Frozen mercury fish. 
A fish made of solid mercury.  Yes, solid mercury: If you cool it with liquid nitrogen, mercury becomes an ordinary solid metal very much like tin. 
Shot by Mike Walker and I for my Popular Science column. 
Source: Theodore Gray 
Contributor: Theodore Gray 
Acquired: 16 April, 2009 
Text Updated: 17 April, 2009 
Price: Donated 
Size: 5" 
Purity: 99%
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