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

Five ancient technologies that were ahead of their times

Sometimes archaeologists find artifacts so mind-blowing they seem like evidence of lost civilizations or alien visitors. Which ones are misinterpretations or hoaxes, and which are the real thing? » 6/03/10 4:48pm 6/03/10 4:48pm