We all want to see the world clearly. The trouble is, we're never taught how. Join Shane Parrish - 'the former spy who helps Wall Street mavens think smarter' (New York Times) - for a masterclass in the art of clear thinking. Drawing on examples ranging from the evolutionary origins of our 'emotion default' to the secret history of the Challenger disaster, Parrish offers powerful mental models to make sense of any situation. And he reveals a simple, actionable method for smarter decision-making, starting today. Along the way, he shows that the secret to mental clarity lies not in how we approach the most high-stakes moments - but in our tiniest, most everyday decisions. It's a simple idea with startling implications: if you clear your head today, you change your life tomorrow.