Be sure to be sitting down when you read this article from the July 2000 issue of Discover magazine.
http://www.discover.com/issues/jul-00/f
Below are the first and last paragraphs to give you an idea of what the article is about. Although these two paragraphs sound pretty "out there", trust me; all the stuff in between makes you start to wonder…
You do not know what stuff is, you who hold it in your hands. Atoms? Yes, stuff is made of atoms. And every atom is a nucleus orbited by electrons. Every nucleus is built of protons. Every proton is – but there you reach the end of the line. Inside the proton lies the deep, unsettling truth: Stuff is made of nothing, or almost nothing, held together by glue, lots of glue. Physicists first began to suspect this in 1973. Lately it has been proved by experiment.
[…]
The closer you look, the more you find the proton is dissolving into lots of particles, each of which is carrying very, very little energy," says Wilczek. "And the elements of reality that triggered the whole thing, the quarks, are these tiny little things in the middle of the cloud. In fact, if you follow the evolution to infinitely short distances, the triggering charge goes to zero. If you really study the equations, it gets almost mystical.