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

7 H4 o! f: g0 P3 yWeapons 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:
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/ I1 k5 D5 E$ 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:
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) T0 v. R* I( O& kClark, 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:
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Lerner, 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:
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/ C+ h  D' p6 i; r& xcritical mass
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3 f) E- z5 k- p8 T( R6 f8 j  i1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
4 K3 Y1 k! \' M4 E2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
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