Happy International Pi Day. To celebrate, Hannah Devlin is joined by the mathematician and comedian Matt Parker to discuss maths anxiety, how much today’s world relies on number crunching and what happens when we get it wrong

Happy International Pi Day! On 14 March, the world celebrated this mathematical constant because 3/14 matches the first three digits of pi – 3.14. To mark the occasion, Hannah Devlin invites the mathematician and comedian Matt Parker to talk about Pi, maths and his new book, Humble Pi: A Comedy of Maths Errors. They discuss maths anxiety, how much today’s world relies on number crunching and what happens when we get it wrong.