Technologies that we've lost - and the quest to find them again

Greek fire. Damascus steel. These are two technological innovations whose secrets are said to be lost to time. Even the original schematics for the Apollo missions have disappeared into the mists of history, forever hidden inside hopelessly obsolete computers. How do we lose technologies that were once so important?… » 2/01/12 9:32am 2/01/12 9:32am