Julia Collins has a PhD in 4-dimensional Knot Theory from the University of Edinburgh, where she spent five years as the Mathematics Engagement Officer, with a remit to lecture and spread an appreciation of mathematics. She is now Outreach Officer at the Australian Mathematical Sciences Institute. Julia's writing has been published in Nature and in Princeton University Press' anthology The Best Writing on Mathematics. She is a winner of the How to Talk Maths in Public competition, has been nominated for the London Mathematical Society's Anne Bennett prize, and organised the world's first Maths Craft Festival.