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Nuclear weapons:
http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html

9 i0 `, S6 l' X: s/ eWeapons of Mass Destruction. (2003). In Harvey Kushner (Ed.), Encyclopedia of Terrorism, Vol. 1. (404-406). Thousand Oaks: Sage Reference. Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>


3 s2 }. L% W9 W/ V  p, TNuclear Weapons. (2006). Encyclopedia of Modern Europe: Europe Since 1914: Encyclopedia of the Age of War and Reconstruction, Vol. 4. (1891-1898). Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
6 k. k! m- q, y1 q4 r% q' O, y<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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, ^& q7 S% s# k6 eClark, Roger. (2005). Nuclear Weapons. In Dinah Shelton (Ed.), Encyclopedia of Genocide and Crimes Against Humanity, Vol. 2. (754-761). Detroit: Macmillan Reference USA. Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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: e0 q7 W# i# @" F" u- kLerner, K. Lee, Gilman, Larry, & Haycock, Dean Allen. (2004). Nuclear Weapons. In K. Lee Lerner & Brenda Lerner (Eds.), Gale Encyclopedia of Science, Vol. 4. (3rd ed., 2816-2821). Detroit: Gale. Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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2 Q! A$ _% p0 C6 F9 N/ Zcritical mass
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2 B3 L$ U9 A9 P. W1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
2 _$ X2 W5 g# `! ^2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
: f% l( M6 b4 |  _- q( b<http://www.thefreedictionary.com/critical+mass>
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