With age and experience I learned that intelligence has a lot of axis, IQ test is only one of them, it is meaningful but narrow. My favorites questions I like to ask people I know or I don't see often are: what are you passions, what do you like in life? It's often much more interesting about what it reveals of the person, than their ability of solving logic puzzles.
I like to think that Robin Williams was as intelligent as Stephen Hawking, but they both excelled at very different types of information to process and express insight on. Also some of the best athletes in the world are processing information and making decisions in ways those 2 never could.
