A little rundown on string theory and our universe as told by Brian Greene. The Large Hadron Collider was built and is being used to find and identify, in theory, dark matter. It is called Dark Matter because we aren't exactly sure what it is, we just see it's effects on the universe.

String Theory is some crazy stuff, Basically There are small "Strings" in the center of every particle that vibrate at certain frequencies which result in a Classical Physical breakdown that we interpret as the various elements that make up our world.