The two games do in fact take place in the same world. Though they take place about 10 years apart.
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Half life is the original game that was created by Valve that made them so rich and big. Half life: Source is the exact same game, but in the Source Engine. The Source Engine is the game engine that games like Team Fortress 2, Half life 2, and Portal use. Half life: Source is also said to have slightly upgraded graphics. It can also be used as content in mods or in Garry's mod.
You can get half-life from a graph by picking two points where the (radio)activity decays to one half its value. The interval of time of those two points is the half-life. You can confirm by picking more points, again with a half (radio)activity value and see that the time is the same in each case.
The price for Portal 2 has not yet been released, but you can expect it to be £49.99 - £39.99; the same as most games.
same as survival mode
No But in terms of the style of play, it can be said that counter strike is a more aggressive or action-packed mod for half life. half life is a first shooting game with exciting story line to play, counter strike is a online first shooting game with multiples rounds of matches between terrorist and counter-terrorist, multiples online players