  Tuna sushi. 
Fish, particularly fatty fish like tuna, tends to contain mercury, largely as a result of contamination from coal burning power plants.  The higher the fat content, the more mercury, and in the case of sushi, the higher the price. 
Source: Nick Mann 
Contributor: Theodore Gray 
Acquired: 13 June, 2009 
Text Updated: 14 June, 2009 
Price: $5 
Size: 2.5" 
Purity: <0.001%
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