I posted these before, but I like repeating myself.
http://www.scientecmatrix.com/seghers/tecma/scientecmatrix.nsf/_/583A4822C7CA5B3CC1256B9E00354968
http://english.pravda.ru/main/2002/04/11/27547.html
zarkov's dehumidification idea is most likely wrong, because in a dehumidifier you want to expose as much of it to the atmosphere as possible, rather than hope all your air goes into tiny little vents.
I know alot more about the pramids, but it isn't suited to this thread.