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How to use mathematics to find your life partner, with Matt Parker, author of Things to Make and Do in the Fourth Dimension. And, what are the chances that two friends, given the same due date for their babies' birth, actually do give birth on the same day? Tim discusses the reliability - or otherwise - of pregnancy due dates with professor Jason Gardosi of the Perinatal Institute in the UK. Image: Two people, in symmetry making a heart with their hands, Credit: Thinkstock