The idea of a 15-minute city - where all your daily amenities are just a 15-minute walk away - might seem uncontroversial, but the urban planning concept has been twisted into a conspiracy theory. Stephen McDermott, assistant news editor with The Journal, and architect Camilla Siggaard Andersen join us on this week's episode to explain more - how does a 15-minute city work in practice, is there any truth in the idea of 'permits' being used to control movement, and what are the roots of the conspiracy?