You should d/l the demo of the game, Kim. Much fun to be had building experimental rockets to try and reach orbit! 
I know a dangerous time sink when I see one. I think it's best left to EldestCub.
I just mentioned to said Cub that 'some people on the forum have discovered KSP'.
His response is "Awesome!".
He's a fan... although he's just moved on to obsessing about StarMade, which is causing frustration as he can't get it to run on his linux netbook and the graphics card on his brother's WinPC isn't up to it....