1:
Half the time it takes for a radioactive substance to decay.
2:
Extreamly popular game, developed by the company VALVe. Yeah, that's how you spell it. With those
capitals and that lower-case e.
The game is extreamly popular, boasting an impressive AI and great graphics (for its time). The mod community made that even better, with one of its best mods, Counter-Strike, being able to go commercial and make a profit. This, in turn, started
getting people to think of the OTHER great mods in the mod community, namely Sven Coop,
Day of Defeat, and The Specialist are all mods that come to mind.
Example:
Damn, this game is huge! I've been playing this since
1998, and it's still fun! Thanks
mod community, and thanks
VALVe!