Even today, some opt for the comforts of mystification, preferring to believe that the wonders of the ancient world were built by Atlanteans, gods, or space travelers, instead of by thousands toiling in the sun. Such thinking robs our forerunners of their due, and us of their experience. Because then one can believe whatever one likes about the past - without having to confront the bones, potsherds, and inscriptions which tell us that people all over the world, time and again, have made similar advances and mistakes.