A bell has been ringing at Oxford for nearly two hundred years. Because no one is willing to stop the bell, and the demonstration that it represents, no one knows the exact mechanism that's making it ring. Learn of the mysteries of the Oxford Electric Bell.
Over at Atlas Obscura, the editors have gathered together an incredible list of the longest-running scientific experiments in history. But we were most intrigued by two mechanical experiments that started during the nineteenth century and never stopped.