In 1975, Kodak began operating a uranium-based research device beneath its Rochester laboratory; 31 years later it shut down, and a new account explains why it was never a self-sustaining nuclear reactor

• Kodak's equipment contained about 3.5 pounds of highly enriched uranium (Representational AP photo)For most people, Kodak is a name associated with cameras and photographic film.
• But for 31 years, the American company had something far less familiar inside its research facility in Rochester, New York: a nuclear device containing highly enriched uranium.
• The machine began operating in 1975 and remained in use until 2006.