I've taken some classes toward teacher certification. This involved learning about IQs and aptitudes, etc. Which has, of course, made me contemplate the importance of these things. Or the unimportance. Although I am told these tests serve a valid function, only one things makes a person interesting to me and that's curiosity.
Some people have passive curiosity.
That's interesting, tell me more. Others have active curiosity. Speaking as one with active curiosity, this can be as much a curse as a blessing. I don't just think I'd like to learn about something, I delve into any resource I can find to gratify my curiosity. The Internet often provides instant gratification though rarely the depth I require.