When maths mistakes really matter

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Tim Harford talks to mathematically-minded comedian Matt Parker about what happens when maths mistakes are made in the real world. The author of a new book, Humble Pi, reveals how numerical errors have caused major problems for airline pilots and, potentially, a vast number of the world’s computers. Producer: Lizzie McNeill (Two and two make five, an incorrect equation written on a blackboard. Credit: Getty Images)