The document summarizes developments in science, art, literature, and popular culture in the aftermath of World War I. Key developments included Sigmund Freud's theories of psychology which helped explain irrational events, Albert Einstein's theories challenging universal principles, and new artistic styles like Surrealism which blended conscious and unconscious elements. In popular culture, new technologies like movies and consumer goods led to changes in leisure activities and tastes as work hours decreased and incomes increased.