Most of us know at least one person who's not merely a Mac user, but a dyed-in-the-wool Mac geek. You know the type: someone who has a large collection of Macs and is quick to tell you the history of each one; who keeps up with all the latest Apple news and rumors; and who seems to know the answer to any Mac question, no matter how obscure or technical.Related StoriesRare Matt Groening Apple Mac brochure revealedConfiguring Parental Controls in Mountain Lion