It is a century since Bruno Pontecorvo was born; the first to suggest neutrinos could oscillate between different “flavours”. This provided a solution to what was known as the “solar neutrino problem”, in which the number of neutrinos detected from the sun was much lower than predicted. This session will explore the story of how neutrino oscillations were discovered. We will also look at the modern field of neutrino physics and what this has taught us about the standard model and the origins of neutrino mass.