Last Updated Aug 10, 2009 7:22 PM EDT
Even seemingly untouchable companies stumble, and that can lead to a downward spiral. Apple already knows this -- all too well. For the moment though, Apple is getting lots of things right, which you can read about in BNET's latest feature package, The Science Behind Apple's Magic. But just because the company has it together now, doesn't mean something (or some competitor) can't knock Apple down.