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