This volume explores methods used by social scientists and human biologists to understand fundamental aspects of human experience. It is organized by stages of the human lifespan: beginnings, adulthood, and aging. Explored are particular kinds of experiences - including pain, stress, activity levels, sleep quality, memory, and menopausal hot flashes - that have traditionally relied upon self-reports, but are subject to inter-individual differences in self-awareness or culture-based expectations. The volume also examines other ways in which normally "invisible" phenomena can be made...