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			As I understand this, it's symbolic of maintaining a cairn of rocks on a desert burial, where weathering and critters may derange, and is a tending of the gravesite.  Performing this is accounted a mitzvah.  Doing this for, or with, one's Jewish friends without making any big deal of it will show your suavity and culture.
		 
		
		
		
		
		
		
			
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				Wanna stop school shootings?  End Gun-Free Zones, of course.
			 
		
		
		
		
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