  Brazil nuts. 
Brazil nuts (which are not nuts and don't come primarily from Brazil) have an elemental peculiarity: There are extremely high in selenium, even when growing in soil that is not particularly rich in that element.  It is said that a single Brazil nut gives you your daily requirement of selenium (which is admittedly pretty small). 
Source: Walmart 
Contributor: Theodore Gray 
Acquired: 28 February, 2009 
Text Updated: 1 March, 2009 
Price: $3 
Size: 2" 
Purity: 0.003%
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