By most measures, the Internet is still a teenager -- not yet 20 years old.  Of course, Al Gore quibbles with that -- and clearly futurists talked about linking computers in the 70s and the Defense Department funded the research forging the building blocks of the Internet during the 80s. But this new, energetic, strapping creation -- still a teen-ager -- show us so much about our times in its youthful exuberance.  It has the power to save lives by delivering essential knowledge and information to remote and distant places at little...