"Enlightenment Now" is a book by psychologist and author Steven Pinker that argues for the value of reason, science, and humanism in improving the world. Pinker presents data showing that, over time, humanity has made significant progress in areas such as health, wealth, and safety, largely due to Enlightenment principles. The book emphasizes the importance of rational thinking and evidence-based decision-making in addressing global challenges. Pinker encourages readers to embrace optimism and recognize the achievements of modern society, while also acknowledging ongoing issues that require attention and action.