Science museums have paradoxes at their core. They must be accessible and fun while representing increasingly complex science. They must be both historic and contemporary. Their exhibits attract millions, but most of their objects remain in deep storage, seldom seen. This book delves into these conflicts, revealing the secret lives of science curators; where science objects come from and who uses them; and, ultimately, what science museums are for. With an insider's eye, Samuel J.M.M. Alberti exposes the idiosyncratic past and intriguing current practice of these institutions, and sets out a map for their future.