The half-life of a radioactive isotope is the amount of time in which half of a sample of that isotope will decay into another form (either another isotope or a new element). See [radioactive decay]?.
Half-life is also the name of a First person shooter game made by Valve Inc. and published by [Sierra On-line]? in 1998. Has many Mods, the most popular of which is Counter-strike.
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