Booking guests for my new podcast series The Missing Piece has been an absolute revelation. To be honest, I expected it to be a hard sell – I’m not famous, and it’s a new concept – a science-based podcast about community. But if you don’t ask, you don’t get…so, taking a deep breath, I got in touch with Hank Green, who is a god in the world of building online communities.

Almost one in four Australians experience loneliness - it can be as bad for us as smoking. Our need to belong is not being met … and it’s killing us. So, when I heard about how Alex Elliott-Howery was creating community in her Sydney neighbourhood café, I had to find out more.