[Eonwe]

i don't think its "magic" per sey. i always thought that "magic" was more mental powers, or that you had a strong will. and men can have both of these. aragorn needed tremendous mental powers to rest the palatir from sauron. denethor was said to be far seeing (something about sight being enhanced or reading the thoughts of men or something.). it seems that men have something of the power of the elves (be that magic, thought, will whatever).