Chris Blattman and Kelsey Piper discuss a range of issues in this fireside chat, including Chris's new book, "Why We Fight". "Why We Fight" draws on decades of economics, political science, psychology, and real-world interventions to synthesize the root causes and remedies for war. From warring states to street gangs, ethnic groups and religious sects to political factions, there are common dynamics across all these levels.  Effective Altruism is a social movement dedicated to finding ways to do the most good possible, whether through charitable donations, career choices, or volunteer projects. EA Global conferences are gatherings for EAs to meet. You can also listen to this talk along with its accompanying video on YouTube.