Before anyone here posts their IQ-test results, pulls out their Mensa-membership cards (oh wait, it already happened...) and whatnot, let me say this:
I know some very intelligent people and I know some pretty stupid ones too.
Example 1:
One of my teachers. A very intelligent person who had achieved three doctorates. She failed the mandatory tests which are necessary to obtain a driver's license at least 5 times (that I know of), before she gave up on it. She continues to ride her bicycle.
Example 2:
A woman born with Downs syndrome and therefore probably not very intelligent, managed to get her driver's license and it only took her two attempts.
The tests are basically the same for everyone. I passed all 4 of them (1 regular and 3 special licenses) in the 1st attempt.
So, out of these 3 people, is the most intelligent?
I also know a guy who had lost approximately 1/2 of his skull (and the brain therein) in an accident. After some serious rehab, he can now speak, eat, etc. again. He can even hold a regular job and he can use his computer in his spare time. I probably wouldn't want to have him around 24/7 unless necessary, but all in all, he's just a nice guy who's nice to have around most of the times.
In fact, I'd probably prefer him (or any other "stupid'" person) over anyone who needs to flaunt his Mensa-membership card, IQ-test results and whatnot.
'nother example: On one of my travels, I met the "youngest, most intelligent qualified and practicing medical doctor at that time" (I later confirmed this information and he really was what he had told me). He took me with him for a few hundred miles and we talked about "God, the world and everything".
He drove the worst piece of shit car I've ever seen and I've seen a LOT of piece-of-shit cars. Our conversation about that condensed and paraphrased:
"That incredibly huge rust hole on your left door is big enough to cut anyone's head off, if you ever get involved in an accident."
"I know."
"So why the fuck don't you fix it!"
"I don't know how."
"Fuck! One sheet of sand paper, one square meter of glass fibre, one bottle of epoxy, and, if you want to do a "really good job", 1/2 can of spray paint. 1 hour of work and your car is no longer a danger to society."
"Probably yes, but I don't know how."
"What??? You wouldn't hesitate to cut open, fix and close a human being and you even would be successful with that, but you can't even put a simple patch onto a fucking car door?"
"Yes, because I don't know how."
Message to the ESMB admins: For stories like this, I could really use a huge "facepalm" icon.
Anyway, in the big scheme of things, "intelligence" means less than most people think it does.