It often feels like play is a frivolous waste of time, that it's good for kids but inappropriate for adults. But play is how we learn to interact with others, how to create and abide by rules, how to explore our world and ourselves. Play allows any of us - whether kid or adult - to use our imagination, to innovate and create. Even games like Fortnite can be more than just fun. In this episode we talk about the various dimensions of play, from its evolutionary origins to how it affects your brain.