As the world wide web turned 25 this week, it's time to take a look at the internet's impressive adoption curve. Back in 1995 just 14 percent of U.S. adults used the internet, by 2005 two thirds did. In 2014, 87 percent of U.S. adults at least occasionally surf the web. As a matter of fact, using the internet has become so normal to us that the real question is: what do the other 13 percent do if they want to look at funny cat videos?