In this compelling work, renowned cognitive psychologist Steven Pinker delves into the concept of rationality, meticulously exploring what it truly means, why it often appears to be scarce in human decision-making, and why its cultivation is absolutely essential for navigating our complex world. Pinker argues that despite prevalent irrationality, the tools of logic, critical thinking, and sound reasoning are not only accessible but vital for personal well-being and societal progress. He examines various cognitive biases and fallacies, offering profound insights into how we can enhance our rational faculties. This book serves as a timely and powerful call to embrace reason in an era frequently overwhelmed by misinformation and emotional impulses, providing readers with the intellectual framework for clearer, more effective thinking.