So place 6 million tons of granite and limestone in a desert as to form a square-base pyramid. Then place inside as many stone tablets as required, inscribing them with all human knowledge worth saving. Use an otherwise inscrutable language that requires any following civilization reach a certain level of understanding before they are able to recover the knowledge there written.
Justification: it worked before!
(OK, so we haven't found the tablets yet... ;-)
LITL.W/L
Dominic
|