The document discusses the development and research of positive psychology. It notes that positive psychology formally began in 1998 with Martin Seligman's presidential address, but that research on positive aspects of life predates World War II. Since then, the field has grown rapidly with numerous conferences and the founding of the Journal of Positive Psychology and the International Positive Psychology Association. The document also summarizes several influential findings from positive psychology research over the last decade relating to optimism, happiness, emotions, life satisfaction, relationships, and money.