In a message dated 1/26/2010 12:15:07 P.M. Eastern Standard Time,  
[log in to unmask] writes:

But it's  definitely a gut job to remove the gypsum blocks, which surely 
have absorbed a  lot of moisture.


Yeah, like, why is this, scientifically?  Why would wetting/drying (or  is 
it just wetting?) destroy the bond of all the little teeny tiny  particles?  
And how did they stick together to begin with?   
 
c

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