Finwe, once you give an explanation to a miracle using scientific terminology it ceases to be a miracle, if you accept that point of view. burrahobbit is right in that respect (as in others, no less
).
zb, I'd call Aragorn an extrovert. Consider his ability to make friends of all kinds and his leadership qualities. But I agree that Frodo and Bilbo are typical introverts. Moreover, so is Niggle, and so is Smith of Wotton Major. I think one can really see a pattern here.