sentences:  The show's theme was that many inventions which are thought to be modern have ancient roots or in some cases may have been lost and then reinvented.The program was a follow-up to a special originally broadcast in 2005 which focused on technologies from the Ancient Roman era such as the Antikythera mechanism and inventors such as Heron of Alexandria.Episodes of the regular series expanded to cover other areas such as Egypt, China and East Asia, and the Islamic world.