Because liquid nitrogen is cold. Very cold.
http://www.popsci.com/popsci/how2/article/0,20967,1022179,00.html
http://www.popsci.com/popsci/how2/article/0,20967,1022179,00.html
http://www.popsci.com/popsci/how2/article/0,20967,1022179,00.html
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My so called life* 
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