Half-life - Wikipedia, the free encyclopedia Half-life is the period of time it takes for a substance undergoing decay to decrease by half. ... However, a half-life can also be defined for non-exponential decay processes, ...
Half-Life Gamespy Planet site for all the Half-Life games, Half-Life, Half-Life 2, HL2, HL, Counter-Strike, Day of Deafeat, Team Fortress, Opposing Force, Blue Shift, games, ...
Valve Valve, the Valve logo, Half-Life, the Half-Life logo, the Lambda logo, Steam, the Steam logo, Team Fortress, the Team Fortress logo, Opposing Force, ...