When was the last time you spoke to a stranger? In our cities, we barely acknowledge one another on public transport, even as rates of loneliness skyrocket. Online, we carefully curate who we interact with. In our politics, we are increasingly consumed by a fear of people we've never met. But what if strangers, long believed to be the cause of many of our problems, were actually the solution? In 'The Power of Strangers', Joe Keohane discovers the surprising benefits that come from talking to strangers, examining how even passing interactions can enhance empathy, happiness and cognitive development, ease loneliness and isolation, and root us in the world, deepening our sense of belonging.