Everyone should know about this. It allows you to pick your interests and click the "stumble" button, sending you to random webpages according to your interests. Not only is it a great way to kill time, but you can actually learn a lot.
I chose this article because I like to read and keep up with the latest ways to "go green." I ran across tihs article on Stumble Upon.com. It is about a teenager who may have solved a massice environmental problem by speeding up the degrading process of trash. This article just shows that if you put your mind to something, you can come up with something great!