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
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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 two games do in fact take place in the same world. Though they take place about 10 years apart.
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.
Half-Life 2: Episode Two was supposed to be released on October 9 2007 for Xbox360, Playstation 3 and PC. The development team that worked on Half-Life 2: Episode One was working simultaneously with the team that worked on Half-Life 2: Episode Two so when they were using the same program to develop it, they could fix any bugs that were to appear on each other's progress. Half-Life 2: Episode Two was released for PC and Xbox 360 on October 9 2007 as Valve anounced, but the team that was working on the game for Playstation 3 was working in the UK so they had some issues communicating with the other teams in the US, and so, the release for Half-Life 2: Episode Two for Playstation 3 was delayed a few more months than it should have.
Press esc and go to save game. It's the same as in half-life. I don't think you can save the game when your online if that's what you want to know.