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• n  the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)

• half-life

News & Articles

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• Did Valve Tease "Half-Life 3" And "Left For Dead 3" Announcements?
  Half Lifeand "Left for Dead" developer Valve has played on the emotions of gamers before, many of whom have been rendered numb by the fact that it has been years since the last "Half Life" release. For instance, Valve chief Gabe Newell himself responded to a haiku written by a gamer who asked about the development of the next "Half Life" games with a haiku of his own back in 2011.
  Oct. 8, 2013 - International Business Times