The review examines W.E.H. Lecky's book on the rise of rationalism in Europe, praising its scholarship and insights into the gradual shift from medieval to rational thinking. Longer summary

This review discusses W.E.H. Lecky's 'The History of the Rise and Influence of the Spirit of Rationalism in Europe', a book that explores the decline of medieval beliefs and the emergence of rationalism in Europe. The reviewer provides context with an anecdote about a 19th-century 'demonic possession' case, then details Lecky's life and the book's creation. The review outlines the book's main thesis: that rationalism triumphed not through logic, but through gradual social, political, and industrial influences. The reviewer praises the book's scholarship, fascinating facts, and diverse historical figures, recommending it to readers interested in intellectual history. Shorter summary

Scott Alexander explores correlations between PMS symptoms and various beliefs and traits, finding significant connections that leave him puzzled. Longer summary

Scott Alexander discusses survey results related to PMS symptoms and their correlations with various beliefs and traits. He attempts to replicate findings from Aella's Twitter polls, which showed connections between PMS and belief in the supernatural, as well as neuroticism. Using data from the ACX survey, Scott finds significant correlations between PMS symptoms and belief in the supernatural, as well as anxiety levels. He explores potential explanations, including cultural influences and hormonal factors, and presents additional correlations found in the survey data. The post ends with Scott expressing confusion about the findings and inviting readers to replicate his work using the publicly available survey results. Shorter summary

Scott Alexander investigates the prevalence of Hallucinogen Persisting Perceptual Disorder (HPPD) and explores potential connections between perception, cognition, and belief in supernatural phenomena. Longer summary

Scott Alexander explores the prevalence and nature of Hallucinogen Persisting Perceptual Disorder (HPPD), a condition where people experience ongoing visual disturbances after using psychedelics. He discusses results from his own survey, which found that about 12.8% of psychedelic users reported some persisting hallucinations, with 3% still experiencing them. Most cases were mild, involving visual snow, halos, or patterns. Scott then critiques a study claiming HPPD doesn't exist, noting methodological issues. He also considers the possibility that some people naturally experience HPPD-like phenomena without drug use, and speculates on potential links between perception, cognition, and belief in supernatural phenomena. Shorter summary