Don Stookey knew he had botched the experiment. One day in 1952, the Corning Glass Works chemist placed a sample of photosensitive glass inside a furnace and set the temperature to 600 degrees Celsius. At some point during the run, a faulty controller let the temperature climb to 900 degrees C. Expecting a melted blob of glass and a ruined furnace, Stookey opened the door to discover that, weirdly, his lithium silicate had transformed into a milky white plate. When he tried to remove it, the sample slipped from the tongs and crashed to the floor. Instead of shattering, it bounced.