I figure I was right with the "genius of how things work", although it pretty much means the same as "genius of mechanics".

IQ is, as far as I know, how many people define genius. I was pointing out that we're discussing something we don't know how to define.

For the record, a high IQ has nothing to do with how a person interacts with the world. It's like having a huge library of books. It doesn't mean a person's read any of them, or arranged them in a pleasing sculptural arrangement. It's about the potential of someone to score highly on a test.

I had an art teacher who, so I HEARD, had scored under a hundred on his IQ test. 100 is average. Maybe he did, but he was/is a brilliant artist, and he was a brilliant teacher. I took two different IQ tests, one oral and one written. I scored 8 points higher one one than the other. I also have ADD, so what happens when a person just reaches their ability to focus on a PITA test? What happens when their eyes get tired, or they're sick so they don't care? Tests are of some value, but aren't the be all/end all. There is no single reliable way to define genius.