Something we do every day? Good question, and I actually not really sure of the answer. My first instinct was no. Most of us certainly do not do it consciously every day. On reflection, though, I suspect that it is something we often do without being aware of it, so the answer might well be yes.
Abstract noun? Yes. *applause*
Curiosity? No.
Does it involve stories? Very often, yes (though it might be more accurate to say that stories can involve it). *some applause*
Susceptible to cause and effect? I'm not exactly sure what you mean, but I think that the only helpful answer is No.
Vowel at the head? Yes.

Sorry this is so tricky. I have scattered a few obscure clues in my answers of the last several days. If the next few questions take you no closer I'll try to think of a better clue.