Welcome to the third episode of the 21CC podcast, brought to you by the Chartered Institute of Building (CIOB). This month we explore why a line is the worst possible layout for a planned new city in the desert. Pioneering female crane operator Katie Kelleher tells how she started out in construction and explains why women are just as capable. And we visit a construction site using a robot to print plans right on the concrete floor. Digital twins is the topic for this month’s Jargon Buster.