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The number 239 in nuclear physics.
edit239 is the atomic mass number of the most common isotope (by far) of the element plutonium, Pu-239,
and this is far more important than any piece of male bovine excrement from "The Simpsons" TV show!98.67.173.16 (talk) 05:19, 5 March 2010 (UTC)
Infobox
editI believe we should use the same format for the infobox for all prime numbers, please comment if you don't feel this should be the case. 174.56.57.138 (talk) 04:35, 19 May 2013 (UTC)