That smartphone in your pocket is spying on your for … who knows? But it is beaming out information which can be vacuumed up by governments, marketers, or even criminals. We live in a world where our strolls are tracked by CCTV, our travel by smartphones, and our interests by Google and Facebook. But privacy is a human right; we need to defend it, says Carissa Véliz, a Spanish doctoral student at the University of Oxford. A fascinating conversation. Well worth watching.