A collection of essays examines scientific ideas from a humanistic and aesthetic standpoint, tracing how theories arise, satisfy curiosity, comprehension, and practice, and interact with culture. Subjects range from foundational assumptions, physics, and mathematics to biographies of scientific figures, popularization, amateur observation, and the relation between science and mystery. The author considers scientific method, education, personalities, and the social duties of scientists, arguing that science develops through historical context and serves intellectual, practical, and aesthetic needs while leaving room for unresolved questions.