i'm not sure about this, but i think that the sum of human knowledge is only about 1% of what is really out there. there was a programme called cosmos fronted by the late great carl sagan, this stated that we did not appear on earth until 23.59 on the 31st dec. there was a hell of a lot of history that went on before that that we are only guessing at what went on. with the advent of technology i believe that we are becoming less cerebral, where are the modern minds that could stand up to the great minds of the past, like the greeks, egyptians, romans and other ancient civilisations as well as newton, einstein et al? there are a lot of events that happen that we have no reasonable explanation for.