A really funny article by The Economist that discusses the possiblity of an emerging "Moore's Law" of razor blades. Moore's Law, for those of you who don't remember, states that the power of computer chips will double every 18 months, a rule that's held true for a while now. If the "power" rule (think time of developing speeding exponentially) that's trending out over the 5 inagurations of razor blades continues to hold true, we will have 14 blades by the year 2100.
Also note that The Onion predicted the 5 blade razor in a farce article two years ago.