INTPs are the idea mills of the personality world; always examining, always questioning and always musing about some theory. They live in a world of "what if" and possibility. When there's really no answer, INTPs are the most interested.
But often, "what if" is a double-edged sword. On the one hand, it's a clear strength that you're able to keep your options open. You wouldn't be able to philosophize, categorize and objectively analyze the possibilities before you if you made snap decisions based on half the facts.