i use google. period end. in firefox I just hit [Apple]+[K], type what i want, and hit enter, and bam, problem solved. I think it's ctrl K on windows.
I'm a workflow junkie though; I know exactly how to parse things to find stuff in google, when to use quotes, what words to add to what to find stuff, and obviously I know all the key commands to get to what I need faster via the OS.
Also, having wikipedia pop up within the first couple of hits is great when I'm looking for basic information about something I don't know much about.
I'll even go so far as to throw in wikipedia INTO the search terms to get to it faster. (I know in firefox i could scroll down and acually use the wikipedia search, but that's slower.)
For example instead of searching for
[ talking heads ]
(which acually has the wikipedia article as the 2nd hit.)
i'd search for
[ talking heads band wikipedia ]
which brings it up as THE first hit.
This kind of is a shitty example because the talking heads are popular, but for something like nuclear propulsion, it would make getting a general overview easier.......
uhhhhh i seeem to have drifted a little bit but i'm pretty passionate about learning stuff, and as you can see i've gotten pretty good at finding information about things, using google and wikipedia as a launching pad to delve further into topics i find interesting.